feat(providers): add OpenCode Zen gateway as a declarative provider (#10939)

crates/goose-provider-types/src/canonical/name_builder.rs

@@ -53,6 +53,7 @@ pub fn map_provider_name(provider: &str) -> &str {
         "zhipu" => "zhipuai",
         "novita" => "novita-ai",
         "opencode_go" => "opencode-go",
+        "opencode_zen" => "opencode",
         "ollama_cloud" => "ollama-cloud",
         "kimi_code" => "kimi-for-coding",
         _ => provider,
@@ -345,6 +346,10 @@ mod tests {
             map_to_canonical_model("opencode_go", "kimi-k2.6", r),
             Some("opencode-go/kimi-k2.6".to_string())
         );
+        assert_eq!(
+            map_to_canonical_model("opencode_zen", "kimi-k3", r),
+            Some("opencode/kimi-k3".to_string())
+        );
 
         // === OpenRouter ===
         assert_eq!(

crates/goose-providers/src/declarative.rs

@@ -39,6 +39,7 @@ pub(crate) mod declarative_providers {
         ollama_cloud,
         omlx,
         opencode_go,
+        opencode_zen,
         orcarouter,
         ovhcloud,
         perplexity,

crates/goose-providers/src/declarative/definitions/opencode_zen.json

@@ -0,0 +1,28 @@
+{
+  "name": "opencode_zen",
+  "engine": "openai",
+  "display_name": "OpenCode Zen",
+  "description": "OpenCode Zen gateway — curated, benchmarked models through the OpenAI-compatible API.",
+  "api_key_env": "OPENCODE_API_KEY",
+  "base_url": "https://opencode.ai/zen/v1",
+  "catalog_provider_id": "opencode",
+  "dynamic_models": false,
+  "model_doc_link": "https://opencode.ai/docs/zen",
+  "preserves_thinking": true,
+  "models": [
+    {"name": "kimi-k3", "context_limit": 262144},
+    {"name": "kimi-k2.7-code", "context_limit": 262144},
+    {"name": "kimi-k2.6", "context_limit": 262144},
+    {"name": "kimi-k2.5", "context_limit": 262144},
+    {"name": "glm-5.2", "context_limit": 204800},
+    {"name": "glm-5.1", "context_limit": 204800},
+    {"name": "deepseek-v4-pro", "context_limit": 1000000},
+    {"name": "deepseek-v4-flash", "context_limit": 1000000},
+    {"name": "deepseek-v4-flash-free", "context_limit": 1000000},
+    {"name": "minimax-m3", "context_limit": 204800},
+    {"name": "minimax-m2.7", "context_limit": 204800},
+    {"name": "minimax-m2.5", "context_limit": 204800},
+    {"name": "mimo-v2.5-free", "context_limit": 262144}
+  ],
+  "supports_streaming": true
+}