diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6de3b60bb7..2a0a87c302 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -204,6 +204,10 @@ surface.
   of this narrow route until Codewhale supports per-model wire selection
   (#1481 by @seanthefuturegorilla; implementation harvested from PR #773 by
   @zhangweiii and PR #1050 by @sternelee).
+- Add OpenCode Zen as a separate model-aware API-key provider. Its curated
+  model catalog selects Responses, Anthropic Messages, or Chat Completions per
+  model; unsupported Gemini and unknown models fail closed, and Zen missing
+  credentials never fall through to ChatGPT/Codex OAuth guidance.
 - Add TelecomJS TokenHub as a first-class Chat Completions provider with
   `[providers.telecomjs]`, `TELECOMJS_API_KEY`, and a key-scoped live
   `/v1/models` refresh. Models.dev and provider-specific catalogs remain in
diff --git a/config.example.toml b/config.example.toml
index a280620713..92783ba38a 100644
--- a/config.example.toml
+++ b/config.example.toml
@@ -17,11 +17,11 @@
 # `--provider fireworks`, `--provider siliconflow`, `--provider siliconflow-CN`,
 # `/provider arcee`, `/provider moonshot`, `/provider qianfan`, `/provider sglang`, `/provider vllm`,
 # `/provider ollama`, `/provider huggingface`, `/provider stepfun`, `/provider openmodel`,
-# `/provider opencode-go`, `/provider meta`, `/provider xai`) toggle without having to re-enter keys. Top-level
+# `/provider opencode-go`, `/provider opencode-zen`, `/provider meta`, `/provider xai`) toggle without having to re-enter keys. Top-level
 # `api_key` / `base_url` are
 # still read as DeepSeek defaults when `[providers.deepseek]` is absent
 # (backward compatibility).
-provider = "deepseek" # deepseek | deepseek-cn | deepseek-anthropic | nvidia-nim | openai | atlascloud | wanjie-ark | volcengine | openrouter | xiaomi-mimo | novita | fireworks | siliconflow | siliconflow-CN | arcee | moonshot | zai | stepfun | minimax | sglang | vllm | ollama | huggingface | together | qianfan | openai-codex | anthropic | openmodel | deepinfra | sakana | longcat | opencode-go | meta | xai
+provider = "deepseek" # deepseek | deepseek-cn | deepseek-anthropic | nvidia-nim | openai | atlascloud | wanjie-ark | volcengine | openrouter | xiaomi-mimo | novita | fireworks | siliconflow | siliconflow-CN | arcee | moonshot | zai | stepfun | minimax | sglang | vllm | ollama | huggingface | together | qianfan | openai-codex | anthropic | openmodel | deepinfra | sakana | longcat | opencode-go | opencode-zen | meta | xai
 api_key = "YOUR_DEEPSEEK_API_KEY" # must be non-empty
 base_url = "https://api.deepseek.com/beta"
 # provider = "deepseek-cn"                       # legacy alias (official host is still https://api.deepseek.com)
@@ -599,6 +599,20 @@ max_subagents = 10 # optional (1-20)
 # base_url = "https://opencode.ai/zen/go/v1"
 # model = "deepseek-v4-pro"
 
+# OpenCode Zen (https://opencode.ai/docs/zen/)
+# Model-aware gateway: GPT models use Responses, Claude/Qwen use Anthropic
+# Messages, and DeepSeek/MiniMax/GLM/Kimi/Grok/free models use Chat Completions.
+# Gemini uses a Google-specific protocol that Codewhale does not implement and
+# therefore fails closed instead of being sent with the wrong request shape.
+# Env vars: OPENCODE_ZEN_API_KEY (preferred), OPENCODE_API_KEY,
+# OPENCODE_ZEN_BASE_URL, OPENCODE_ZEN_MODEL
+[providers.opencode_zen]
+# api_key = "YOUR_OPENCODE_ZEN_API_KEY"
+# base_url = "https://opencode.ai/zen/v1"
+# model = "gpt-5.5"                         # Responses default
+# model = "claude-sonnet-4-6"               # Anthropic Messages example
+# model = "deepseek-v4-pro"                 # Chat Completions example
+
 # Meta Model API / Muse Spark (https://developer.meta.com/ai/)
 # OpenAI-compatible Chat Completions route.
 # Provider aliases: meta, meta-ai, meta-model-api, muse, muse-spark
diff --git a/crates/app-server/src/chat_completions.rs b/crates/app-server/src/chat_completions.rs
index ce383bbb24..e1c8b1c3d9 100644
--- a/crates/app-server/src/chat_completions.rs
+++ b/crates/app-server/src/chat_completions.rs
@@ -144,7 +144,7 @@ fn resolve_endpoint(
 
     let insecure_skip_tls_verify = provider_cfg.insecure_skip_tls_verify.unwrap_or(false);
 
-    let wire_format = provider_meta.wire();
+    let wire_format = route.protocol();
 
     Ok(ResolvedModelEndpoint {
         provider: provider_kind,
@@ -219,7 +219,11 @@ fn provider_base_url(config: &ConfigToml, provider: ProviderKind) -> String {
 fn endpoint_preserves_raw_model_ids(provider: ProviderKind, base_url: &str) -> bool {
     matches!(
         provider,
-        ProviderKind::Custom | ProviderKind::Ollama | ProviderKind::Vllm | ProviderKind::Sglang
+        ProviderKind::Custom
+            | ProviderKind::Ollama
+            | ProviderKind::Vllm
+            | ProviderKind::Sglang
+            | ProviderKind::OpencodeZen
     ) || provider_preserves_custom_base_url_model(provider, base_url)
 }
 
@@ -926,6 +930,32 @@ api_key = {provider_api_key:?}
         }
     }
 
+    #[test]
+    fn opencode_zen_app_route_uses_the_resolved_model_protocol() {
+        let config = ConfigToml {
+            provider: ProviderKind::OpencodeZen,
+            ..ConfigToml::default()
+        };
+        let registry = ModelRegistry::default();
+
+        for (model, expected) in [
+            ("gpt-5.5", WireFormat::Responses),
+            ("claude-sonnet-4-6", WireFormat::AnthropicMessages),
+            ("deepseek-v4-pro", WireFormat::ChatCompletions),
+        ] {
+            let endpoint = resolve_endpoint(&config, &registry, Some(model))
+                .unwrap_or_else(|error| panic!("{model} should resolve: {error}"));
+            assert_eq!(endpoint.provider, ProviderKind::OpencodeZen);
+            assert_eq!(endpoint.model, model);
+            assert_eq!(endpoint.wire_format, expected);
+        }
+
+        assert!(matches!(
+            resolve_endpoint(&config, &registry, Some("gemini-3.1-pro")),
+            Err(RouteError::UnsupportedModelProtocol { .. })
+        ));
+    }
+
     #[test]
     fn root_auth_and_headers_do_not_bleed_across_inferred_providers() {
         let mut config = ConfigToml {
diff --git a/crates/cli/src/lib.rs b/crates/cli/src/lib.rs
index 11c3e7cd94..1b4cc16891 100644
--- a/crates/cli/src/lib.rs
+++ b/crates/cli/src/lib.rs
@@ -75,6 +75,13 @@ enum ProviderArg {
     LongCat,
     #[value(alias = "opencode_go", alias = "opencodego")]
     OpencodeGo,
+    #[value(
+        alias = "opencode_zen",
+        alias = "opencodezen",
+        alias = "zen",
+        alias = "opencode"
+    )]
+    OpencodeZen,
     #[value(
         alias = "meta-ai",
         alias = "meta_ai",
@@ -120,6 +127,7 @@ impl From<ProviderArg> for ProviderKind {
             ProviderArg::Sakana => ProviderKind::Sakana,
             ProviderArg::LongCat => ProviderKind::LongCat,
             ProviderArg::OpencodeGo => ProviderKind::OpencodeGo,
+            ProviderArg::OpencodeZen => ProviderKind::OpencodeZen,
             ProviderArg::Meta => ProviderKind::Meta,
             ProviderArg::Xai => ProviderKind::Xai,
         }
@@ -5328,6 +5336,19 @@ mod tests {
         }
     }
 
+    #[test]
+    fn opencode_zen_provider_aliases_parse_as_builtin() {
+        for alias in [
+            "opencode-zen",
+            "opencode_zen",
+            "opencodezen",
+            "zen",
+            "opencode",
+        ] {
+            assert_eq!(builtin_provider_arg(alias), Some(ProviderArg::OpencodeZen));
+        }
+    }
+
     #[test]
     fn raw_provider_ids_remain_restricted_to_exec_and_fleet() {
         let cli = parse_ok(&["codewhale", "--provider", "lm-studio", "model", "list"]);
diff --git a/crates/config/src/lib.rs b/crates/config/src/lib.rs
index 49f7e70f1a..447320f503 100644
--- a/crates/config/src/lib.rs
+++ b/crates/config/src/lib.rs
@@ -315,6 +315,15 @@ pub struct ProvidersToml {
         alias = "opencodego"
     )]
     pub opencode_go: ProviderConfigToml,
+    #[serde(
+        default,
+        skip_serializing_if = "ProviderConfigToml::is_empty",
+        alias = "opencode-zen",
+        alias = "opencodezen",
+        alias = "zen",
+        alias = "opencode"
+    )]
+    pub opencode_zen: ProviderConfigToml,
     #[serde(
         default,
         skip_serializing_if = "ProviderConfigToml::is_empty",
@@ -462,6 +471,7 @@ impl ProvidersToml {
             ProviderKind::Sakana => &self.sakana,
             ProviderKind::LongCat => &self.longcat,
             ProviderKind::OpencodeGo => &self.opencode_go,
+            ProviderKind::OpencodeZen => &self.opencode_zen,
             ProviderKind::Meta => &self.meta,
             ProviderKind::Xai => &self.xai,
             ProviderKind::Telecomjs => &self.telecomjs,
@@ -503,6 +513,7 @@ impl ProvidersToml {
             ProviderKind::Sakana => &mut self.sakana,
             ProviderKind::LongCat => &mut self.longcat,
             ProviderKind::OpencodeGo => &mut self.opencode_go,
+            ProviderKind::OpencodeZen => &mut self.opencode_zen,
             ProviderKind::Meta => &mut self.meta,
             ProviderKind::Xai => &mut self.xai,
             ProviderKind::Telecomjs => &mut self.telecomjs,
@@ -2481,6 +2492,7 @@ impl ConfigToml {
                 ProviderKind::Sakana => DEFAULT_SAKANA_BASE_URL.to_string(),
                 ProviderKind::LongCat => DEFAULT_LONGCAT_BASE_URL.to_string(),
                 ProviderKind::OpencodeGo => DEFAULT_OPENCODE_GO_BASE_URL.to_string(),
+                ProviderKind::OpencodeZen => DEFAULT_OPENCODE_ZEN_BASE_URL.to_string(),
                 ProviderKind::Meta => DEFAULT_META_BASE_URL.to_string(),
                 ProviderKind::Xai => DEFAULT_XAI_BASE_URL.to_string(),
                 ProviderKind::Telecomjs => DEFAULT_TELECOMJS_BASE_URL.to_string(),
@@ -3393,6 +3405,7 @@ fn default_model_for_provider(provider: ProviderKind) -> &'static str {
         ProviderKind::Sakana => DEFAULT_SAKANA_MODEL,
         ProviderKind::LongCat => DEFAULT_LONGCAT_MODEL,
         ProviderKind::OpencodeGo => DEFAULT_OPENCODE_GO_MODEL,
+        ProviderKind::OpencodeZen => DEFAULT_OPENCODE_ZEN_MODEL,
         ProviderKind::Meta => DEFAULT_META_MODEL,
         ProviderKind::Xai => DEFAULT_XAI_MODEL,
         ProviderKind::Telecomjs => DEFAULT_TELECOMJS_MODEL,
@@ -3435,6 +3448,7 @@ fn default_base_url_for_provider(provider: ProviderKind) -> &'static str {
         ProviderKind::Sakana => DEFAULT_SAKANA_BASE_URL,
         ProviderKind::LongCat => DEFAULT_LONGCAT_BASE_URL,
         ProviderKind::OpencodeGo => DEFAULT_OPENCODE_GO_BASE_URL,
+        ProviderKind::OpencodeZen => DEFAULT_OPENCODE_ZEN_BASE_URL,
         ProviderKind::Meta => DEFAULT_META_BASE_URL,
         ProviderKind::Xai => DEFAULT_XAI_BASE_URL,
         ProviderKind::Telecomjs => DEFAULT_TELECOMJS_BASE_URL,
@@ -5239,6 +5253,8 @@ struct EnvRuntimeOverrides {
     longcat_model: Option<String>,
     opencode_go_base_url: Option<String>,
     opencode_go_model: Option<String>,
+    opencode_zen_base_url: Option<String>,
+    opencode_zen_model: Option<String>,
     meta_base_url: Option<String>,
     meta_model: Option<String>,
     xai_base_url: Option<String>,
@@ -5511,6 +5527,12 @@ impl EnvRuntimeOverrides {
             opencode_go_model: std::env::var("OPENCODE_GO_MODEL")
                 .ok()
                 .filter(|v| !v.trim().is_empty()),
+            opencode_zen_base_url: std::env::var("OPENCODE_ZEN_BASE_URL")
+                .ok()
+                .filter(|v| !v.trim().is_empty()),
+            opencode_zen_model: std::env::var("OPENCODE_ZEN_MODEL")
+                .ok()
+                .filter(|v| !v.trim().is_empty()),
             meta_base_url: std::env::var("META_MODEL_API_BASE_URL")
                 .ok()
                 .filter(|v| !v.trim().is_empty())
@@ -5593,6 +5615,7 @@ impl EnvRuntimeOverrides {
             ProviderKind::Sakana => self.sakana_base_url.clone(),
             ProviderKind::LongCat => self.longcat_base_url.clone(),
             ProviderKind::OpencodeGo => self.opencode_go_base_url.clone(),
+            ProviderKind::OpencodeZen => self.opencode_zen_base_url.clone(),
             ProviderKind::Meta => self.meta_base_url.clone(),
             ProviderKind::Xai => self.xai_base_url.clone(),
             ProviderKind::Telecomjs => self.telecomjs_base_url.clone(),
@@ -5628,6 +5651,7 @@ impl EnvRuntimeOverrides {
             ProviderKind::Sakana => self.sakana_model.clone(),
             ProviderKind::LongCat => self.longcat_model.clone(),
             ProviderKind::OpencodeGo => self.opencode_go_model.clone(),
+            ProviderKind::OpencodeZen => self.opencode_zen_model.clone(),
             ProviderKind::Meta => self.meta_model.clone(),
             ProviderKind::Xai => self.xai_model.clone(),
             ProviderKind::Telecomjs => self.telecomjs_model.clone(),
diff --git a/crates/config/src/provider.rs b/crates/config/src/provider.rs
index 9de5223879..6e423cbb6c 100644
--- a/crates/config/src/provider.rs
+++ b/crates/config/src/provider.rs
@@ -16,17 +16,17 @@ use super::{
     DEFAULT_NOVITA_MODEL, DEFAULT_NVIDIA_NIM_BASE_URL, DEFAULT_NVIDIA_NIM_MODEL,
     DEFAULT_OLLAMA_BASE_URL, DEFAULT_OLLAMA_MODEL, DEFAULT_OPENAI_BASE_URL,
     DEFAULT_OPENAI_CODEX_BASE_URL, DEFAULT_OPENAI_CODEX_MODEL, DEFAULT_OPENAI_MODEL,
-    DEFAULT_OPENCODE_GO_BASE_URL, DEFAULT_OPENCODE_GO_MODEL, DEFAULT_OPENMODEL_BASE_URL,
-    DEFAULT_OPENMODEL_MODEL, DEFAULT_OPENROUTER_BASE_URL, DEFAULT_OPENROUTER_MODEL,
-    DEFAULT_QIANFAN_BASE_URL, DEFAULT_QIANFAN_MODEL, DEFAULT_SAKANA_BASE_URL, DEFAULT_SAKANA_MODEL,
-    DEFAULT_SGLANG_BASE_URL, DEFAULT_SGLANG_MODEL, DEFAULT_SILICONFLOW_BASE_URL,
-    DEFAULT_SILICONFLOW_CN_BASE_URL, DEFAULT_SILICONFLOW_MODEL, DEFAULT_STEPFUN_BASE_URL,
-    DEFAULT_STEPFUN_MODEL, DEFAULT_TELECOMJS_BASE_URL, DEFAULT_TELECOMJS_MODEL,
-    DEFAULT_TOGETHER_BASE_URL, DEFAULT_TOGETHER_MODEL, DEFAULT_VLLM_BASE_URL, DEFAULT_VLLM_MODEL,
-    DEFAULT_VOLCENGINE_BASE_URL, DEFAULT_VOLCENGINE_MODEL, DEFAULT_WANJIE_ARK_BASE_URL,
-    DEFAULT_WANJIE_ARK_MODEL, DEFAULT_XAI_BASE_URL, DEFAULT_XAI_MODEL,
-    DEFAULT_XIAOMI_MIMO_BASE_URL, DEFAULT_XIAOMI_MIMO_MODEL, DEFAULT_ZAI_BASE_URL,
-    DEFAULT_ZAI_MODEL, ProviderKind,
+    DEFAULT_OPENCODE_GO_BASE_URL, DEFAULT_OPENCODE_GO_MODEL, DEFAULT_OPENCODE_ZEN_BASE_URL,
+    DEFAULT_OPENCODE_ZEN_MODEL, DEFAULT_OPENMODEL_BASE_URL, DEFAULT_OPENMODEL_MODEL,
+    DEFAULT_OPENROUTER_BASE_URL, DEFAULT_OPENROUTER_MODEL, DEFAULT_QIANFAN_BASE_URL,
+    DEFAULT_QIANFAN_MODEL, DEFAULT_SAKANA_BASE_URL, DEFAULT_SAKANA_MODEL, DEFAULT_SGLANG_BASE_URL,
+    DEFAULT_SGLANG_MODEL, DEFAULT_SILICONFLOW_BASE_URL, DEFAULT_SILICONFLOW_CN_BASE_URL,
+    DEFAULT_SILICONFLOW_MODEL, DEFAULT_STEPFUN_BASE_URL, DEFAULT_STEPFUN_MODEL,
+    DEFAULT_TELECOMJS_BASE_URL, DEFAULT_TELECOMJS_MODEL, DEFAULT_TOGETHER_BASE_URL,
+    DEFAULT_TOGETHER_MODEL, DEFAULT_VLLM_BASE_URL, DEFAULT_VLLM_MODEL, DEFAULT_VOLCENGINE_BASE_URL,
+    DEFAULT_VOLCENGINE_MODEL, DEFAULT_WANJIE_ARK_BASE_URL, DEFAULT_WANJIE_ARK_MODEL,
+    DEFAULT_XAI_BASE_URL, DEFAULT_XAI_MODEL, DEFAULT_XIAOMI_MIMO_BASE_URL,
+    DEFAULT_XIAOMI_MIMO_MODEL, DEFAULT_ZAI_BASE_URL, DEFAULT_ZAI_MODEL, ProviderKind,
 };
 
 /// Wire protocol spoken by a provider.
@@ -74,6 +74,43 @@ impl CredentialAcquisition {
     }
 }
 
+/// How a provider selects its request wire format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum WirePolicy {
+    /// Every model served by the provider uses the same wire format.
+    Fixed(WireFormat),
+    /// The provider catalog selects a wire format per model/endpoint.
+    ModelAware,
+}
+
+impl WirePolicy {
+    /// Return the fixed format, or `None` for model-aware providers.
+    #[must_use]
+    pub const fn fixed(self) -> Option<WireFormat> {
+        match self {
+            Self::Fixed(format) => Some(format),
+            Self::ModelAware => None,
+        }
+    }
+
+    /// Resolve a concrete format from an offering endpoint key.
+    #[must_use]
+    pub fn resolve(self, endpoint_key: &str) -> Option<WireFormat> {
+        if let Self::Fixed(format) = self {
+            return Some(format);
+        }
+
+        match endpoint_key.trim().to_ascii_lowercase().as_str() {
+            "chat" | "chat_completions" | "chat-completions" => Some(WireFormat::ChatCompletions),
+            "responses" => Some(WireFormat::Responses),
+            "messages" | "anthropic_messages" | "anthropic-messages" => {
+                Some(WireFormat::AnthropicMessages)
+            }
+            _ => None,
+        }
+    }
+}
+
 /// Canonical, non-secret help for configuring one provider.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct CredentialHelp {
@@ -126,9 +163,9 @@ pub trait Provider: Send + Sync {
         &[]
     }
 
-    /// Wire format used by the provider.
-    fn wire(&self) -> WireFormat {
-        WireFormat::ChatCompletions
+    /// Policy used to select the request wire format.
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::ChatCompletions)
     }
 
     /// Credential acquisition metadata shared by onboarding, setup, diagnostics,
@@ -333,6 +370,12 @@ pub const fn credential_help(kind: ProviderKind) -> CredentialHelp {
             docs_url: Some("https://opencode.ai/docs/go/"),
             guidance: "Create or copy an OpenCode Go subscription key from OpenCode Zen.",
         },
+        ProviderKind::OpencodeZen => CredentialHelp {
+            acquisition: ApiKey,
+            credential_url: Some("https://opencode.ai/zen/"),
+            docs_url: Some("https://opencode.ai/docs/zen/"),
+            guidance: "Create or copy an OpenCode Zen API key from OpenCode Zen.",
+        },
         ProviderKind::Meta => CredentialHelp {
             acquisition: ApiKey,
             credential_url: Some("https://developer.meta.com/ai/"),
@@ -521,8 +564,8 @@ impl Provider for DeepseekAnthropic {
         &["deepseek_anthropic", "deepseek-claude", "deepseek_claude"]
     }
 
-    fn wire(&self) -> WireFormat {
-        WireFormat::AnthropicMessages
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::AnthropicMessages)
     }
 }
 provider!(
@@ -809,8 +852,8 @@ impl Provider for OpenaiCodex {
         ]
     }
 
-    fn wire(&self) -> WireFormat {
-        WireFormat::Responses
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::Responses)
     }
 }
 
@@ -846,8 +889,8 @@ impl Provider for Anthropic {
         "anthropic"
     }
 
-    fn wire(&self) -> WireFormat {
-        WireFormat::AnthropicMessages
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::AnthropicMessages)
     }
 }
 
@@ -887,8 +930,8 @@ impl Provider for Openmodel {
         &["open-model", "open_model"]
     }
 
-    fn wire(&self) -> WireFormat {
-        WireFormat::AnthropicMessages
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::AnthropicMessages)
     }
 }
 
@@ -968,8 +1011,8 @@ impl Provider for MinimaxAnthropic {
         ]
     }
 
-    fn wire(&self) -> WireFormat {
-        WireFormat::AnthropicMessages
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::AnthropicMessages)
     }
 }
 
@@ -1021,6 +1064,47 @@ provider!(
     aliases: ["opencode_go", "opencodego"]
 );
 
+/// OpenCode Zen gateway with a model-scoped wire protocol.
+pub struct OpencodeZen;
+
+impl Provider for OpencodeZen {
+    fn id(&self) -> &'static str {
+        "opencode-zen"
+    }
+
+    fn kind(&self) -> ProviderKind {
+        ProviderKind::OpencodeZen
+    }
+
+    fn display_name(&self) -> &'static str {
+        "OpenCode Zen"
+    }
+
+    fn default_base_url(&self) -> &'static str {
+        DEFAULT_OPENCODE_ZEN_BASE_URL
+    }
+
+    fn default_model(&self) -> &'static str {
+        DEFAULT_OPENCODE_ZEN_MODEL
+    }
+
+    fn env_vars(&self) -> &'static [&'static str] {
+        &["OPENCODE_ZEN_API_KEY", "OPENCODE_API_KEY"]
+    }
+
+    fn provider_config_key(&self) -> &'static str {
+        "opencode_zen"
+    }
+
+    fn aliases(&self) -> &'static [&'static str] {
+        &["opencode_zen", "opencodezen", "zen", "opencode"]
+    }
+
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::ModelAware
+    }
+}
+
 provider!(
     Meta,
     Meta,
@@ -1112,8 +1196,8 @@ impl Provider for Custom {
         "custom"
     }
 
-    fn wire(&self) -> WireFormat {
-        WireFormat::ChatCompletions
+    fn wire_policy(&self) -> WirePolicy {
+        WirePolicy::Fixed(WireFormat::ChatCompletions)
     }
 }
 
@@ -1149,12 +1233,13 @@ static DEEPINFRA: Deepinfra = Deepinfra;
 static SAKANA: Sakana = Sakana;
 static LONGCAT: LongCat = LongCat;
 static OPENCODE_GO: OpencodeGo = OpencodeGo;
+static OPENCODE_ZEN: OpencodeZen = OpencodeZen;
 static META: Meta = Meta;
 static XAI: Xai = Xai;
 static TELECOMJS: Telecomjs = Telecomjs;
 static CUSTOM: Custom = Custom;
 
-static PROVIDER_REGISTRY: [&dyn Provider; 36] = [
+static PROVIDER_REGISTRY: [&dyn Provider; 37] = [
     &DEEPSEEK,
     &DEEPSEEK_ANTHROPIC,
     &NVIDIA_NIM,
@@ -1187,6 +1272,7 @@ static PROVIDER_REGISTRY: [&dyn Provider; 36] = [
     &SAKANA,
     &LONGCAT,
     &OPENCODE_GO,
+    &OPENCODE_ZEN,
     &META,
     &XAI,
     &TELECOMJS,
@@ -1435,6 +1521,26 @@ mod tests {
         );
     }
 
+    #[test]
+    fn model_aware_wire_policy_resolves_only_supported_endpoint_keys() {
+        let policy = WirePolicy::ModelAware;
+        assert_eq!(policy.resolve("chat"), Some(WireFormat::ChatCompletions));
+        assert_eq!(policy.resolve("responses"), Some(WireFormat::Responses));
+        assert_eq!(
+            policy.resolve("messages"),
+            Some(WireFormat::AnthropicMessages)
+        );
+        assert_eq!(policy.resolve("models/gemini-3.1-pro"), None);
+        assert_eq!(policy.resolve(""), None);
+    }
+
+    #[test]
+    fn fixed_wire_policy_ignores_catalog_endpoint_keys() {
+        let policy = WirePolicy::Fixed(WireFormat::Responses);
+        assert_eq!(policy.resolve("chat"), Some(WireFormat::Responses));
+        assert_eq!(policy.resolve("unknown"), Some(WireFormat::Responses));
+    }
+
     #[test]
     fn display_order_is_alphabetical_by_display_name() {
         let display = providers_sorted_for_display();
diff --git a/crates/config/src/provider_defaults.rs b/crates/config/src/provider_defaults.rs
index 36a1641c63..9d27a14b13 100644
--- a/crates/config/src/provider_defaults.rs
+++ b/crates/config/src/provider_defaults.rs
@@ -149,6 +149,12 @@ pub(crate) const OPENCODE_GO_KIMI_K2_6_MODEL: &str = "kimi-k2.6";
 pub(crate) const OPENCODE_GO_DEEPSEEK_V4_FLASH_MODEL: &str = "deepseek-v4-flash";
 pub(crate) const OPENCODE_GO_MIMO_V2_5_MODEL: &str = "mimo-v2.5";
 pub(crate) const OPENCODE_GO_MIMO_V2_5_PRO_MODEL: &str = "mimo-v2.5-pro";
+
+// OpenCode Zen is a model-aware gateway. The default is a documented
+// Responses model, but every executable route must still obtain its protocol
+// from a provider-scoped catalog offering.
+pub(crate) const DEFAULT_OPENCODE_ZEN_MODEL: &str = "gpt-5.5";
+pub(crate) const DEFAULT_OPENCODE_ZEN_BASE_URL: &str = "https://opencode.ai/zen/v1";
 // Meta Model API / Muse Spark defaults
 pub(crate) const DEFAULT_META_MODEL: &str = "muse-spark-1.1";
 pub(crate) const DEFAULT_META_BASE_URL: &str = "https://api.meta.ai/v1";
diff --git a/crates/config/src/provider_kind.rs b/crates/config/src/provider_kind.rs
index 232487f7c6..3110852b82 100644
--- a/crates/config/src/provider_kind.rs
+++ b/crates/config/src/provider_kind.rs
@@ -113,6 +113,13 @@ pub enum ProviderKind {
     LongCat,
     #[serde(alias = "opencode_go", alias = "opencodego")]
     OpencodeGo,
+    #[serde(
+        alias = "opencode_zen",
+        alias = "opencodezen",
+        alias = "zen",
+        alias = "opencode"
+    )]
+    OpencodeZen,
     #[serde(
         alias = "meta-ai",
         alias = "meta_ai",
@@ -147,7 +154,7 @@ pub enum ProviderKind {
 }
 
 impl ProviderKind {
-    pub const ALL: [Self; 36] = [
+    pub const ALL: [Self; 37] = [
         Self::Deepseek,
         Self::DeepseekAnthropic,
         Self::NvidiaNim,
@@ -180,6 +187,7 @@ impl ProviderKind {
         Self::Sakana,
         Self::LongCat,
         Self::OpencodeGo,
+        Self::OpencodeZen,
         Self::Meta,
         Self::Xai,
         Self::Telecomjs,
diff --git a/crates/config/src/route/conformance_tests.rs b/crates/config/src/route/conformance_tests.rs
index a6ee358dcf..1ec903a2cf 100644
--- a/crates/config/src/route/conformance_tests.rs
+++ b/crates/config/src/route/conformance_tests.rs
@@ -57,8 +57,9 @@ fn every_provider_kind_has_a_wellformed_descriptor() {
             );
         }
 
-        // The wire protocol accessor must not panic for any kind.
-        let _ = descriptor.protocol();
+        // Current fixed providers resolve a concrete protocol for their
+        // default endpoint key.
+        let _ = descriptor.protocol_for_endpoint("chat");
     }
 }
 
diff --git a/crates/config/src/route/descriptor.rs b/crates/config/src/route/descriptor.rs
index 72fdea957d..331b333df5 100644
--- a/crates/config/src/route/descriptor.rs
+++ b/crates/config/src/route/descriptor.rs
@@ -10,7 +10,7 @@
 //! inside a `Serialize` struct; serialize the resolved facts instead.
 
 use crate::ProviderKind;
-use crate::provider::{self, Provider};
+use crate::provider::{self, Provider, WirePolicy};
 
 use super::RequestProtocol;
 use super::ids::{ProviderId, WireModelId};
@@ -60,10 +60,16 @@ impl ProviderDescriptor {
         self.inner.env_vars()
     }
 
-    /// Selected wire protocol for this provider.
+    /// Policy used to select this provider's wire protocol.
     #[must_use]
-    pub fn protocol(&self) -> RequestProtocol {
-        self.inner.wire()
+    pub fn wire_policy(&self) -> WirePolicy {
+        self.inner.wire_policy()
+    }
+
+    /// Resolve the concrete protocol for an offering endpoint key.
+    #[must_use]
+    pub fn protocol_for_endpoint(&self, endpoint_key: &str) -> Option<RequestProtocol> {
+        self.wire_policy().resolve(endpoint_key)
     }
 }
 
@@ -72,7 +78,7 @@ impl std::fmt::Debug for ProviderDescriptor {
         f.debug_struct("ProviderDescriptor")
             .field("kind", &self.kind)
             .field("id", &self.inner.id())
-            .field("protocol", &self.inner.wire())
+            .field("wire_policy", &self.inner.wire_policy())
             .finish()
     }
 }
diff --git a/crates/config/src/route/errors.rs b/crates/config/src/route/errors.rs
index 0a052418e4..fbf3a93d23 100644
--- a/crates/config/src/route/errors.rs
+++ b/crates/config/src/route/errors.rs
@@ -23,6 +23,16 @@ pub enum RouteError {
         /// The foreign model selector that was rejected.
         model: String,
     },
+    /// A model-aware provider did not prove a supported request protocol for
+    /// the selected model/endpoint.
+    UnsupportedModelProtocol {
+        /// Provider whose catalog row was incomplete or unsupported.
+        provider: ProviderId,
+        /// Selected provider-owned model id.
+        model: String,
+        /// Catalog endpoint key, when one was present.
+        endpoint_key: String,
+    },
 }
 
 impl fmt::Display for RouteError {
@@ -43,6 +53,15 @@ impl fmt::Display for RouteError {
                 "model {model:?} is not served by direct provider {}",
                 provider.as_str()
             ),
+            Self::UnsupportedModelProtocol {
+                provider,
+                model,
+                endpoint_key,
+            } => write!(
+                f,
+                "model {model:?} on provider {} has unsupported or unproven endpoint {endpoint_key:?}",
+                provider.as_str()
+            ),
         }
     }
 }
diff --git a/crates/config/src/route/offering.rs b/crates/config/src/route/offering.rs
index 10ba04f3a4..95936430b3 100644
--- a/crates/config/src/route/offering.rs
+++ b/crates/config/src/route/offering.rs
@@ -6,11 +6,10 @@
 //! by multiple providers under DIFFERENT wire ids (some aggregator-prefixed),
 //! and a prefix never implies provider ownership.
 //!
-//! The hand-curated seed table is gone (#4139 / #3830 P1): catalog-derived
-//! offerings from [`crate::catalog::bundled_catalog_offerings`] are the single
-//! bundled source of truth. [`bundled_offerings`] remains as an empty seam so
-//! the resolver can still prepend curated overrides later without reintroducing
-//! a parallel seed list.
+//! Catalog-derived offerings from [`crate::catalog::bundled_catalog_offerings`]
+//! remain the general bundled source of truth. [`bundled_offerings`] contains
+//! only transport facts that Models.dev cannot express, such as a single
+//! provider routing different models over different wire protocols.
 
 use serde::{Deserialize, Serialize};
 
@@ -75,13 +74,97 @@ pub struct ProviderModelOffering {
     pub pricing: PricingSku,
 }
 
-/// Return the bundled offering seam as owned [`ProviderModelOffering`] rows.
+// Transport snapshot verified against https://opencode.ai/docs/zen on
+// 2026-07-17. Gemini rows are intentionally absent because they use Google's
+// model-specific wire protocol, which CodeWhale does not currently implement.
+pub(crate) const OPENCODE_ZEN_RESPONSES_MODELS: &[&str] = &[
+    "gpt-5.6-sol",
+    "gpt-5.6-terra",
+    "gpt-5.6-luna",
+    "gpt-5.5",
+    "gpt-5.5-pro",
+    "gpt-5.4",
+    "gpt-5.4-pro",
+    "gpt-5.4-mini",
+    "gpt-5.4-nano",
+    "gpt-5.3-codex",
+    "gpt-5.3-codex-spark",
+    "gpt-5.2",
+    "gpt-5.2-codex",
+    "gpt-5.1",
+    "gpt-5.1-codex",
+    "gpt-5.1-codex-max",
+    "gpt-5.1-codex-mini",
+    "gpt-5",
+    "gpt-5-codex",
+    "gpt-5-nano",
+];
+
+pub(crate) const OPENCODE_ZEN_MESSAGES_MODELS: &[&str] = &[
+    "claude-fable-5",
+    "claude-opus-4-8",
+    "claude-opus-4-7",
+    "claude-opus-4-6",
+    "claude-opus-4-5",
+    "claude-sonnet-5",
+    "claude-sonnet-4-6",
+    "claude-sonnet-4-5",
+    "claude-haiku-4-5",
+    "qwen3.7-max",
+    "qwen3.7-plus",
+    "qwen3.6-plus",
+    "qwen3.5-plus",
+];
+
+pub(crate) const OPENCODE_ZEN_CHAT_MODELS: &[&str] = &[
+    "deepseek-v4-pro",
+    "deepseek-v4-flash",
+    "minimax-m3",
+    "minimax-m2.7",
+    "minimax-m2.5",
+    "glm-5.2",
+    "glm-5.1",
+    "glm-5",
+    "kimi-k2.5",
+    "kimi-k2.6",
+    "kimi-k2.7-code",
+    "grok-4.5",
+    "grok-build-0.1",
+    "big-pickle",
+    "mimo-v2.5-free",
+    "north-mini-code-free",
+    "nemotron-3-ultra-free",
+    "deepseek-v4-flash-free",
+];
+
+/// Return curated provider/model transport facts as owned offering rows.
 ///
-/// Empty by design: every former hand-seed row is covered by the bundled
-/// Models.dev catalog ([`crate::catalog::bundled_catalog_offerings`]), which
-/// carries the same canonical-model joins via `base_model` plus honest limits
-/// and pricing the old seeds lacked (#4139 / #3830 P1 OFFERING_SEEDS dedupe).
+/// OpenCode Zen's official catalog serves models over three protocol families.
+/// These rows intentionally carry no inferred limits, pricing, or canonical
+/// identity: their sole claim is the documented wire model and endpoint key.
 #[must_use]
 pub fn bundled_offerings() -> Vec<ProviderModelOffering> {
-    Vec::new()
+    let provider = ProviderId::from("opencode-zen");
+    let groups = [
+        ("responses", OPENCODE_ZEN_RESPONSES_MODELS),
+        ("messages", OPENCODE_ZEN_MESSAGES_MODELS),
+        ("chat", OPENCODE_ZEN_CHAT_MODELS),
+    ];
+
+    groups
+        .into_iter()
+        .flat_map(|(endpoint_key, models)| {
+            let provider = provider.clone();
+            models.iter().map(move |model| ProviderModelOffering {
+                provider: provider.clone(),
+                canonical_model: None,
+                wire_model_id: WireModelId::from(*model),
+                endpoint_key: endpoint_key.to_string(),
+                default_for_provider: *model == "gpt-5.5",
+                limits: RouteLimits::default(),
+                capabilities: RouteCapabilities::default(),
+                pricing: PricingSku::UnknownOrStale,
+            })
+        })
+        .collect()
 }
diff --git a/crates/config/src/route/resolver.rs b/crates/config/src/route/resolver.rs
index 5b78afdef1..3d2226db77 100644
--- a/crates/config/src/route/resolver.rs
+++ b/crates/config/src/route/resolver.rs
@@ -37,6 +37,7 @@ use super::errors::RouteError;
 use super::ids::{LogicalModelRef, ModelId, ProviderId, WireModelId};
 use super::offering::{ProviderModelOffering, RouteLimits, bundled_offerings};
 use crate::catalog::{CatalogOffering, bundled_catalog_offerings};
+use crate::provider::WirePolicy;
 use crate::{ProviderKind, opencode_go_chat_model_id, provider_preserves_custom_base_url_model};
 
 /// A request to resolve into an executable route.
@@ -188,17 +189,27 @@ impl RouteResolver {
         } else {
             classify(provider_kind)
         };
+        let model_aware = descriptor.wire_policy() == WirePolicy::ModelAware;
         let mut selected = if is_auto {
-            default_offering.map_or_else(
-                || {
-                    // No offering in hand on the default branch: capability
-                    // and pricing facts are honestly unknown.
-                    ResolvedOffering::unknown(descriptor.default_wire_model())
-                },
-                ResolvedOffering::from_offering,
-            )
+            match default_offering {
+                None if model_aware => {
+                    return Err(RouteError::UnsupportedModelProtocol {
+                        provider: provider_id.clone(),
+                        model: descriptor.default_wire_model().as_str().to_string(),
+                        endpoint_key: "unproven".to_string(),
+                    });
+                }
+                None => ResolvedOffering::unknown(descriptor.default_wire_model()),
+                Some(offering) => ResolvedOffering::from_offering(offering),
+            }
         } else {
-            self.scope_selector(provider_kind, &provider_id, &logical_model, class)?
+            self.scope_selector(
+                provider_kind,
+                &provider_id,
+                &logical_model,
+                class,
+                model_aware,
+            )?
         };
         if custom_endpoint {
             // A documented first-party server tool is an endpoint-owned fact.
@@ -208,13 +219,20 @@ impl RouteResolver {
                 super::capabilities::CapabilityState::Unknown;
         }
 
+        let protocol = descriptor
+            .protocol_for_endpoint(&selected.endpoint_key)
+            .ok_or_else(|| RouteError::UnsupportedModelProtocol {
+                provider: provider_id.clone(),
+                model: selected.wire_model_id.as_str().to_string(),
+                endpoint_key: selected.endpoint_key.clone(),
+            })?;
         let endpoint = ResolvedEndpoint {
             base_url: req
                 .base_url_override
                 .clone()
                 .unwrap_or_else(|| descriptor.default_base_url().to_string()),
             endpoint_key: selected.endpoint_key,
-            protocol: descriptor.protocol(),
+            protocol,
         };
 
         // Advisory validation (#1519): a non-loopback `http://` endpoint sends
@@ -250,7 +268,7 @@ impl RouteResolver {
             // The resolver never inspects credentials: auth is honestly
             // `Unresolved` at resolution time, not a claimed `Missing`.
             ResolvedAuthSource::Unresolved,
-            descriptor.protocol(),
+            protocol,
             limits,
             selected.capabilities,
             // #3085: honest pricing projected from the matched offering (the
@@ -269,6 +287,7 @@ impl RouteResolver {
         provider_id: &ProviderId,
         logical_model: &LogicalModelRef,
         class: ProviderClass,
+        require_catalog_match: bool,
     ) -> Result<ResolvedOffering, RouteError> {
         // OpenCode Go publishes one combined model roster across two wire
         // protocols. Codewhale's provider is deliberately Chat Completions
@@ -282,6 +301,12 @@ impl RouteResolver {
                     model: logical_model.raw().to_string(),
                 }
             })?
+        } else if provider_kind == ProviderKind::OpencodeZen {
+            logical_model
+                .raw()
+                .strip_prefix("opencode/")
+                .or_else(|| logical_model.raw().strip_prefix("opencode-zen/"))
+                .unwrap_or_else(|| logical_model.raw())
         } else {
             provider_scoped_wire_alias(provider_kind, logical_model.raw(), class)
         };
@@ -303,6 +328,22 @@ impl RouteResolver {
             }
         }
 
+        if require_catalog_match {
+            return Err(RouteError::UnsupportedModelProtocol {
+                provider: provider_id.clone(),
+                model: raw.to_string(),
+                endpoint_key: "unproven".to_string(),
+            });
+        }
+
+        if require_catalog_match {
+            return Err(RouteError::UnsupportedModelProtocol {
+                provider: provider_id.clone(),
+                model: raw.to_string(),
+                endpoint_key: "unproven".to_string(),
+            });
+        }
+
         // No catalog match. Apply class-specific pass-through rules.
         match class {
             ProviderClass::StrictDirect => {
@@ -395,9 +436,8 @@ fn provider_scoped_wire_alias(
 
 /// Build the default resolver offerings from the bundled Models.dev asset.
 ///
-/// [`bundled_offerings`] is an empty override seam (#4139): when it later gains
-/// curated rows again, those win a `(provider, wire id)` collision over the
-/// asset. Today the asset is the sole bundled source of truth.
+/// Curated transport rows win a `(provider, wire id)` collision over the asset;
+/// all other offerings continue to come from Models.dev.
 fn default_offerings() -> Vec<ProviderModelOffering> {
     let mut seen: std::collections::HashSet<(String, String)> = std::collections::HashSet::new();
     let mut out = Vec::new();
diff --git a/crates/config/src/route/tests.rs b/crates/config/src/route/tests.rs
index 2bdd8a2b08..9b4fecf547 100644
--- a/crates/config/src/route/tests.rs
+++ b/crates/config/src/route/tests.rs
@@ -264,8 +264,11 @@ fn descriptor_for_every_kind_has_nonempty_transport_facts() {
             !d.default_wire_model().as_str().is_empty(),
             "{kind:?} default_wire_model empty"
         );
-        // protocol() always yields a RequestProtocol; calling it must not panic.
-        let _: RequestProtocol = d.protocol();
+        if d.wire_policy().fixed().is_some() {
+            let _: RequestProtocol = d
+                .protocol_for_endpoint("chat")
+                .expect("fixed provider protocol");
+        }
     }
 }
 
@@ -273,20 +276,41 @@ fn descriptor_for_every_kind_has_nonempty_transport_facts() {
 fn descriptor_protocol_matches_provider_wire() {
     for kind in ProviderKind::ALL {
         let d = ProviderDescriptor::for_kind(kind);
+        if kind == ProviderKind::OpencodeZen {
+            assert_eq!(d.wire_policy(), crate::provider::WirePolicy::ModelAware);
+            assert_eq!(
+                d.protocol_for_endpoint("chat"),
+                Some(RequestProtocol::ChatCompletions)
+            );
+            assert_eq!(
+                d.protocol_for_endpoint("responses"),
+                Some(RequestProtocol::Responses)
+            );
+            assert_eq!(
+                d.protocol_for_endpoint("messages"),
+                Some(RequestProtocol::AnthropicMessages)
+            );
+            assert_eq!(d.protocol_for_endpoint("models/gemini"), None);
+            continue;
+        }
         assert_eq!(
-            d.protocol(),
-            kind.provider().wire(),
-            "{kind:?} protocol must equal provider().wire()"
+            d.protocol_for_endpoint("chat"),
+            kind.provider().wire_policy().fixed(),
+            "{kind:?} protocol must equal the provider wire policy"
         );
         let expected = match kind {
-            ProviderKind::OpenaiCodex => RequestProtocol::Responses,
+            ProviderKind::OpenaiCodex => Some(RequestProtocol::Responses),
             ProviderKind::DeepseekAnthropic
             | ProviderKind::Anthropic
             | ProviderKind::MinimaxAnthropic
-            | ProviderKind::Openmodel => RequestProtocol::AnthropicMessages,
-            _ => RequestProtocol::ChatCompletions,
+            | ProviderKind::Openmodel => Some(RequestProtocol::AnthropicMessages),
+            _ => Some(RequestProtocol::ChatCompletions),
         };
-        assert_eq!(d.protocol(), expected, "{kind:?} protocol mismatch");
+        assert_eq!(
+            d.protocol_for_endpoint("chat"),
+            expected,
+            "{kind:?} protocol mismatch"
+        );
     }
 }
 
@@ -877,6 +901,83 @@ fn opencode_go_resolver_rejects_messages_models_even_on_custom_base_urls() {
     }
 }
 
+#[test]
+fn opencode_zen_resolver_selects_protocol_from_documented_model_catalog() {
+    use super::offering::{
+        OPENCODE_ZEN_CHAT_MODELS, OPENCODE_ZEN_MESSAGES_MODELS, OPENCODE_ZEN_RESPONSES_MODELS,
+    };
+
+    let resolver = RouteResolver::new();
+    let groups = [
+        (
+            OPENCODE_ZEN_RESPONSES_MODELS,
+            "responses",
+            RequestProtocol::Responses,
+        ),
+        (
+            OPENCODE_ZEN_MESSAGES_MODELS,
+            "messages",
+            RequestProtocol::AnthropicMessages,
+        ),
+        (
+            OPENCODE_ZEN_CHAT_MODELS,
+            "chat",
+            RequestProtocol::ChatCompletions,
+        ),
+    ];
+
+    for (models, endpoint_key, protocol) in groups {
+        for model in models {
+            for requested in [model.to_string(), format!("opencode/{model}")] {
+                let route = resolver
+                    .resolve(&req(Some(ProviderKind::OpencodeZen), Some(&requested)))
+                    .unwrap_or_else(|error| panic!("{requested} should resolve: {error}"));
+                assert_eq!(route.provider_kind(), ProviderKind::OpencodeZen);
+                assert_eq!(route.wire_model_id().as_str(), *model, "{requested}");
+                assert_eq!(route.endpoint().endpoint_key, endpoint_key, "{requested}");
+                assert_eq!(route.protocol(), protocol, "{requested}");
+            }
+        }
+    }
+
+    let automatic = resolver
+        .resolve(&req(Some(ProviderKind::OpencodeZen), Some("auto")))
+        .expect("OpenCode Zen auto should resolve to its documented default");
+    assert_eq!(automatic.wire_model_id().as_str(), "gpt-5.5");
+    assert_eq!(automatic.protocol(), RequestProtocol::Responses);
+}
+
+#[test]
+fn opencode_zen_resolver_fails_closed_for_unproven_protocols() {
+    let resolver = RouteResolver::new();
+
+    for model in [
+        "gemini-3.1-pro",
+        "opencode/gemini-3.5-flash",
+        "unknown-model",
+    ] {
+        for base_url_override in [
+            None,
+            Some("https://zen-gateway.example.test/v1".to_string()),
+        ] {
+            let request = RouteRequest {
+                explicit_provider: Some(ProviderKind::OpencodeZen),
+                model_selector: Some(LogicalModelRef::from(model)),
+                saved_provider_model: None,
+                base_url_override,
+                limit_overrides: Vec::new(),
+            };
+            assert!(
+                matches!(
+                    resolver.resolve(&request),
+                    Err(RouteError::UnsupportedModelProtocol { .. })
+                ),
+                "{model} must fail closed without a supported protocol mapping"
+            );
+        }
+    }
+}
+
 #[test]
 fn resolver_deepseek_none_selector_uses_default_wire_id() {
     let r = RouteResolver::new();
@@ -972,7 +1073,9 @@ fn resolver_protocol_matches_descriptor_for_every_provider() {
             .unwrap_or_else(|e| panic!("{kind:?} should resolve its own default: {e}"));
         assert_eq!(
             out.protocol(),
-            ProviderDescriptor::for_kind(kind).protocol(),
+            ProviderDescriptor::for_kind(kind)
+                .protocol_for_endpoint(&out.endpoint().endpoint_key)
+                .expect("resolved endpoint protocol"),
             "{kind:?} candidate protocol must match descriptor"
         );
         assert_eq!(
diff --git a/crates/config/src/tests.rs b/crates/config/src/tests.rs
index 7ca7891e58..9e7b06c5b5 100644
--- a/crates/config/src/tests.rs
+++ b/crates/config/src/tests.rs
@@ -994,6 +994,10 @@ struct EnvGuard {
     opencode_go_api_key: Option<OsString>,
     opencode_go_base_url: Option<OsString>,
     opencode_go_model: Option<OsString>,
+    opencode_zen_api_key: Option<OsString>,
+    opencode_api_key: Option<OsString>,
+    opencode_zen_base_url: Option<OsString>,
+    opencode_zen_model: Option<OsString>,
     meta_model_api_key: Option<OsString>,
     model_api_key: Option<OsString>,
     meta_model_api_base_url: Option<OsString>,
@@ -1026,6 +1030,10 @@ impl EnvGuard {
             opencode_go_api_key: env::var_os("OPENCODE_GO_API_KEY"),
             opencode_go_base_url: env::var_os("OPENCODE_GO_BASE_URL"),
             opencode_go_model: env::var_os("OPENCODE_GO_MODEL"),
+            opencode_zen_api_key: env::var_os("OPENCODE_ZEN_API_KEY"),
+            opencode_api_key: env::var_os("OPENCODE_API_KEY"),
+            opencode_zen_base_url: env::var_os("OPENCODE_ZEN_BASE_URL"),
+            opencode_zen_model: env::var_os("OPENCODE_ZEN_MODEL"),
             meta_model_api_key: env::var_os("META_MODEL_API_KEY"),
             model_api_key: env::var_os("MODEL_API_KEY"),
             meta_model_api_base_url: env::var_os("META_MODEL_API_BASE_URL"),
@@ -1151,6 +1159,10 @@ impl EnvGuard {
             env::remove_var("OPENCODE_GO_API_KEY");
             env::remove_var("OPENCODE_GO_BASE_URL");
             env::remove_var("OPENCODE_GO_MODEL");
+            env::remove_var("OPENCODE_ZEN_API_KEY");
+            env::remove_var("OPENCODE_API_KEY");
+            env::remove_var("OPENCODE_ZEN_BASE_URL");
+            env::remove_var("OPENCODE_ZEN_MODEL");
             env::remove_var("META_MODEL_API_KEY");
             env::remove_var("MODEL_API_KEY");
             env::remove_var("META_MODEL_API_BASE_URL");
@@ -1299,6 +1311,10 @@ impl Drop for EnvGuard {
             Self::restore_var("OPENCODE_GO_API_KEY", self.opencode_go_api_key.take());
             Self::restore_var("OPENCODE_GO_BASE_URL", self.opencode_go_base_url.take());
             Self::restore_var("OPENCODE_GO_MODEL", self.opencode_go_model.take());
+            Self::restore_var("OPENCODE_ZEN_API_KEY", self.opencode_zen_api_key.take());
+            Self::restore_var("OPENCODE_API_KEY", self.opencode_api_key.take());
+            Self::restore_var("OPENCODE_ZEN_BASE_URL", self.opencode_zen_base_url.take());
+            Self::restore_var("OPENCODE_ZEN_MODEL", self.opencode_zen_model.take());
             Self::restore_var("META_MODEL_API_KEY", self.meta_model_api_key.take());
             Self::restore_var("MODEL_API_KEY", self.model_api_key.take());
             Self::restore_var(
@@ -3073,12 +3089,12 @@ fn load_project_config_keeps_unknown_provider_names_strict() {
     fs::create_dir_all(&config_dir).expect("mkdir project config");
     fs::write(
         config_dir.join(CONFIG_FILE_NAME),
-        r#"provider = "opencode_zen"
+        r#"provider = "acme_zen_gateway"
 model = "must-not-apply"
 
-[providers.opencode_zen]
+[providers.acme_zen_gateway]
 kind = "openai-compatible"
-base_url = "https://opencode.example/v1"
+base_url = "https://acme.example/v1"
 "#,
     )
     .expect("write project config");
@@ -3093,7 +3109,7 @@ base_url = "https://opencode.example/v1"
         .map(|(path, reason)| (path.to_path_buf(), reason.to_string()))
         .expect("unknown provider must report why the config was rejected");
     assert!(path.ends_with(CONFIG_FILE_NAME), "{path:?}");
-    assert!(reason.contains("opencode_zen"), "{reason}");
+    assert!(reason.contains("acme_zen_gateway"), "{reason}");
 }
 
 #[test]
@@ -3883,23 +3899,23 @@ fn config_store_preserves_named_custom_provider_identity_across_typed_dispatch_r
     fs::write(
         &path,
         r#"# written by the TUI custom-provider flow
-provider = "opencode_zen"
+provider = "acme_zen_gateway"
 
-[providers.opencode_zen]
+[providers.acme_zen_gateway]
 kind = "openai-compatible"
-base_url = "https://opencode.example/v1"
+base_url = "https://acme.example/v1"
 model = "deepseek-v4-flash-free"
-api_key_env = "OPENCODE_ZEN_API_KEY"
+api_key_env = "ACME_ZEN_GATEWAY_API_KEY"
 "#,
     )
     .expect("custom provider fixture");
 
     let mut store = ConfigStore::load(Some(path.clone())).expect("dispatcher config should load");
     assert_eq!(store.config.provider, ProviderKind::Custom);
-    assert_eq!(store.config.provider_id(), "opencode_zen");
+    assert_eq!(store.config.provider_id(), "acme_zen_gateway");
     assert_eq!(
         store.config.get_value("provider").as_deref(),
-        Some("opencode_zen")
+        Some("acme_zen_gateway")
     );
     assert_eq!(
         store
@@ -3907,7 +3923,7 @@ api_key_env = "OPENCODE_ZEN_API_KEY"
             .list_values()
             .get("provider")
             .map(String::as_str),
-        Some("opencode_zen")
+        Some("acme_zen_gateway")
     );
 
     let resolved = store
@@ -3915,7 +3931,7 @@ api_key_env = "OPENCODE_ZEN_API_KEY"
         .resolve_runtime_options(&CliRuntimeOverrides::default());
     assert_eq!(resolved.provider, ProviderKind::Custom);
     assert_eq!(resolved.provider_source, ProviderSource::Config);
-    assert_eq!(resolved.base_url, "https://opencode.example/v1");
+    assert_eq!(resolved.base_url, "https://acme.example/v1");
     assert_eq!(resolved.model, "deepseek-v4-flash-free");
 
     store
@@ -3926,7 +3942,7 @@ api_key_env = "OPENCODE_ZEN_API_KEY"
         .rendered_body()
         .expect("render custom provider config");
     assert!(
-        rendered.contains("provider = \"opencode_zen\""),
+        rendered.contains("provider = \"acme_zen_gateway\""),
         "{rendered}"
     );
     assert!(!rendered.contains("provider = \"custom\""), "{rendered}");
@@ -3934,18 +3950,18 @@ api_key_env = "OPENCODE_ZEN_API_KEY"
 
     store.save().expect("save custom provider config");
     let reloaded = ConfigStore::load(Some(path)).expect("reload custom provider config");
-    assert_eq!(reloaded.config.provider_id(), "opencode_zen");
+    assert_eq!(reloaded.config.provider_id(), "acme_zen_gateway");
 }
 
 #[test]
 fn named_custom_root_provider_requires_a_matching_openai_compatible_table() {
     for body in [
-        "provider = \"opencode_zen\"\n",
-        r#"provider = "opencode_zen"
+        "provider = \"acme_zen_gateway\"\n",
+        r#"provider = "acme_zen_gateway"
 
-[providers.opencode_zen]
+[providers.acme_zen_gateway]
 kind = "anthropic-messages"
-base_url = "https://opencode.example/v1"
+base_url = "https://acme.example/v1"
 "#,
     ] {
         let dir = tempfile::tempdir().expect("tempdir");
@@ -3953,7 +3969,7 @@ base_url = "https://opencode.example/v1"
         fs::write(&path, body).expect("invalid custom provider fixture");
         let err = ConfigStore::load(Some(path)).expect_err("invalid custom route should fail");
         let message = format!("{err:#}");
-        assert!(message.contains("opencode_zen"), "{message}");
+        assert!(message.contains("acme_zen_gateway"), "{message}");
         assert!(message.contains("openai-compatible") || message.contains("matching"));
     }
 }
@@ -4004,7 +4020,10 @@ fn deepseek_anthropic_route_defaults_to_anthropic_endpoint() {
         DEFAULT_DEEPSEEK_ANTHROPIC_BASE_URL
     );
     assert_eq!(provider.env_vars(), &["DEEPSEEK_API_KEY"]);
-    assert_eq!(provider.wire(), provider::WireFormat::AnthropicMessages);
+    assert_eq!(
+        provider.wire_policy().fixed(),
+        Some(provider::WireFormat::AnthropicMessages)
+    );
 
     let config = ConfigToml {
         provider: ProviderKind::DeepseekAnthropic,
@@ -4047,7 +4066,10 @@ fn openmodel_route_defaults_to_messages_endpoint() {
     assert_eq!(provider.default_model(), DEFAULT_OPENMODEL_MODEL);
     assert_eq!(provider.default_base_url(), DEFAULT_OPENMODEL_BASE_URL);
     assert_eq!(provider.env_vars(), &["OPENMODEL_API_KEY"]);
-    assert_eq!(provider.wire(), provider::WireFormat::AnthropicMessages);
+    assert_eq!(
+        provider.wire_policy().fixed(),
+        Some(provider::WireFormat::AnthropicMessages)
+    );
 
     let config = ConfigToml {
         provider: ProviderKind::Openmodel,
@@ -4121,7 +4143,10 @@ fn opencode_go_resolves_current_chat_completions_route() {
     assert_eq!(metadata.default_base_url(), DEFAULT_OPENCODE_GO_BASE_URL);
     assert_eq!(metadata.default_model(), DEFAULT_OPENCODE_GO_MODEL);
     assert_eq!(metadata.env_vars(), &["OPENCODE_GO_API_KEY"]);
-    assert_eq!(metadata.wire(), provider::WireFormat::ChatCompletions);
+    assert_eq!(
+        metadata.wire_policy().fixed(),
+        Some(provider::WireFormat::ChatCompletions)
+    );
 
     let config: ConfigToml = toml::from_str(
         r#"
@@ -4206,7 +4231,10 @@ fn telecomjs_resolves_key_scoped_chat_completions_route() {
     assert_eq!(metadata.default_base_url(), DEFAULT_TELECOMJS_BASE_URL);
     assert_eq!(metadata.default_model(), DEFAULT_TELECOMJS_MODEL);
     assert_eq!(metadata.env_vars(), &["TELECOMJS_API_KEY"]);
-    assert_eq!(metadata.wire(), provider::WireFormat::ChatCompletions);
+    assert_eq!(
+        metadata.wire_policy(),
+        provider::WirePolicy::Fixed(provider::WireFormat::ChatCompletions)
+    );
 
     let config: ConfigToml = toml::from_str(
         r#"
@@ -4248,6 +4276,63 @@ model = "glm-5.2"
     assert_eq!(resolved.api_key_source, Some(RuntimeApiKeySource::Env));
 }
 
+#[test]
+fn opencode_zen_configures_model_aware_provider_with_catalog_proof() {
+    let _lock = env_lock();
+    let _env = EnvGuard::without_deepseek_runtime_overrides();
+    for alias in [
+        "opencode-zen",
+        "opencode_zen",
+        "opencodezen",
+        "zen",
+        "opencode",
+    ] {
+        assert_eq!(ProviderKind::parse(alias), Some(ProviderKind::OpencodeZen));
+    }
+
+    let metadata = provider::resolve_provider("opencode_zen").expect("Zen provider metadata");
+    assert_eq!(metadata.id(), "opencode-zen");
+    assert_eq!(metadata.display_name(), "OpenCode Zen");
+    assert_eq!(metadata.provider_config_key(), "opencode_zen");
+    assert_eq!(metadata.default_base_url(), DEFAULT_OPENCODE_ZEN_BASE_URL);
+    assert_eq!(metadata.default_model(), DEFAULT_OPENCODE_ZEN_MODEL);
+    assert_eq!(
+        metadata.env_vars(),
+        &["OPENCODE_ZEN_API_KEY", "OPENCODE_API_KEY"]
+    );
+    assert_eq!(metadata.wire_policy(), provider::WirePolicy::ModelAware);
+
+    let config: ConfigToml = toml::from_str(
+        r#"
+provider = "opencode-zen"
+
+[providers.opencode_zen]
+api_key = "zen-config-key"
+base_url = "https://zen-gateway.example/v1"
+model = "gpt-5.5"
+"#,
+    )
+    .expect("OpenCode Zen provider table");
+    let resolved = config.resolve_runtime_options(&CliRuntimeOverrides::default());
+    assert_eq!(resolved.provider, ProviderKind::OpencodeZen);
+    assert_eq!(resolved.base_url, "https://zen-gateway.example/v1");
+    assert_eq!(resolved.model, "gpt-5.5");
+    assert_eq!(resolved.api_key.as_deref(), Some("zen-config-key"));
+
+    let resolver = crate::route::RouteResolver::new();
+    let route = resolver
+        .resolve(&crate::route::RouteRequest {
+            explicit_provider: Some(ProviderKind::OpencodeZen),
+            model_selector: Some(crate::route::LogicalModelRef::from("gpt-5.5")),
+            saved_provider_model: None,
+            base_url_override: None,
+            limit_overrides: Vec::new(),
+        })
+        .expect("documented Zen model must resolve");
+    assert_eq!(route.protocol(), crate::route::RequestProtocol::Responses);
+    assert_eq!(route.endpoint().endpoint_key, "responses");
+}
+
 #[test]
 fn meta_model_api_scopes_both_documented_key_names_to_official_endpoint() {
     let _lock = env_lock();
@@ -4391,14 +4476,15 @@ fn provider_metadata_defaults_match_runtime_helpers() {
         // Anthropic-compatible routes speak the native Messages API; every
         // other built-in provider is OpenAI-compatible Chat Completions.
         let expected_wire = match kind {
-            ProviderKind::OpenaiCodex => provider::WireFormat::Responses,
+            ProviderKind::OpencodeZen => None,
+            ProviderKind::OpenaiCodex => Some(provider::WireFormat::Responses),
             ProviderKind::Anthropic
             | ProviderKind::DeepseekAnthropic
             | ProviderKind::MinimaxAnthropic
-            | ProviderKind::Openmodel => provider::WireFormat::AnthropicMessages,
-            _ => provider::WireFormat::ChatCompletions,
+            | ProviderKind::Openmodel => Some(provider::WireFormat::AnthropicMessages),
+            _ => Some(provider::WireFormat::ChatCompletions),
         };
-        assert_eq!(provider.wire(), expected_wire);
+        assert_eq!(provider.wire_policy().fixed(), expected_wire);
     }
 }
 
diff --git a/crates/secrets/src/lib.rs b/crates/secrets/src/lib.rs
index 429618cbb2..9cf27ee02b 100644
--- a/crates/secrets/src/lib.rs
+++ b/crates/secrets/src/lib.rs
@@ -1083,6 +1083,9 @@ pub fn env_for(name: &str) -> Option<String> {
         "sakana" | "sakana-ai" | "sakana_ai" | "fugu" => &["FUGU_API_KEY", "SAKANA_API_KEY"],
         "longcat" | "long-cat" | "meituan-longcat" | "meituan" => &["LONGCAT_API_KEY"],
         "opencode-go" | "opencode_go" | "opencodego" => &["OPENCODE_GO_API_KEY"],
+        "opencode-zen" | "opencode_zen" | "opencodezen" | "zen" | "opencode" => {
+            &["OPENCODE_ZEN_API_KEY", "OPENCODE_API_KEY"]
+        }
         "meta" | "meta-ai" | "meta_ai" | "meta-model-api" | "meta_model_api" | "muse"
         | "muse-spark" => &["META_MODEL_API_KEY", "MODEL_API_KEY"],
         "xai" | "x-ai" | "x_ai" | "grok" => &["XAI_API_KEY"],
@@ -1144,6 +1147,8 @@ mod tests {
             "SAKANA_API_KEY",
             "LONGCAT_API_KEY",
             "OPENCODE_GO_API_KEY",
+            "OPENCODE_ZEN_API_KEY",
+            "OPENCODE_API_KEY",
             "META_MODEL_API_KEY",
             "MODEL_API_KEY",
             "XAI_API_KEY",
@@ -1649,6 +1654,25 @@ mod tests {
         clear_known_envs();
     }
 
+    #[test]
+    fn opencode_zen_env_aliases_resolve() {
+        let _guard = env_lock();
+        clear_known_envs();
+        unsafe { std::env::set_var("OPENCODE_ZEN_API_KEY", "zen-key") };
+
+        for alias in [
+            "opencode-zen",
+            "opencode_zen",
+            "opencodezen",
+            "zen",
+            "opencode",
+        ] {
+            assert_eq!(env_for(alias).as_deref(), Some("zen-key"), "{alias}");
+        }
+
+        clear_known_envs();
+    }
+
     #[test]
     fn meta_model_api_env_aliases_resolve() {
         let _guard = env_lock();
diff --git a/crates/tui/CHANGELOG.md b/crates/tui/CHANGELOG.md
index 7026393d9f..41d79a9913 100644
--- a/crates/tui/CHANGELOG.md
+++ b/crates/tui/CHANGELOG.md
@@ -204,6 +204,10 @@ surface.
   of this narrow route until Codewhale supports per-model wire selection
   (#1481 by @seanthefuturegorilla; implementation harvested from PR #773 by
   @zhangweiii and PR #1050 by @sternelee).
+- Add OpenCode Zen as a separate model-aware API-key provider. Its curated
+  model catalog selects Responses, Anthropic Messages, or Chat Completions per
+  model; unsupported Gemini and unknown models fail closed, and Zen missing
+  credentials never fall through to ChatGPT/Codex OAuth guidance.
 - Add TelecomJS TokenHub as a first-class Chat Completions provider with
   `[providers.telecomjs]`, `TELECOMJS_API_KEY`, and a key-scoped live
   `/v1/models` refresh. Models.dev and provider-specific catalogs remain in
diff --git a/crates/tui/src/client.rs b/crates/tui/src/client.rs
index 8e0672a747..84b854c300 100644
--- a/crates/tui/src/client.rs
+++ b/crates/tui/src/client.rs
@@ -21,7 +21,7 @@ use codewhale_config::catalog::{
     ProviderCatalogCache, ProviderCatalogDelta, base_url_fingerprint, now_unix,
 };
 use codewhale_config::provider::WireFormat;
-use codewhale_config::route::ReadyRouteCandidate;
+use codewhale_config::route::{LogicalModelRef, ReadyRouteCandidate, RouteRequest, RouteResolver};
 use codewhale_config::{auth_mode_disables_api_key, is_upstream_auth_header};
 
 use crate::config::{
@@ -954,7 +954,18 @@ fn add_extra_root_certs(
 impl DeepSeekClient {
     /// Create a DeepSeek client from CLI configuration.
     pub fn new(config: &Config) -> Result<Self> {
-        Self::from_parts(config.deepseek_base_url(), config.default_model(), config)
+        let api_provider = config.api_provider();
+        if api_provider == ApiProvider::OpencodeZen {
+            let route = crate::route_runtime::resolve_runtime_route(config, api_provider, None)
+                .map_err(anyhow::Error::msg)?;
+            return Self::from_candidate(&route.config, &route.candidate);
+        }
+        Self::from_parts(
+            config.deepseek_base_url(),
+            config.default_model(),
+            provider_default_wire_format(api_provider),
+            config,
+        )
     }
 
     /// Create a DeepSeek client whose transport is bound to a runtime-resolved
@@ -967,15 +978,12 @@ impl DeepSeekClient {
     /// an auth-source *class*), so the API key and provider are still read from
     /// `config`.
     pub fn from_candidate(config: &Config, candidate: &ReadyRouteCandidate) -> Result<Self> {
-        let mut client = Self::from_parts(
+        Self::from_parts(
             candidate.endpoint().base_url.clone(),
             candidate.wire_model_id().as_str().to_string(),
+            candidate.protocol(),
             config,
-        )?;
-        // #185: dispatch the wire format from the resolved route offering,
-        // not from the provider enum.
-        client.wire_format = candidate.protocol();
-        Ok(client)
+        )
     }
 
     /// Shared constructor body for [`Self::new`] and [`Self::from_candidate`].
@@ -983,7 +991,12 @@ impl DeepSeekClient {
     /// `base_url` and `default_model` are the only inputs that differ between
     /// the two entry points; everything else (auth, provider, retry, headers,
     /// timeouts) is derived from `config` so the two paths cannot drift.
-    fn from_parts(base_url: String, default_model: String, config: &Config) -> Result<Self> {
+    fn from_parts(
+        base_url: String,
+        default_model: String,
+        wire_format: WireFormat,
+        config: &Config,
+    ) -> Result<Self> {
         let api_provider = config.api_provider();
         if api_provider == ApiProvider::OpencodeGo {
             validate_route(api_provider, &default_model).map_err(anyhow::Error::msg)?;
@@ -1051,6 +1064,7 @@ impl DeepSeekClient {
             &http_headers,
             api_provider,
             &base_url,
+            wire_format,
             auth_disabled,
             false,
         )?;
@@ -1062,18 +1076,11 @@ impl DeepSeekClient {
             &http_headers,
             api_provider,
             &base_url,
+            wire_format,
             auth_disabled,
             true,
         )?;
 
-        let wire_format = if api_provider == ApiProvider::OpenaiCodex {
-            WireFormat::Responses
-        } else if api_provider_uses_anthropic_messages(api_provider) {
-            WireFormat::AnthropicMessages
-        } else {
-            WireFormat::ChatCompletions
-        };
-
         Ok(Self {
             http_client,
             http1_client,
@@ -1147,6 +1154,32 @@ impl DeepSeekClient {
         redact_model_bound_text(text, &self.model_bound_secret_values)
     }
 
+    fn bind_request_to_protocol(&self, mut request: MessageRequest) -> Result<MessageRequest> {
+        if self.api_provider != ApiProvider::OpencodeZen {
+            return Ok(request);
+        }
+
+        let candidate = RouteResolver::new()
+            .resolve(&RouteRequest {
+                explicit_provider: ApiProvider::OpencodeZen.kind(),
+                model_selector: Some(LogicalModelRef::from(request.model.as_str())),
+                saved_provider_model: None,
+                base_url_override: Some(self.base_url.clone()),
+                limit_overrides: Vec::new(),
+            })
+            .map_err(anyhow::Error::msg)?;
+        if candidate.protocol() != self.wire_format {
+            bail!(
+                "OpenCode Zen model {:?} uses {:?}, but this client is bound to {:?}; resolve a new model route before sending",
+                request.model,
+                candidate.protocol(),
+                self.wire_format
+            );
+        }
+        request.model = candidate.wire_model_id().as_str().to_string();
+        Ok(request)
+    }
+
     #[cfg(test)]
     fn build_http_client(
         api_key: &str,
@@ -1159,6 +1192,7 @@ impl DeepSeekClient {
             extra_headers,
             api_provider,
             base_url,
+            provider_default_wire_format(api_provider),
             false,
             false,
         )
@@ -1169,6 +1203,7 @@ impl DeepSeekClient {
         extra_headers: &HashMap<String, String>,
         api_provider: ApiProvider,
         base_url: &str,
+        wire_format: WireFormat,
         auth_disabled: bool,
         force_http1: bool,
     ) -> Result<reqwest::Client> {
@@ -1177,6 +1212,7 @@ impl DeepSeekClient {
             extra_headers,
             api_provider,
             base_url,
+            wire_format,
             auth_disabled,
         )?;
         let mut builder = crate::tls::reqwest_client_builder()
@@ -1218,6 +1254,7 @@ impl DeepSeekClient {
             extra_headers,
             ApiProvider::Deepseek,
             crate::config::DEFAULT_DEEPSEEK_BASE_URL,
+            WireFormat::ChatCompletions,
             false,
         )
     }
@@ -1229,7 +1266,14 @@ impl DeepSeekClient {
         api_provider: ApiProvider,
         base_url: &str,
     ) -> Result<HeaderMap> {
-        build_default_headers(api_key, extra_headers, api_provider, base_url, false)
+        build_default_headers(
+            api_key,
+            extra_headers,
+            api_provider,
+            base_url,
+            provider_default_wire_format(api_provider),
+            false,
+        )
     }
 
     #[cfg(test)]
@@ -1239,7 +1283,14 @@ impl DeepSeekClient {
         api_provider: ApiProvider,
         base_url: &str,
     ) -> Result<HeaderMap> {
-        build_default_headers(api_key, extra_headers, api_provider, base_url, true)
+        build_default_headers(
+            api_key,
+            extra_headers,
+            api_provider,
+            base_url,
+            provider_default_wire_format(api_provider),
+            true,
+        )
     }
 }
 
@@ -1248,12 +1299,14 @@ fn build_default_headers(
     extra_headers: &HashMap<String, String>,
     api_provider: ApiProvider,
     base_url: &str,
+    wire_format: WireFormat,
     auth_disabled: bool,
 ) -> Result<HeaderMap> {
     let mut headers = HeaderMap::new();
     headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
     let api_key = api_key.trim();
-    if api_provider_uses_anthropic_messages(api_provider) {
+    let uses_anthropic_messages = wire_format == WireFormat::AnthropicMessages;
+    if uses_anthropic_messages {
         // #3014: most Messages API routes authenticate with `x-api-key`.
         // OpenModel also supports Bearer auth for Messages, and its `/models`
         // endpoint requires it, so the header chooser below keeps OpenModel on
@@ -1266,7 +1319,7 @@ fn build_default_headers(
     let auth_header_name = if auth_disabled {
         None
     } else if !api_key.is_empty()
-        && api_provider_uses_anthropic_messages(api_provider)
+        && uses_anthropic_messages
         && api_provider != ApiProvider::Openmodel
     {
         Some(HeaderName::from_static("x-api-key"))
@@ -1317,14 +1370,21 @@ fn is_auth_dialect_header(header_name: &HeaderName) -> bool {
         || header_name == HeaderName::from_static("x-api-key")
 }
 
-fn api_provider_uses_anthropic_messages(api_provider: ApiProvider) -> bool {
-    matches!(
-        api_provider,
-        ApiProvider::Anthropic
-            | ApiProvider::DeepseekAnthropic
-            | ApiProvider::MinimaxAnthropic
-            | ApiProvider::Openmodel
-    )
+fn provider_default_wire_format(api_provider: ApiProvider) -> WireFormat {
+    api_provider
+        .kind()
+        .and_then(|kind| {
+            codewhale_config::provider::provider_for_kind(kind)
+                .wire_policy()
+                .fixed()
+        })
+        .unwrap_or_else(|| {
+            if api_provider == ApiProvider::OpencodeZen {
+                WireFormat::Responses
+            } else {
+                WireFormat::ChatCompletions
+            }
+        })
 }
 
 fn api_provider_skips_models_probe(api_provider: ApiProvider) -> bool {
@@ -1354,8 +1414,15 @@ pub async fn verify_provider_api_key(
         // way; accept the key optimistically (same as health_check).
         return Ok(());
     }
-    let headers = build_default_headers(api_key, &Default::default(), provider, base_url, false)
-        .map_err(|err| format!("failed to build auth headers: {err:#}"))?;
+    let headers = build_default_headers(
+        api_key,
+        &Default::default(),
+        provider,
+        base_url,
+        provider_default_wire_format(provider),
+        false,
+    )
+    .map_err(|err| format!("failed to build auth headers: {err:#}"))?;
     let client = crate::tls::reqwest_client_builder()
         .default_headers(headers)
         .user_agent(concat!(
@@ -1541,10 +1608,17 @@ impl DeepSeekClient {
         target_language: &str,
     ) -> Result<String> {
         let model = wire_model_for_provider_route(self.api_provider, &self.base_url, model);
-        if self.wire_format == WireFormat::AnthropicMessages {
-            let response = self
-                .handle_anthropic_message(translation_message_request(text, model, target_language))
-                .await?;
+        if self.wire_format != WireFormat::ChatCompletions {
+            let request = self.bind_request_to_protocol(translation_message_request(
+                text,
+                model,
+                target_language,
+            ))?;
+            let response = match self.wire_format {
+                WireFormat::Responses => self.handle_responses_message(request).await?,
+                WireFormat::AnthropicMessages => self.handle_anthropic_message(request).await?,
+                WireFormat::ChatCompletions => unreachable!(),
+            };
             return translation_text_from_response(&response);
         }
 
@@ -2116,7 +2190,7 @@ impl LlmClient for DeepSeekClient {
 
     async fn create_message(&self, request: MessageRequest) -> Result<MessageResponse> {
         let _permit = self.acquire_provider_request_permit().await;
-        let request = self.prepare_model_bound_request(request);
+        let request = self.bind_request_to_protocol(self.prepare_model_bound_request(request))?;
         match self.wire_format {
             WireFormat::Responses => self.handle_responses_message(request).await,
             WireFormat::AnthropicMessages => self.handle_anthropic_message(request).await,
@@ -2129,7 +2203,7 @@ impl LlmClient for DeepSeekClient {
         request: MessageRequest,
     ) -> Result<crate::llm_client::StreamEventBox> {
         let permit = self.acquire_provider_request_permit().await;
-        let request = self.prepare_model_bound_request(request);
+        let request = self.bind_request_to_protocol(self.prepare_model_bound_request(request))?;
         let stream = match self.wire_format {
             WireFormat::Responses => self.handle_responses_stream(request).await?,
             WireFormat::AnthropicMessages => self.handle_anthropic_stream(request).await?,
@@ -2582,7 +2656,7 @@ pub(super) fn apply_reasoning_effort(
             ApiProvider::Stepfun => {}
             ApiProvider::Sakana => {}
             ApiProvider::LongCat => {}
-            ApiProvider::OpencodeGo => {}
+            ApiProvider::OpencodeGo | ApiProvider::OpencodeZen => {}
             ApiProvider::Meta => {}
             ApiProvider::Xai => {}
         },
@@ -2680,7 +2754,7 @@ pub(super) fn apply_reasoning_effort(
             ApiProvider::Stepfun => {}
             ApiProvider::Sakana => {}
             ApiProvider::LongCat => {}
-            ApiProvider::OpencodeGo => {}
+            ApiProvider::OpencodeGo | ApiProvider::OpencodeZen => {}
             ApiProvider::Meta => {}
             ApiProvider::Xai => {}
         },
@@ -2758,7 +2832,7 @@ pub(super) fn apply_reasoning_effort(
             ApiProvider::Stepfun => {}
             ApiProvider::Sakana => {}
             ApiProvider::LongCat => {}
-            ApiProvider::OpencodeGo => {}
+            ApiProvider::OpencodeGo | ApiProvider::OpencodeZen => {}
             ApiProvider::Meta => {}
             ApiProvider::Xai => {}
         },
@@ -2846,10 +2920,13 @@ impl DeepSeekClient {
         suffix: &str,
         max_tokens: u32,
     ) -> anyhow::Result<String> {
-        if self.wire_format == WireFormat::AnthropicMessages {
+        if self.api_provider == ApiProvider::OpencodeZen
+            || self.wire_format != WireFormat::ChatCompletions
+        {
             bail!(
-                "FIM completion is not supported for {} because it uses the Anthropic Messages protocol",
-                self.api_provider.display_name()
+                "FIM completion is not supported for {} because the route has no proven FIM wire contract ({:?})",
+                self.api_provider.display_name(),
+                self.wire_format
             );
         }
         let url = api_url_with_suffix(&self.base_url, "beta/completions", None);
@@ -3709,6 +3786,191 @@ mod tests {
         assert_kimi_code_captures_exact_general_child_catalog().await;
     }
 
+    fn opencode_zen_client(server: &MockServer, model: &str) -> DeepSeekClient {
+        let config = Config {
+            provider: Some("opencode-zen".to_string()),
+            providers: Some(ProvidersConfig {
+                opencode_zen: ProviderConfig {
+                    api_key: Some("zen-test-key".to_string()),
+                    base_url: Some(server.uri()),
+                    model: Some(model.to_string()),
+                    ..ProviderConfig::default()
+                },
+                ..ProvidersConfig::default()
+            }),
+            ..Config::default()
+        };
+        DeepSeekClient::new(&config).expect("OpenCode Zen client should resolve its model route")
+    }
+
+    fn minimal_zen_request(model: &str) -> MessageRequest {
+        translation_message_request("hello", model.to_string(), "English")
+    }
+
+    fn assert_zen_bearer_without_codex_headers(request: &wiremock::Request) {
+        assert_eq!(
+            request
+                .headers
+                .get(AUTHORIZATION)
+                .and_then(|value| value.to_str().ok()),
+            Some("Bearer zen-test-key")
+        );
+        for forbidden in [
+            "openai-beta",
+            "originator",
+            "chatgpt-account-id",
+            "x-api-key",
+        ] {
+            assert!(
+                request.headers.get(forbidden).is_none(),
+                "Zen request must not include {forbidden}"
+            );
+        }
+    }
+
+    fn assert_zen_messages_api_key_without_bearer(request: &wiremock::Request) {
+        assert_eq!(
+            request
+                .headers
+                .get("x-api-key")
+                .and_then(|value| value.to_str().ok()),
+            Some("zen-test-key")
+        );
+        assert!(
+            request.headers.get(AUTHORIZATION).is_none(),
+            "Zen Messages request must not include Authorization"
+        );
+        for forbidden in ["openai-beta", "originator", "chatgpt-account-id"] {
+            assert!(
+                request.headers.get(forbidden).is_none(),
+                "Zen request must not include {forbidden}"
+            );
+        }
+    }
+
+    #[tokio::test]
+    async fn opencode_zen_responses_request_uses_responses_route_without_oauth_headers() {
+        let server = MockServer::start().await;
+        Mock::given(method("POST"))
+            .and(path("/v1/responses"))
+            .respond_with(
+                ResponseTemplate::new(200)
+                    .insert_header("Content-Type", "text/event-stream")
+                    .set_body_string("data: [DONE]\n\n"),
+            )
+            .expect(1)
+            .mount(&server)
+            .await;
+
+        let client = opencode_zen_client(&server, "gpt-5.5");
+        assert_eq!(client.wire_format, WireFormat::Responses);
+        let mut stream = client
+            .create_message_stream(minimal_zen_request("gpt-5.5"))
+            .await
+            .expect("Zen Responses request should start");
+        while let Some(event) = stream.next().await {
+            event.expect("Zen Responses stream event");
+        }
+
+        let requests = server.received_requests().await.expect("recorded request");
+        assert_eq!(requests.len(), 1);
+        assert_zen_bearer_without_codex_headers(&requests[0]);
+        let body: Value = serde_json::from_slice(&requests[0].body).expect("Responses JSON body");
+        assert_eq!(body.get("model").and_then(Value::as_str), Some("gpt-5.5"));
+        assert!(body.get("input").is_some(), "Responses body: {body}");
+        assert!(body.get("messages").is_none(), "Responses body: {body}");
+    }
+
+    #[tokio::test]
+    async fn opencode_zen_messages_request_shape_uses_api_key_anthropic_route() {
+        let server = MockServer::start().await;
+        Mock::given(method("POST"))
+            .and(path("/v1/messages"))
+            .respond_with(ResponseTemplate::new(200).set_body_json(json!({
+                "id": "msg_zen",
+                "type": "message",
+                "role": "assistant",
+                "content": [{"type": "text", "text": "ok"}],
+                "model": "claude-sonnet-4-6",
+                "stop_reason": "end_turn",
+                "stop_sequence": null,
+                "usage": {"input_tokens": 1, "output_tokens": 1}
+            })))
+            .expect(1)
+            .mount(&server)
+            .await;
+
+        let client = opencode_zen_client(&server, "claude-sonnet-4-6");
+        assert_eq!(client.wire_format, WireFormat::AnthropicMessages);
+        client
+            .create_message(minimal_zen_request("claude-sonnet-4-6"))
+            .await
+            .expect("Zen Messages request should succeed");
+
+        let requests = server.received_requests().await.expect("recorded request");
+        assert_eq!(requests.len(), 1);
+        assert_zen_messages_api_key_without_bearer(&requests[0]);
+        assert_eq!(
+            requests[0]
+                .headers
+                .get("anthropic-version")
+                .and_then(|value| value.to_str().ok()),
+            Some("2023-06-01")
+        );
+    }
+
+    #[tokio::test]
+    async fn opencode_zen_chat_request_uses_chat_completions_route() {
+        let server = MockServer::start().await;
+        Mock::given(method("POST"))
+            .and(path("/v1/chat/completions"))
+            .respond_with(ResponseTemplate::new(200).set_body_json(json!({
+                "id": "chatcmpl_zen",
+                "object": "chat.completion",
+                "model": "deepseek-v4-pro",
+                "choices": [{
+                    "index": 0,
+                    "message": {"role": "assistant", "content": "ok"},
+                    "finish_reason": "stop"
+                }],
+                "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2}
+            })))
+            .expect(1)
+            .mount(&server)
+            .await;
+
+        let client = opencode_zen_client(&server, "deepseek-v4-pro");
+        assert_eq!(client.wire_format, WireFormat::ChatCompletions);
+        client
+            .create_message(minimal_zen_request("deepseek-v4-pro"))
+            .await
+            .expect("Zen Chat Completions request should succeed");
+
+        let requests = server.received_requests().await.expect("recorded request");
+        assert_eq!(requests.len(), 1);
+        assert_zen_bearer_without_codex_headers(&requests[0]);
+        assert!(requests[0].headers.get("anthropic-version").is_none());
+    }
+
+    #[tokio::test]
+    async fn opencode_zen_client_fails_closed_when_request_model_changes_protocol() {
+        let server = MockServer::start().await;
+        let client = opencode_zen_client(&server, "gpt-5.5");
+
+        let error = client
+            .create_message(minimal_zen_request("claude-sonnet-4-6"))
+            .await
+            .expect_err("a Responses-bound client must not send a Messages model");
+        assert!(format!("{error:#}").contains("resolve a new model route"));
+        assert!(
+            server
+                .received_requests()
+                .await
+                .expect("recorded requests")
+                .is_empty()
+        );
+    }
+
     const CONFIG_SECRET_SENTINELS: [&str; 8] = [
         "deepseek-config-secret-001",
         "arcee-config-secret-002",
@@ -4968,7 +5230,7 @@ mod tests {
             message.contains("FIM completion is not supported"),
             "{message}"
         );
-        assert!(message.contains("Anthropic Messages protocol"), "{message}");
+        assert!(message.contains("no proven FIM wire contract"), "{message}");
         let requests = server.received_requests().await.expect("recorded requests");
         assert!(
             requests.is_empty(),
diff --git a/crates/tui/src/client/responses.rs b/crates/tui/src/client/responses.rs
index df7ffd20a6..179676098e 100644
--- a/crates/tui/src/client/responses.rs
+++ b/crates/tui/src/client/responses.rs
@@ -19,7 +19,7 @@ use crate::models::{
 use crate::tools::schema_sanitize;
 
 use super::{
-    DeepSeekClient, ERROR_BODY_MAX_BYTES, bounded_error_text, from_api_tool_name,
+    DeepSeekClient, ERROR_BODY_MAX_BYTES, api_url, bounded_error_text, from_api_tool_name,
     system_to_instructions, to_api_tool_name,
 };
 
@@ -83,7 +83,12 @@ impl DeepSeekClient {
         request: MessageRequest,
     ) -> Result<StreamEventBox> {
         let body = build_responses_body(&request);
-        let url = format!("{}{}", self.base_url, CODEX_RESPONSES_PATH);
+        let is_codex = self.api_provider == crate::config::ApiProvider::OpenaiCodex;
+        let url = if is_codex {
+            format!("{}{}", self.base_url, CODEX_RESPONSES_PATH)
+        } else {
+            api_url(&self.base_url, "responses")
+        };
 
         // The bearer Authorization header is already installed as a default
         // header on both the dual and the HTTP/1.1 twin client (resolved from
@@ -117,11 +122,14 @@ impl DeepSeekClient {
                     let mut builder = client
                         .post(&url)
                         .header("Content-Type", "application/json")
-                        .header("Accept", "text/event-stream")
-                        .header("OpenAI-Beta", "responses=experimental")
-                        .header("originator", "codex_cli_rs");
-                    if let Some(account_id) = &account_id {
-                        builder = builder.header("chatgpt-account-id", account_id);
+                        .header("Accept", "text/event-stream");
+                    if is_codex {
+                        builder = builder
+                            .header("OpenAI-Beta", "responses=experimental")
+                            .header("originator", "codex_cli_rs");
+                        if let Some(account_id) = &account_id {
+                            builder = builder.header("chatgpt-account-id", account_id);
+                        }
                     }
                     builder.body(request_body.clone())
                 })
diff --git a/crates/tui/src/config.rs b/crates/tui/src/config.rs
index 86255c0cf8..46950e6cfb 100644
--- a/crates/tui/src/config.rs
+++ b/crates/tui/src/config.rs
@@ -70,6 +70,7 @@ pub enum ApiProvider {
     Sakana,
     LongCat,
     OpencodeGo,
+    OpencodeZen,
     Meta,
     Xai,
     /// Jiangsu Telecom TokenHub — OpenAI-compatible AI gateway.
@@ -229,7 +230,7 @@ impl ApiProvider {
 
     /// `ApiProvider` discriminant → `ProviderKind` lookup.
     /// Index 1 is `None` for the legacy `DeepseekCN` variant.
-    const KIND_LOOKUP: [Option<codewhale_config::ProviderKind>; 37] = [
+    const KIND_LOOKUP: [Option<codewhale_config::ProviderKind>; 38] = [
         Some(codewhale_config::ProviderKind::Deepseek),
         None, // DeepseekCN
         Some(codewhale_config::ProviderKind::DeepseekAnthropic),
@@ -263,6 +264,7 @@ impl ApiProvider {
         Some(codewhale_config::ProviderKind::Sakana),
         Some(codewhale_config::ProviderKind::LongCat),
         Some(codewhale_config::ProviderKind::OpencodeGo),
+        Some(codewhale_config::ProviderKind::OpencodeZen),
         Some(codewhale_config::ProviderKind::Meta),
         Some(codewhale_config::ProviderKind::Xai),
         Some(codewhale_config::ProviderKind::Telecomjs),
@@ -270,7 +272,7 @@ impl ApiProvider {
     ];
 
     /// `ProviderKind` discriminant → `ApiProvider` lookup.
-    const FROM_KIND_LOOKUP: [Self; 36] = [
+    const FROM_KIND_LOOKUP: [Self; 37] = [
         Self::Deepseek,
         Self::DeepseekAnthropic,
         Self::NvidiaNim,
@@ -303,6 +305,7 @@ impl ApiProvider {
         Self::Sakana,
         Self::LongCat,
         Self::OpencodeGo,
+        Self::OpencodeZen,
         Self::Meta,
         Self::Xai,
         Self::Telecomjs,
@@ -402,6 +405,10 @@ fn subagent_provider_key_matches(key: &str, provider: ApiProvider) -> bool {
         ApiProvider::OpencodeGo => {
             matches!(normalized.as_str(), "opencode_go" | "opencodego")
         }
+        ApiProvider::OpencodeZen => matches!(
+            normalized.as_str(),
+            "opencode_zen" | "opencodezen" | "zen" | "opencode"
+        ),
         ApiProvider::Meta => matches!(
             normalized.as_str(),
             "meta" | "meta_ai" | "meta_model_api" | "muse" | "muse_spark"
@@ -1308,6 +1315,7 @@ pub fn model_completion_names_for_provider(provider: ApiProvider) -> Vec<&'stati
         ApiProvider::Sakana => vec![DEFAULT_SAKANA_MODEL, SAKANA_FUGU_ULTRA_MODEL],
         ApiProvider::LongCat => vec![DEFAULT_LONGCAT_MODEL],
         ApiProvider::OpencodeGo => OPENCODE_GO_CHAT_MODELS.to_vec(),
+        ApiProvider::OpencodeZen => vec![DEFAULT_OPENCODE_ZEN_MODEL],
         ApiProvider::Meta => vec![DEFAULT_META_MODEL],
         ApiProvider::Xai => vec![
             DEFAULT_XAI_MODEL,
@@ -2909,6 +2917,14 @@ pub struct ProvidersConfig {
     pub longcat: ProviderConfig,
     #[serde(default, alias = "opencode-go", alias = "opencodego")]
     pub opencode_go: ProviderConfig,
+    #[serde(
+        default,
+        alias = "opencode-zen",
+        alias = "opencodezen",
+        alias = "zen",
+        alias = "opencode"
+    )]
+    pub opencode_zen: ProviderConfig,
     #[serde(
         default,
         alias = "meta-ai",
@@ -2981,6 +2997,7 @@ impl ProvidersConfig {
             ("providers.minimax_anthropic", &self.minimax_anthropic),
             ("providers.sakana", &self.sakana),
             ("providers.opencode_go", &self.opencode_go),
+            ("providers.opencode_zen", &self.opencode_zen),
             ("providers.meta", &self.meta),
             ("providers.xai", &self.xai),
         ];
@@ -4277,6 +4294,7 @@ impl Config {
             ApiProvider::Sakana => &providers.sakana,
             ApiProvider::LongCat => &providers.longcat,
             ApiProvider::OpencodeGo => &providers.opencode_go,
+            ApiProvider::OpencodeZen => &providers.opencode_zen,
             ApiProvider::Meta => &providers.meta,
             ApiProvider::Xai => &providers.xai,
             ApiProvider::Telecomjs => &providers.telecomjs,
@@ -4343,6 +4361,7 @@ impl Config {
             ApiProvider::Sakana => &mut providers.sakana,
             ApiProvider::LongCat => &mut providers.longcat,
             ApiProvider::OpencodeGo => &mut providers.opencode_go,
+            ApiProvider::OpencodeZen => &mut providers.opencode_zen,
             ApiProvider::Meta => &mut providers.meta,
             ApiProvider::Xai => &mut providers.xai,
             ApiProvider::Telecomjs => &mut providers.telecomjs,
@@ -4677,6 +4696,7 @@ impl Config {
             ApiProvider::Sakana => DEFAULT_SAKANA_MODEL,
             ApiProvider::LongCat => DEFAULT_LONGCAT_MODEL,
             ApiProvider::OpencodeGo => DEFAULT_OPENCODE_GO_MODEL,
+            ApiProvider::OpencodeZen => DEFAULT_OPENCODE_ZEN_MODEL,
             ApiProvider::Meta => DEFAULT_META_MODEL,
             ApiProvider::Xai => DEFAULT_XAI_MODEL,
             ApiProvider::Telecomjs => DEFAULT_TELECOMJS_MODEL,
@@ -4736,6 +4756,7 @@ impl Config {
             | ApiProvider::Sakana
             | ApiProvider::LongCat
             | ApiProvider::OpencodeGo
+            | ApiProvider::OpencodeZen
             | ApiProvider::Meta
             | ApiProvider::Xai
             | ApiProvider::Telecomjs => None,
@@ -4802,6 +4823,7 @@ impl Config {
                         ApiProvider::Sakana => DEFAULT_SAKANA_BASE_URL,
                         ApiProvider::LongCat => DEFAULT_LONGCAT_BASE_URL,
                         ApiProvider::OpencodeGo => DEFAULT_OPENCODE_GO_BASE_URL,
+                        ApiProvider::OpencodeZen => DEFAULT_OPENCODE_ZEN_BASE_URL,
                         ApiProvider::Meta => DEFAULT_META_BASE_URL,
                         ApiProvider::Xai => DEFAULT_XAI_BASE_URL,
                         ApiProvider::Telecomjs => DEFAULT_TELECOMJS_BASE_URL,
@@ -5293,6 +5315,9 @@ impl Config {
             ApiProvider::Anthropic | ApiProvider::Openmodel => {
                 anyhow::bail!("{}", missing_provider_api_key_message(provider)?)
             }
+            ApiProvider::OpencodeZen => {
+                anyhow::bail!("{}", missing_provider_api_key_message(provider)?)
+            }
             ApiProvider::OpenaiCodex => anyhow::bail!("{}", crate::oauth::missing_auth_message()),
             ApiProvider::Xai => {
                 // Prefer OAuth guidance when auth_mode requests it or Grok CLI
@@ -6198,6 +6223,7 @@ fn provider_env_base_url_override(provider: ApiProvider) -> Option<String> {
         ApiProvider::Xai => &["XAI_BASE_URL"],
         ApiProvider::Telecomjs => &["TELECOMJS_BASE_URL"],
         ApiProvider::OpencodeGo => &["OPENCODE_GO_BASE_URL"],
+        ApiProvider::OpencodeZen => &["OPENCODE_ZEN_BASE_URL"],
         ApiProvider::Deepseek
         | ApiProvider::DeepseekCN
         | ApiProvider::DeepseekAnthropic
@@ -6487,6 +6513,13 @@ fn apply_env_overrides_unlocked(config: &mut Config) {
                     .opencode_go
                     .base_url = Some(value);
             }
+            ApiProvider::OpencodeZen => {
+                config
+                    .providers
+                    .get_or_insert_with(ProvidersConfig::default)
+                    .opencode_zen
+                    .base_url = Some(value);
+            }
             ApiProvider::Meta => {
                 config
                     .providers
@@ -6776,6 +6809,7 @@ fn apply_env_overrides_unlocked(config: &mut Config) {
                 ApiProvider::Sakana => &mut providers.sakana,
                 ApiProvider::LongCat => &mut providers.longcat,
                 ApiProvider::OpencodeGo => &mut providers.opencode_go,
+                ApiProvider::OpencodeZen => &mut providers.opencode_zen,
                 ApiProvider::Meta => &mut providers.meta,
                 ApiProvider::Xai => &mut providers.xai,
                 ApiProvider::Telecomjs => &mut providers.telecomjs,
@@ -6973,6 +7007,16 @@ fn apply_env_overrides_unlocked(config: &mut Config) {
             .telecomjs
             .model = Some(value);
     }
+    if matches!(config.api_provider(), ApiProvider::OpencodeZen)
+        && let Ok(value) = std::env::var("OPENCODE_ZEN_MODEL")
+        && !value.trim().is_empty()
+    {
+        config
+            .providers
+            .get_or_insert_with(ProvidersConfig::default)
+            .opencode_zen
+            .model = Some(value);
+    }
     if let Some(value) = codewhale_env_var("CODEWHALE_MODEL", "DEEPSEEK_MODEL")
         .ok()
         .or_else(|| {
@@ -7048,6 +7092,7 @@ fn apply_env_overrides_unlocked(config: &mut Config) {
                 ApiProvider::Sakana => &mut providers.sakana,
                 ApiProvider::LongCat => &mut providers.longcat,
                 ApiProvider::OpencodeGo => &mut providers.opencode_go,
+                ApiProvider::OpencodeZen => &mut providers.opencode_zen,
                 ApiProvider::Meta => &mut providers.meta,
                 ApiProvider::Xai => &mut providers.xai,
                 ApiProvider::Telecomjs => &mut providers.telecomjs,
@@ -8071,6 +8116,7 @@ fn merge_providers(
             sakana: merge_provider_config(base.sakana, override_cfg.sakana),
             longcat: merge_provider_config(base.longcat, override_cfg.longcat),
             opencode_go: merge_provider_config(base.opencode_go, override_cfg.opencode_go),
+            opencode_zen: merge_provider_config(base.opencode_zen, override_cfg.opencode_zen),
             meta: merge_provider_config(base.meta, override_cfg.meta),
             xai: merge_provider_config(base.xai, override_cfg.xai),
             telecomjs: merge_provider_config(base.telecomjs, override_cfg.telecomjs),
diff --git a/crates/tui/src/config/models.rs b/crates/tui/src/config/models.rs
index 58c307347e..b2c8c0081d 100644
--- a/crates/tui/src/config/models.rs
+++ b/crates/tui/src/config/models.rs
@@ -188,6 +188,8 @@ pub const DEFAULT_LONGCAT_BASE_URL: &str = "https://api.longcat.chat/openai/v1";
 pub const DEFAULT_OPENCODE_GO_MODEL: &str = "deepseek-v4-pro";
 pub const DEFAULT_OPENCODE_GO_BASE_URL: &str = "https://opencode.ai/zen/go/v1";
 pub use codewhale_config::OPENCODE_GO_CHAT_MODELS;
+pub const DEFAULT_OPENCODE_ZEN_MODEL: &str = "gpt-5.5";
+pub const DEFAULT_OPENCODE_ZEN_BASE_URL: &str = "https://opencode.ai/zen/v1";
 pub const DEFAULT_META_MODEL: &str = "muse-spark-1.1";
 pub const DEFAULT_META_BASE_URL: &str = "https://api.meta.ai/v1";
 pub const DEFAULT_XAI_MODEL: &str = "grok-4.5";
diff --git a/crates/tui/src/config/tests.rs b/crates/tui/src/config/tests.rs
index 1dc3c6f134..4135153099 100644
--- a/crates/tui/src/config/tests.rs
+++ b/crates/tui/src/config/tests.rs
@@ -245,6 +245,19 @@ fn missing_provider_api_key_message_uses_provider_metadata() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn opencode_zen_missing_credentials_never_mentions_codex_oauth() -> Result<()> {
+    let message = missing_provider_api_key_message(ApiProvider::OpencodeZen)?;
+    assert!(message.contains("OpenCode Zen API key not found"));
+    assert!(message.contains("OPENCODE_ZEN_API_KEY"));
+    assert!(message.contains("OPENCODE_API_KEY"));
+    assert!(message.contains("[providers.opencode_zen]"));
+    assert!(!message.contains("codex login"));
+    assert!(!message.contains("ChatGPT"));
+    assert!(!message.contains("auth.json"));
+    Ok(())
+}
+
 // GHSA-72w5-pf8h-xfp4 — regression: `allow_shell` must be opt-in.
 #[test]
 fn allow_shell_defaults_to_false_when_unset() {
diff --git a/crates/tui/src/config_persistence.rs b/crates/tui/src/config_persistence.rs
index 0602f081f0..9f84b4eaa8 100644
--- a/crates/tui/src/config_persistence.rs
+++ b/crates/tui/src/config_persistence.rs
@@ -301,6 +301,7 @@ fn provider_base_url_table_key(provider: ApiProvider) -> anyhow::Result<&'static
         ApiProvider::Sakana => Ok("sakana"),
         ApiProvider::LongCat => Ok("longcat"),
         ApiProvider::OpencodeGo => Ok("opencode_go"),
+        ApiProvider::OpencodeZen => Ok("opencode_zen"),
         ApiProvider::Meta => Ok("meta"),
         ApiProvider::Xai => Ok("xai"),
         ApiProvider::Telecomjs => Ok("telecomjs"),
diff --git a/crates/tui/src/main.rs b/crates/tui/src/main.rs
index fd88e2b1e3..90917606a2 100644
--- a/crates/tui/src/main.rs
+++ b/crates/tui/src/main.rs
@@ -6344,14 +6344,17 @@ fn doctor_provider_source(config: &Config) -> &'static str {
 }
 
 fn doctor_wire_protocol(provider: crate::config::ApiProvider) -> &'static str {
-    match provider
+    let policy = provider
         .metadata()
-        .map(|metadata| metadata.wire())
-        .unwrap_or(codewhale_config::provider::WireFormat::ChatCompletions)
-    {
-        codewhale_config::provider::WireFormat::ChatCompletions => "chat_completions",
-        codewhale_config::provider::WireFormat::Responses => "responses",
-        codewhale_config::provider::WireFormat::AnthropicMessages => "anthropic_messages",
+        .map(|metadata| metadata.wire_policy())
+        .unwrap_or(codewhale_config::provider::WirePolicy::Fixed(
+            codewhale_config::provider::WireFormat::ChatCompletions,
+        ));
+    match policy.fixed() {
+        Some(codewhale_config::provider::WireFormat::ChatCompletions) => "chat_completions",
+        Some(codewhale_config::provider::WireFormat::Responses) => "responses",
+        Some(codewhale_config::provider::WireFormat::AnthropicMessages) => "anthropic_messages",
+        None => "model_aware",
     }
 }
 
diff --git a/crates/tui/src/tools/resource_admission.rs b/crates/tui/src/tools/resource_admission.rs
index a43952b5df..730c593288 100644
--- a/crates/tui/src/tools/resource_admission.rs
+++ b/crates/tui/src/tools/resource_admission.rs
@@ -541,7 +541,7 @@ mod tests {
     #[tokio::test]
     async fn real_cargo_command_is_admitted_and_released() {
         if std::env::var_os("CODEWHALE_RESOURCE_ADMISSION_RUST_ACCEPTANCE").is_none() {
-            eprintln!(
+            tracing::info!(
                 "skipping opt-in real-rust admission acceptance; \
                  set CODEWHALE_RESOURCE_ADMISSION_RUST_ACCEPTANCE=1 to run"
             );
diff --git a/crates/tui/src/tui/provider_picker.rs b/crates/tui/src/tui/provider_picker.rs
index 57e5f71c5d..ad1cd96090 100644
--- a/crates/tui/src/tui/provider_picker.rs
+++ b/crates/tui/src/tui/provider_picker.rs
@@ -617,10 +617,9 @@ impl ProviderDashboardRow {
                     vec![
                         provider
                             .metadata()
-                            .map(|metadata| protocol_label(metadata.wire()).to_string())
-                            .unwrap_or_else(|| {
-                                protocol_label(WireFormat::ChatCompletions).to_string()
-                            }),
+                            .and_then(|metadata| metadata.wire_policy().fixed())
+                            .map(|protocol| protocol_label(protocol).to_string())
+                            .unwrap_or_else(|| "model-aware".to_string()),
                     ],
                     ProviderDefaultRoute {
                         logical_model: configured_model.unwrap_or_else(|| "invalid".to_string()),
diff --git a/crates/tui/src/tui/ui.rs b/crates/tui/src/tui/ui.rs
index 8853284500..e880f04078 100644
--- a/crates/tui/src/tui/ui.rs
+++ b/crates/tui/src/tui/ui.rs
@@ -15120,6 +15120,7 @@ fn mirror_saved_api_key_in_config(config: &mut Config, provider: ApiProvider, ap
         ApiProvider::Sakana => &mut providers.sakana,
         ApiProvider::LongCat => &mut providers.longcat,
         ApiProvider::OpencodeGo => &mut providers.opencode_go,
+        ApiProvider::OpencodeZen => &mut providers.opencode_zen,
         ApiProvider::Meta => &mut providers.meta,
         ApiProvider::Xai => &mut providers.xai,
         ApiProvider::Telecomjs => &mut providers.telecomjs,
diff --git a/docs/CONFIGURATION.md b/docs/CONFIGURATION.md
index b45fb2c98f..38fe8c1157 100644
--- a/docs/CONFIGURATION.md
+++ b/docs/CONFIGURATION.md
@@ -1281,6 +1281,7 @@ If you are upgrading from older releases:
 ### Core keys (used by the TUI/engine)
 
 - `provider` (string, optional): `deepseek` (default), `deepseek-anthropic`, `nvidia-nim`, `openai`, `atlascloud`, `wanjie-ark`, `volcengine`, `openrouter`, `xiaomi-mimo`, `novita`, `fireworks`, `siliconflow`, `arcee`, `siliconflow-CN`, `moonshot`, `sglang`, `vllm`, `ollama`, `huggingface`, `together`, `qianfan`, `openai-codex`, `anthropic`, `openmodel`, `zai`, `stepfun`, `minimax`, `deepinfra`, `sakana`, `longcat`, `opencode-go`, `meta`, `telecomjs`, or `xai`. Legacy `deepseek-cn` configs are still accepted as an alias for `deepseek`; DeepSeek uses the same official host [`https://api.deepseek.com`](https://api-docs.deepseek.com/) worldwide. `deepseek-anthropic` targets DeepSeek's Anthropic Messages-compatible endpoint at `https://api.deepseek.com/anthropic` using `DEEPSEEK_API_KEY`; `nvidia-nim` targets NVIDIA's NIM-hosted DeepSeek endpoints through `https://integrate.api.nvidia.com/v1`; `openai` targets a generic OpenAI-compatible endpoint, defaulting to `https://api.openai.com/v1`; `atlascloud` targets AtlasCloud's OpenAI-compatible endpoint at `https://api.atlascloud.ai/v1`; `wanjie-ark` targets Wanjie Ark's OpenAI-compatible endpoint at `https://maas-openapi.wanjiedata.com/api/v1`; `volcengine` targets Volcengine Ark's OpenAI-compatible coding endpoint at `https://ark.cn-beijing.volces.com/api/coding/v3`; `openrouter` targets `https://openrouter.ai/api/v1`; `xiaomi-mimo` targets Xiaomi MiMo's OpenAI-compatible endpoint, using `https://token-plan-sgp.xiaomimimo.com/v1` by default for Token Plan keys (`tp-...`) and `https://api.xiaomimimo.com/v1` for pay-as-you-go keys. For Token Plan accounts outside the Singapore default, set `base_url` explicitly or use `mode = "token-plan-cn"` for China and `mode = "token-plan-ams"` for Europe/Amsterdam; `novita` targets `https://api.novita.ai/openai/v1`; `fireworks` targets `https://api.fireworks.ai/inference/v1`; `siliconflow` targets SiliconFlow, defaulting to `https://api.siliconflow.com/v1`; `arcee` targets Arcee AI's OpenAI-compatible endpoint at `https://api.arcee.ai/api/v1`; `siliconflow-CN` targets the SiliconFlow China regional endpoint through `[providers.siliconflow_cn]`; `moonshot` targets Moonshot/Kimi, defaulting to `https://api.moonshot.ai/v1`; `sglang` targets a self-hosted OpenAI-compatible endpoint, defaulting to `http://localhost:30000/v1`; `vllm` targets a self-hosted vLLM OpenAI-compatible endpoint, defaulting to `http://localhost:8000/v1`; `ollama` targets Ollama's OpenAI-compatible endpoint, defaulting to `http://localhost:11434/v1`; `huggingface` targets Hugging Face Inference Providers at `https://router.huggingface.co/v1`; `together` targets Together AI at `https://api.together.xyz/v1`; `qianfan` targets Baidu Qianfan at `https://api.baiduqianfan.ai/v1`; `openai-codex` targets ChatGPT/Codex OAuth; `anthropic` targets Claude's native Messages API; `openmodel` targets OpenModel's Anthropic-compatible Messages API at `https://api.openmodel.ai`; `zai` targets Z.ai at `https://api.z.ai/api/coding/paas/v4`; `stepfun` targets StepFun at `https://api.stepfun.ai/v1`; `minimax` targets MiniMax at `https://api.minimax.io/v1`; `deepinfra` targets DeepInfra at `https://api.deepinfra.com/v1/openai`; `sakana` targets Sakana AI Fugu at `https://api.sakana.ai/v1`; `longcat` targets Meituan LongCat at `https://api.longcat.chat/openai/v1`; `opencode-go` targets the subscription-backed OpenCode Go Chat Completions route at `https://opencode.ai/zen/go/v1`; `meta` targets Meta Model API; `telecomjs` targets TelecomJS TokenHub at `https://aigw.telecomjs.com/v1`; and `xai` targets xAI's API-key or OAuth route.
+- `opencode-zen` (string provider value): selects the model-aware OpenCode Zen gateway through `[providers.opencode_zen]`. The default base URL is `https://opencode.ai/zen/v1`, the default model is `gpt-5.5`, and credentials come from `api_key`, `OPENCODE_ZEN_API_KEY`, or fallback `OPENCODE_API_KEY`—never ChatGPT/Codex OAuth. `OPENCODE_ZEN_BASE_URL` and `OPENCODE_ZEN_MODEL` are accepted. The selected model is resolved through the curated Zen catalog: GPT uses Responses, Claude/Qwen use Anthropic Messages, and the documented DeepSeek/MiniMax/GLM/Kimi/Grok/free rows use Chat Completions. Gemini and unknown models fail closed because Codewhale has no proven supported wire contract for them. See the exact current model groups in [`PROVIDERS.md`](PROVIDERS.md#opencode-zen-protocol-catalog).
 - `minimax-anthropic` (string provider value): selects MiniMax's Anthropic-compatible Messages route through `[providers.minimax_anthropic]`. The default Base URL is `https://api.minimax.io/anthropic`; set `https://api.minimaxi.com/anthropic` for China. Keep the `/anthropic` suffix because Codewhale appends `/v1/messages`. The route uses `MINIMAX_API_KEY` and defaults to `MiniMax-M3`; `MiniMax-M2.7` is also registered. Official M3 input modalities are text, image, and video, with adaptive or disabled thinking. M2.7 is text-only and always keeps thinking enabled.
 - `api_key` (string, required for hosted providers): must be non-empty for DeepSeek/hosted providers (or set the provider API key env var). Self-hosted SGLang, vLLM, and Ollama can omit it.
 - `auth_mode` (string, optional provider-table key): selects a provider-specific authentication contract. Kimi Code membership uses `auth_mode = "api_key"` (or omit the field), a key created in the [Kimi Code console](https://www.kimi.com/code/console), `base_url = "https://api.kimi.com/coding/v1"`, and bare `model = "k3"` for K3. Codewhale gives that route a safe 262,144-token baseline; set `context_window = 1048576` only when the Kimi Code plan includes 1M access (Allegretto and above). `k3[1m]` is a Claude Code-only convention, not an API model ID, and Codewhale rejects it instead of silently changing the wire model or assuming an entitlement. `model = "kimi-for-coding"` remains the valid K2.7 compatibility route available to all Kimi Code members. Legacy `auth_mode = "kimi_oauth"` fails closed with API-key guidance and never probes, reads, refreshes, or rewrites `kimi_cli`/`kimi_code_cli` credential files. First-class OAuth requires Codewhale's own vendor-registered client identity and remains tracked in #4417.
diff --git a/docs/PROVIDERS.md b/docs/PROVIDERS.md
index e6dcd355e6..6df1bfc6b1 100644
--- a/docs/PROVIDERS.md
+++ b/docs/PROVIDERS.md
@@ -33,7 +33,7 @@ The canonical provider IDs are:
 `siliconflow`, `arcee`, `siliconflow-CN`, `moonshot`, `sglang`, `vllm`,
 `ollama`, `huggingface`, `together`, `qianfan`, `openai-codex`, `anthropic`,
 `openmodel`, `zai`, `stepfun`, `minimax`, `deepinfra`, `sakana`, `longcat`,
-`opencode-go`, `meta`, `telecomjs`, and `xai`.
+`opencode-go`, `opencode-zen`, `meta`, `telecomjs`, and `xai`.
 
 Use any of these surfaces to select a provider:
 
@@ -113,6 +113,7 @@ the listed provider env vars.
 | `sakana` | `[providers.sakana]` | OpenAI Chat Completions | `FUGU_API_KEY`, `SAKANA_API_KEY` |
 | `longcat` | `[providers.longcat]` | OpenAI Chat Completions | `LONGCAT_API_KEY` |
 | `opencode-go` | `[providers.opencode_go]` | OpenAI Chat Completions | `OPENCODE_GO_API_KEY` |
+| `opencode-zen` | `[providers.opencode_zen]` | Model-aware: OpenAI Responses, Anthropic Messages, or OpenAI Chat Completions | `OPENCODE_ZEN_API_KEY`, `OPENCODE_API_KEY` |
 | `meta` | `[providers.meta]` | OpenAI Chat Completions | `META_MODEL_API_KEY`, `MODEL_API_KEY` |
 | `telecomjs` | `[providers.telecomjs]` | OpenAI Chat Completions | `TELECOMJS_API_KEY` |
 | `xai` | `[providers.xai]` | OpenAI Chat Completions | `XAI_API_KEY` |
@@ -120,8 +121,9 @@ the listed provider env vars.
 Default base URLs and models for each route are listed in the shipped provider
 table below. The wire protocol values above are derived from
 `crates/config/src/provider.rs`: `ChatCompletions` is the default,
-`openai-codex` overrides to `Responses`, and `deepseek-anthropic`,
-`anthropic`, plus `openmodel` override to `AnthropicMessages`.
+`openai-codex` overrides to `Responses`; `deepseek-anthropic`, `anthropic`, and
+`openmodel` override to `AnthropicMessages`; and `opencode-zen` resolves the
+protocol from the selected model's curated offering.
 
 ## Auth And Env Rules
 
@@ -253,7 +255,8 @@ configuration path instead of guessing a vendor page.
 | `sglang`, `vllm`, `ollama` | Local OpenAI-compatible endpoints are keyless by default; configure a key only when the server requires one. |
 | `sakana` | [Sakana AI API keys](https://console.sakana.ai/api-keys) ([get started](https://console.sakana.ai/get-started)) |
 | `longcat` | [Meituan LongCat platform](https://longcat.chat/platform) |
-| `opencode-go` | [OpenCode Zen](https://opencode.ai/zen/) |
+| `opencode-go` | [OpenCode Go](https://opencode.ai/docs/go/) |
+| `opencode-zen` | [OpenCode Zen](https://opencode.ai/docs/zen/) |
 | `meta` | [Meta Model API](https://developer.meta.com/ai/) |
 | `telecomjs` | [TelecomJS TokenHub](https://aigw.telecomjs.com/) |
 | `xai` | [xAI Console](https://console.x.ai/) for an API key, Codewhale-owned device login, or explicitly consented read-only Grok CLI credentials. |
@@ -340,10 +343,41 @@ Kimi remains API-key-only; external consent for Kimi is rejected.
 | `sakana` | `[providers.sakana]` | `FUGU_API_KEY`, `SAKANA_API_KEY` | `SAKANA_BASE_URL`; default `https://api.sakana.ai/v1` | `fugu` (default), `fugu-ultra-20260615` | Sakana AI Fugu OpenAI-compatible route. Standard Chat Completions wire protocol; streaming supported. `fugu-ultra-20260615` is the heavy/reasoning variant. Env var aliases: `FUGU_API_KEY` (primary), `SAKANA_API_KEY`; provider aliases: `sakana-ai`, `sakana_ai`, `fugu`. |
 | `longcat` | `[providers.longcat]` | `LONGCAT_API_KEY` | `LONGCAT_BASE_URL`; default `https://api.longcat.chat/openai/v1` | `LongCat-2.0` (default) | Meituan LongCat curated model gateway. OpenAI-compatible Chat Completions wire protocol. Sign up at https://longcat.chat/platform for an API key. Provider aliases: `long-cat`, `meituan-longcat`, `meituan`. |
 | `opencode-go` | `[providers.opencode_go]` | `OPENCODE_GO_API_KEY` | `OPENCODE_GO_BASE_URL`; default `https://opencode.ai/zen/go/v1` | `deepseek-v4-pro` (default), `grok-4.5`, `glm-5.2`, `glm-5.1`, `kimi-k3`, `kimi-k2.7-code`, `kimi-k2.6`, `deepseek-v4-flash`, `mimo-v2.5`, `mimo-v2.5-pro` | [OpenCode Go](https://opencode.ai/docs/go/) subscription route using OpenAI-compatible Chat Completions. `OPENCODE_GO_MODEL` is accepted. Codewhale uses bare wire IDs; familiar `opencode-go/<model-id>` input aliases normalize to the bare ID. Go models documented only on the Anthropic `/messages` endpoint are deliberately not advertised by this route until Codewhale supports per-model wire selection. Billing surfaces show the Go allowance instead of token-price estimates. |
+| `opencode-zen` | `[providers.opencode_zen]` | `OPENCODE_ZEN_API_KEY`, fallback `OPENCODE_API_KEY` | `OPENCODE_ZEN_BASE_URL`; default `https://opencode.ai/zen/v1` | `gpt-5.5` (default); current documented GPT, Claude, Qwen, DeepSeek, MiniMax, GLM, Kimi, Grok, and free-model IDs | [OpenCode Zen](https://opencode.ai/docs/zen/) model-aware gateway. `OPENCODE_ZEN_MODEL` is accepted, and official `opencode/<model-id>` selectors normalize to bare wire IDs. GPT rows use `/responses`; Claude and Qwen rows use `/messages`; DeepSeek, MiniMax, GLM, Kimi, Grok, and the listed free rows use `/chat/completions`. Responses and Chat Completions authenticate with Bearer `Authorization`, while Anthropic Messages uses `x-api-key`; none of these routes use ChatGPT/Codex OAuth guidance or headers. Gemini currently fails closed because its model-specific Google wire protocol is not implemented. Unknown models also fail closed until their protocol is present in the curated catalog. |
 | `meta` | `[providers.meta]` | `META_MODEL_API_KEY`, `MODEL_API_KEY` | `META_MODEL_API_BASE_URL`, `MODEL_API_BASE_URL`; default `https://api.meta.ai/v1` | `muse-spark-1.1` (default) | [Meta Model API](https://developer.meta.com/ai/resources/blog/build-with-muse-spark/) public-preview route using OpenAI-compatible Chat Completions. Muse Spark 1.1 keeps its wire ID, tool support, 1M context, 32K output metadata, and `none` through `xhigh` reasoning effort. `META_MODEL_API_MODEL` and `MODEL_API_MODEL` are accepted. Provider aliases: `meta-ai`, `meta_model_api`, `muse`, `muse-spark`. |
 | `telecomjs` | `[providers.telecomjs]` | `TELECOMJS_API_KEY` | `TELECOMJS_BASE_URL`; default `https://aigw.telecomjs.com/v1` | `deepseek-v4-pro` conservative fallback; authenticated `/models` rows when a key is configured | TelecomJS TokenHub OpenAI-compatible Chat Completions route. Live catalogs are isolated by provider and key fingerprint, stale rows survive transient refresh failures, and unsupported reasoning request fields are omitted. `TELECOMJS_MODEL` is accepted. Provider aliases: `telecom-js`, `telecom_js`, `telecomjs-cn`, `tokenhub`. |
 | `xai` | `[providers.xai]` | `XAI_API_KEY`, Codewhale-owned device OAuth, or explicit read-only Grok CLI consent | `XAI_BASE_URL`; default `https://api.x.ai/v1` | `grok-4.5` (default), `grok-4.3`, `grok-build`, `grok-composer-2.5-fast`, `grok-4.20-0309-reasoning`, `grok-4.20-0309-non-reasoning` | xAI/Grok OpenAI-compatible Chat Completions route. **API-key** (default): Bearer token from console.x.ai via `XAI_API_KEY` / keyring / `api_key`. **OAuth**: `codewhale auth xai-device` uses SSH-friendly device login and Codewhale-owned storage, which may refresh itself. Existing Grok CLI credentials require `codewhale auth external-consent --provider xai --mode read-only`; the granted external file is never refreshed or rewritten. OAuth may return HTTP 403 on some SuperGrok tiers — keep API-key as the reliable fallback. `XAI_MODEL` is accepted. Provider aliases: `x-ai`, `x_ai`, `grok`. |
 
+### OpenCode Zen protocol catalog
+
+Zen Responses and Chat Completions requests authenticate with Bearer
+`Authorization`; Zen Anthropic Messages requests use `x-api-key`. None of these
+routes add ChatGPT/Codex OAuth headers.
+
+The bundled Zen transport snapshot follows the [official endpoint
+table](https://opencode.ai/docs/zen/) and is intentionally explicit:
+
+- Responses: `gpt-5.6-sol`, `gpt-5.6-terra`, `gpt-5.6-luna`, `gpt-5.5`,
+  `gpt-5.5-pro`, `gpt-5.4`, `gpt-5.4-pro`, `gpt-5.4-mini`, `gpt-5.4-nano`,
+  `gpt-5.3-codex`, `gpt-5.3-codex-spark`, `gpt-5.2`, `gpt-5.2-codex`,
+  `gpt-5.1`, `gpt-5.1-codex`, `gpt-5.1-codex-max`,
+  `gpt-5.1-codex-mini`, `gpt-5`, `gpt-5-codex`, `gpt-5-nano`.
+- Anthropic Messages: `claude-fable-5`, `claude-opus-4-8`,
+  `claude-opus-4-7`, `claude-opus-4-6`, `claude-opus-4-5`,
+  `claude-sonnet-5`, `claude-sonnet-4-6`, `claude-sonnet-4-5`,
+  `claude-haiku-4-5`, `qwen3.7-max`, `qwen3.7-plus`, `qwen3.6-plus`,
+  `qwen3.5-plus`.
+- Chat Completions: `deepseek-v4-pro`, `deepseek-v4-flash`, `minimax-m3`,
+  `minimax-m2.7`, `minimax-m2.5`, `glm-5.2`, `glm-5.1`, `glm-5`,
+  `kimi-k2.5`, `kimi-k2.6`, `kimi-k2.7-code`, `grok-4.5`,
+  `grok-build-0.1`, `big-pickle`, `mimo-v2.5-free`,
+  `north-mini-code-free`, `nemotron-3-ultra-free`,
+  `deepseek-v4-flash-free`.
+
+Gemini entries are excluded because the official table assigns them Google's
+model-specific protocol. A catalog miss never falls back to another Zen wire
+shape, including when a custom Zen base URL is configured.
+
 ### Hugging Face Provider vs MCP vs Hub
 
 Codewhale's `huggingface` provider ID is only the OpenAI-compatible chat
diff --git a/docs/public-surface-facts.json b/docs/public-surface-facts.json
index 4a4d305a5a..f1cd7b20df 100644
--- a/docs/public-surface-facts.json
+++ b/docs/public-surface-facts.json
@@ -15,7 +15,7 @@
   },
   "sourceCandidate": {
     "version": "0.9.1",
-    "providerCount": 35,
+    "providerCount": 36,
     "toolCount": 70,
     "sandboxBackends": [
       "seatbelt (macOS, when available)",
diff --git a/scripts/check-provider-registry.py b/scripts/check-provider-registry.py
index 66aba03e01..55055a2292 100644
--- a/scripts/check-provider-registry.py
+++ b/scripts/check-provider-registry.py
@@ -143,14 +143,15 @@ def provider_kind_ids(config_rs: str) -> dict[str, str]:
         provider_rs,
     )
     ids: dict[str, str] = {variant: provider_id for variant, provider_id in pairs}
-    # OpenaiCodex, Anthropic, DeepseekAnthropic, and MinimaxAnthropic use
-    # manual impls rather than the provider!() macro.
+    # Providers with non-fixed wire policy or custom auth behavior use manual
+    # impls rather than the provider!() macro.
     for variant_name, id_literal in [
         ("DeepseekAnthropic", "deepseek-anthropic"),
         ("OpenaiCodex", "openai-codex"),
         ("Anthropic", "anthropic"),
         ("Openmodel", "openmodel"),
         ("MinimaxAnthropic", "minimax-anthropic"),
+        ("OpencodeZen", "opencode-zen"),
     ]:
         match = re.search(
             rf'impl\s+Provider\s+for\s+{variant_name}.*?fn\s+id.*?\"({id_literal})\"',
diff --git a/web/lib/facts-drift.ts b/web/lib/facts-drift.ts
index e5bf05a363..395c217edc 100644
--- a/web/lib/facts-drift.ts
+++ b/web/lib/facts-drift.ts
@@ -128,6 +128,7 @@ function deriveProvidersFromConfig(cfg: string): ProviderFact[] {
     Qianfan: { id: "qianfan", label: "Baidu Qianfan", env: "QIANFAN_API_KEY / BAIDU_QIANFAN_API_KEY" },
     OpenaiCodex: { id: "openai-codex", label: "OpenAI Codex", env: "ChatGPT/Codex OAuth via `codex login` (OPENAI_CODEX_ACCESS_TOKEN / CODEX_ACCESS_TOKEN override)" },
     OpencodeGo: { id: "opencode-go", label: "OpenCode Go", env: "OPENCODE_GO_API_KEY" },
+    OpencodeZen: { id: "opencode-zen", label: "OpenCode Zen", env: "OPENCODE_ZEN_API_KEY / OPENCODE_API_KEY" },
     Anthropic: { id: "anthropic", label: "Anthropic", env: "ANTHROPIC_API_KEY" },
     Zai: { id: "zai", label: "Z.ai", env: "ZAI_API_KEY / Z_AI_API_KEY" },
     Stepfun: { id: "stepfun", label: "StepFun", env: "STEPFUN_API_KEY / STEP_API_KEY" },
diff --git a/web/lib/facts.generated.ts b/web/lib/facts.generated.ts
index 1c1eca9fec..2bc7e9f109 100644
--- a/web/lib/facts.generated.ts
+++ b/web/lib/facts.generated.ts
@@ -27,7 +27,7 @@ export interface RepoFacts {
 }
 
 export const FACTS: RepoFacts = {
-  "generatedAt": "2026-07-26T12:21:33.617Z",
+  "generatedAt": "2026-07-26T23:54:26.919Z",
   "sourceRevision": null,
   "sourceCommittedAt": null,
   "version": "0.9.1",
@@ -216,6 +216,11 @@ export const FACTS: RepoFacts = {
       "label": "OpenCode Go",
       "env": "OPENCODE_GO_API_KEY"
     },
+    {
+      "id": "opencode-zen",
+      "label": "OpenCode Zen",
+      "env": "OPENCODE_ZEN_API_KEY / OPENCODE_API_KEY"
+    },
     {
       "id": "meta",
       "label": "Meta Model API",
diff --git a/web/scripts/facts-lib.mjs b/web/scripts/facts-lib.mjs
index 4636c96858..f54f8ff923 100644
--- a/web/scripts/facts-lib.mjs
+++ b/web/scripts/facts-lib.mjs
@@ -86,6 +86,7 @@ const PROVIDER_LABEL_MAP = {
   Qianfan: { id: "qianfan", label: "Baidu Qianfan", env: "QIANFAN_API_KEY / BAIDU_QIANFAN_API_KEY" },
   OpenaiCodex: { id: "openai-codex", label: "OpenAI Codex", env: "ChatGPT/Codex OAuth via `codex login` (OPENAI_CODEX_ACCESS_TOKEN / CODEX_ACCESS_TOKEN override)" },
   OpencodeGo: { id: "opencode-go", label: "OpenCode Go", env: "OPENCODE_GO_API_KEY" },
+  OpencodeZen: { id: "opencode-zen", label: "OpenCode Zen", env: "OPENCODE_ZEN_API_KEY / OPENCODE_API_KEY" },
   Anthropic: { id: "anthropic", label: "Anthropic", env: "ANTHROPIC_API_KEY" },
   Zai: { id: "zai", label: "Z.ai", env: "ZAI_API_KEY / Z_AI_API_KEY" },
   Stepfun: { id: "stepfun", label: "StepFun", env: "STEPFUN_API_KEY / STEP_API_KEY" },