fix(opencode): generate reasoning variants for all OpenRouter models. (#30332)

Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/opencode/src/provider/transform.ts

@@ -703,12 +703,11 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
 
   switch (model.api.npm) {
     case "@openrouter/ai-sdk-provider":
-      if (!id.includes("gpt") && !id.includes("gemini-3") && !id.includes("claude")) return {}
       return Object.fromEntries(
-        (id.includes("gpt") ? openaiCompatibleReasoningEfforts(id) : OPENAI_EFFORTS).map((effort) => [
+        (model.api.id.startsWith("openai/") || id.includes("gpt")
-          effort,
+          ? openaiCompatibleReasoningEfforts(model.api.id)
-          { reasoning: { effort } },
+          : WIDELY_SUPPORTED_EFFORTS
-        ]),
+        ).map((effort) => [effort, { reasoning: { effort } }]),
       )
 
     case "ai-gateway-provider": {
@@ -1202,6 +1201,9 @@ export function smallOptions(model: Provider.Model) {
     return mergeDeep(base, small)
   }
   if (model.providerID === "openrouter" || model.providerID === "llmgateway") {
+    if (model.providerID === "openrouter" && small.reasoning?.effort === "low") {
+      return { reasoning: { effort: "none" } }
+    }
     if (Object.keys(small).length === 0 && model.api.id.includes("google")) {
       return { reasoning: { enabled: false } }
     }

packages/opencode/test/provider/transform.test.ts

@@ -2666,7 +2666,7 @@ describe("ProviderTransform.variants", () => {
   })
 
   describe("@openrouter/ai-sdk-provider", () => {
-    test("returns empty object for non-qualifying models", () => {
+    test("returns widely supported efforts for other reasoning models", () => {
       const model = createMockModel({
         id: "openrouter/test-model",
         providerID: "openrouter",
@@ -2677,7 +2677,8 @@ describe("ProviderTransform.variants", () => {
         },
       })
       const result = ProviderTransform.variants(model)
-      expect(result).toEqual({})
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.medium).toEqual({ reasoning: { effort: "medium" } })
     })
 
     test("gpt models return OPENAI_EFFORTS with reasoning", () => {
@@ -2697,6 +2698,7 @@ describe("ProviderTransform.variants", () => {
     })
 
     for (const testCase of [
+      { id: "openai/o3-mini", efforts: ["none", "minimal", "low", "medium", "high", "xhigh"] },
       { id: "openai/gpt-5.4", efforts: ["none", "low", "medium", "high", "xhigh"] },
       { id: "openai/gpt-5-pro", efforts: ["high"] },
       { id: "openai/gpt-5.5-pro", efforts: ["medium", "high", "xhigh"] },
@@ -2722,7 +2724,7 @@ describe("ProviderTransform.variants", () => {
       })
     }
 
-    test("gemini-3 returns OPENAI_EFFORTS with reasoning", () => {
+    test("gemini-3 returns widely supported efforts with reasoning", () => {
       const model = createMockModel({
         id: "openrouter/gemini-3-5-pro",
         providerID: "openrouter",
@@ -2733,7 +2735,7 @@ describe("ProviderTransform.variants", () => {
         },
       })
       const result = ProviderTransform.variants(model)
-      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high", "xhigh"])
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
     })
 
     test("grok-4 returns empty object", () => {
@@ -3985,6 +3987,23 @@ describe("ProviderTransform.smallOptions - gpt-5 chat/search", () => {
   }
 })
 
+test("ProviderTransform.smallOptions disables OpenRouter reasoning when the weakest effort is low", () => {
+  expect(
+    ProviderTransform.smallOptions({
+      providerID: "openrouter",
+      api: {
+        id: "anthropic/claude-sonnet-4.6",
+        npm: "@openrouter/ai-sdk-provider",
+      },
+      variants: {
+        low: { reasoning: { effort: "low" } },
+        medium: { reasoning: { effort: "medium" } },
+        high: { reasoning: { effort: "high" } },
+      },
+    } as any),
+  ).toEqual({ reasoning: { effort: "none" } })
+})
+
 describe("ProviderTransform.smallOptions - google thinking controls", () => {
   const createGoogleModel = (apiId: string) => {
     const model = {