fix(opencode): expose Grok reasoning variants (#36017)

packages/opencode/src/provider/transform.ts

@@ -734,7 +734,6 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
       high: { reasoningEffort: "high" },
     }
   }
-  if (id.includes("grok")) return {}
 
   switch (model.api.npm) {
     case "@openrouter/ai-sdk-provider":

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

@@ -3339,7 +3339,7 @@ describe("ProviderTransform.variants", () => {
       expect(Object.keys(result)).toEqual(["low", "medium", "high"])
     })
 
-    test("grok-4 returns empty object", () => {
+    test("grok-4 uses the provider's standard efforts", () => {
       const model = createMockModel({
         id: "openrouter/grok-4",
         providerID: "openrouter",
@@ -3350,7 +3350,8 @@ 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("grok-3-mini returns low and high with reasoning", () => {
@@ -3766,18 +3767,19 @@ describe("ProviderTransform.variants", () => {
   })
 
   describe("@ai-sdk/xai", () => {
-    test("grok-3 returns empty object", () => {
+    test("grok-4.5 uses standard reasoning efforts", () => {
       const model = createMockModel({
-        id: "xai/grok-3",
+        id: "xai/grok-4.5",
         providerID: "xai",
         api: {
-          id: "grok-3",
+          id: "grok-4.5",
           url: "https://api.x.ai",
           npm: "@ai-sdk/xai",
         },
       })
       const result = ProviderTransform.variants(model)
-      expect(result).toEqual({})
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.medium).toEqual({ reasoningEffort: "medium" })
     })
 
     test("grok-3-mini returns low and high with reasoningEffort", () => {