1 files changed, 569 insertions, 0 deletions
diff --git a/packages/opencode/test/provider/transform.test.ts b/packages/opencode/test/provider/transform.test.ts
index 78bd296c9..59041b09f 100644
--- a/packages/opencode/test/provider/transform.test.ts
+++ b/packages/opencode/test/provider/transform.test.ts
@@ -409,3 +409,572 @@ describe("ProviderTransform.message - empty image handling", () => {
     })
   })
 })
+
+describe("ProviderTransform.variants", () => {
+  const createMockModel = (overrides: Partial<any> = {}): any => ({
+    id: "test/test-model",
+    providerID: "test",
+    api: {
+      id: "test-model",
+      url: "https://api.test.com",
+      npm: "@ai-sdk/openai",
+    },
+    name: "Test Model",
+    capabilities: {
+      temperature: true,
+      reasoning: true,
+      attachment: true,
+      toolcall: true,
+      input: { text: true, audio: false, image: true, video: false, pdf: false },
+      output: { text: true, audio: false, image: false, video: false, pdf: false },
+      interleaved: false,
+    },
+    cost: {
+      input: 0.001,
+      output: 0.002,
+      cache: { read: 0.0001, write: 0.0002 },
+    },
+    limit: {
+      context: 128000,
+      output: 8192,
+    },
+    status: "active",
+    options: {},
+    headers: {},
+    release_date: "2024-01-01",
+    ...overrides,
+  })
+
+  test("returns empty object when model has no reasoning capabilities", () => {
+    const model = createMockModel({
+      capabilities: { reasoning: false },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(result).toEqual({})
+  })
+
+  test("deepseek returns empty object", () => {
+    const model = createMockModel({
+      id: "deepseek/deepseek-chat",
+      providerID: "deepseek",
+      api: {
+        id: "deepseek-chat",
+        url: "https://api.deepseek.com",
+        npm: "@ai-sdk/openai-compatible",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(result).toEqual({})
+  })
+
+  test("minimax returns empty object", () => {
+    const model = createMockModel({
+      id: "minimax/minimax-model",
+      providerID: "minimax",
+      api: {
+        id: "minimax-model",
+        url: "https://api.minimax.com",
+        npm: "@ai-sdk/openai-compatible",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(result).toEqual({})
+  })
+
+  test("glm returns empty object", () => {
+    const model = createMockModel({
+      id: "glm/glm-4",
+      providerID: "glm",
+      api: {
+        id: "glm-4",
+        url: "https://api.glm.com",
+        npm: "@ai-sdk/openai-compatible",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(result).toEqual({})
+  })
+
+  test("mistral returns empty object", () => {
+    const model = createMockModel({
+      id: "mistral/mistral-large",
+      providerID: "mistral",
+      api: {
+        id: "mistral-large-latest",
+        url: "https://api.mistral.com",
+        npm: "@ai-sdk/mistral",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(result).toEqual({})
+  })
+
+  describe("@openrouter/ai-sdk-provider", () => {
+    test("returns empty object for non-qualifying models", () => {
+      const model = createMockModel({
+        id: "openrouter/test-model",
+        providerID: "openrouter",
+        api: {
+          id: "test-model",
+          url: "https://openrouter.ai",
+          npm: "@openrouter/ai-sdk-provider",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(result).toEqual({})
+    })
+
+    test("gpt models return OPENAI_EFFORTS with reasoning", () => {
+      const model = createMockModel({
+        id: "openrouter/gpt-4",
+        providerID: "openrouter",
+        api: {
+          id: "gpt-4",
+          url: "https://openrouter.ai",
+          npm: "@openrouter/ai-sdk-provider",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high", "xhigh"])
+      expect(result.low).toEqual({ reasoning: { effort: "low" } })
+      expect(result.high).toEqual({ reasoning: { effort: "high" } })
+    })
+
+    test("gemini-3 returns OPENAI_EFFORTS with reasoning", () => {
+      const model = createMockModel({
+        id: "openrouter/gemini-3-5-pro",
+        providerID: "openrouter",
+        api: {
+          id: "gemini-3-5-pro",
+          url: "https://openrouter.ai",
+          npm: "@openrouter/ai-sdk-provider",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high", "xhigh"])
+    })
+
+    test("grok-4 returns OPENAI_EFFORTS with reasoning", () => {
+      const model = createMockModel({
+        id: "openrouter/grok-4",
+        providerID: "openrouter",
+        api: {
+          id: "grok-4",
+          url: "https://openrouter.ai",
+          npm: "@openrouter/ai-sdk-provider",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high", "xhigh"])
+    })
+  })
+
+  describe("@ai-sdk/gateway", () => {
+    test("returns OPENAI_EFFORTS with reasoningEffort", () => {
+      const model = createMockModel({
+        id: "gateway/gateway-model",
+        providerID: "gateway",
+        api: {
+          id: "gateway-model",
+          url: "https://gateway.ai",
+          npm: "@ai-sdk/gateway",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high", "xhigh"])
+      expect(result.low).toEqual({ reasoningEffort: "low" })
+      expect(result.high).toEqual({ reasoningEffort: "high" })
+    })
+  })
+
+  describe("@ai-sdk/cerebras", () => {
+    test("returns WIDELY_SUPPORTED_EFFORTS with reasoningEffort", () => {
+      const model = createMockModel({
+        id: "cerebras/llama-4",
+        providerID: "cerebras",
+        api: {
+          id: "llama-4-sc",
+          url: "https://api.cerebras.ai",
+          npm: "@ai-sdk/cerebras",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({ reasoningEffort: "low" })
+      expect(result.high).toEqual({ reasoningEffort: "high" })
+    })
+  })
+
+  describe("@ai-sdk/togetherai", () => {
+    test("returns WIDELY_SUPPORTED_EFFORTS with reasoningEffort", () => {
+      const model = createMockModel({
+        id: "togetherai/llama-4",
+        providerID: "togetherai",
+        api: {
+          id: "llama-4-sc",
+          url: "https://api.togetherai.com",
+          npm: "@ai-sdk/togetherai",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({ reasoningEffort: "low" })
+      expect(result.high).toEqual({ reasoningEffort: "high" })
+    })
+  })
+
+  describe("@ai-sdk/xai", () => {
+    test("returns WIDELY_SUPPORTED_EFFORTS with reasoningEffort", () => {
+      const model = createMockModel({
+        id: "xai/grok-3",
+        providerID: "xai",
+        api: {
+          id: "grok-3",
+          url: "https://api.x.ai",
+          npm: "@ai-sdk/xai",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({ reasoningEffort: "low" })
+      expect(result.high).toEqual({ reasoningEffort: "high" })
+    })
+  })
+
+  describe("@ai-sdk/deepinfra", () => {
+    test("returns WIDELY_SUPPORTED_EFFORTS with reasoningEffort", () => {
+      const model = createMockModel({
+        id: "deepinfra/llama-4",
+        providerID: "deepinfra",
+        api: {
+          id: "llama-4-sc",
+          url: "https://api.deepinfra.com",
+          npm: "@ai-sdk/deepinfra",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({ reasoningEffort: "low" })
+      expect(result.high).toEqual({ reasoningEffort: "high" })
+    })
+  })
+
+  describe("@ai-sdk/openai-compatible", () => {
+    test("returns WIDELY_SUPPORTED_EFFORTS with reasoningEffort", () => {
+      const model = createMockModel({
+        id: "custom-provider/custom-model",
+        providerID: "custom-provider",
+        api: {
+          id: "custom-model",
+          url: "https://api.custom.com",
+          npm: "@ai-sdk/openai-compatible",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({ reasoningEffort: "low" })
+      expect(result.high).toEqual({ reasoningEffort: "high" })
+    })
+  })
+
+  describe("@ai-sdk/azure", () => {
+    test("o1-mini returns empty object", () => {
+      const model = createMockModel({
+        id: "o1-mini",
+        providerID: "azure",
+        api: {
+          id: "o1-mini",
+          url: "https://azure.com",
+          npm: "@ai-sdk/azure",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(result).toEqual({})
+    })
+
+    test("standard azure models return custom efforts with reasoningSummary", () => {
+      const model = createMockModel({
+        id: "azure/gpt-4o",
+        providerID: "azure",
+        api: {
+          id: "gpt-4o",
+          url: "https://azure.com",
+          npm: "@ai-sdk/azure",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({
+        reasoningEffort: "low",
+        reasoningSummary: "auto",
+        include: ["reasoning.encrypted_content"],
+      })
+    })
+
+    test("gpt-5 adds minimal effort", () => {
+      const model = createMockModel({
+        id: "azure/gpt-5",
+        providerID: "azure",
+        api: {
+          id: "gpt-5",
+          url: "https://azure.com",
+          npm: "@ai-sdk/azure",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["minimal", "low", "medium", "high"])
+    })
+  })
+
+  describe("@ai-sdk/openai", () => {
+    test("gpt-5-pro returns empty object", () => {
+      const model = createMockModel({
+        id: "gpt-5-pro",
+        providerID: "openai",
+        api: {
+          id: "gpt-5-pro",
+          url: "https://api.openai.com",
+          npm: "@ai-sdk/openai",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(result).toEqual({})
+    })
+
+    test("standard openai models return custom efforts with reasoningSummary", () => {
+      const model = createMockModel({
+        id: "openai/gpt-4o",
+        providerID: "openai",
+        api: {
+          id: "gpt-4o",
+          url: "https://api.openai.com",
+          npm: "@ai-sdk/openai",
+        },
+        release_date: "2024-06-01",
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["minimal", "low", "medium", "high"])
+      expect(result.low).toEqual({
+        reasoningEffort: "low",
+        reasoningSummary: "auto",
+        include: ["reasoning.encrypted_content"],
+      })
+    })
+
+    test("models after 2025-11-13 include 'none' effort", () => {
+      const model = createMockModel({
+        id: "openai/gpt-4.5",
+        providerID: "openai",
+        api: {
+          id: "gpt-4.5",
+          url: "https://api.openai.com",
+          npm: "@ai-sdk/openai",
+        },
+        release_date: "2025-11-14",
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high"])
+    })
+
+    test("models after 2025-12-04 include 'xhigh' effort", () => {
+      const model = createMockModel({
+        id: "openai/gpt-5-chat",
+        providerID: "openai",
+        api: {
+          id: "gpt-5-chat",
+          url: "https://api.openai.com",
+          npm: "@ai-sdk/openai",
+        },
+        release_date: "2025-12-05",
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "minimal", "low", "medium", "high", "xhigh"])
+    })
+  })
+
+  describe("@ai-sdk/anthropic", () => {
+    test("returns high and max with thinking config", () => {
+      const model = createMockModel({
+        id: "anthropic/claude-4",
+        providerID: "anthropic",
+        api: {
+          id: "claude-4",
+          url: "https://api.anthropic.com",
+          npm: "@ai-sdk/anthropic",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["high", "max"])
+      expect(result.high).toEqual({
+        thinking: {
+          type: "enabled",
+          budgetTokens: 16000,
+        },
+      })
+      expect(result.max).toEqual({
+        thinking: {
+          type: "enabled",
+          budgetTokens: 31999,
+        },
+      })
+    })
+  })
+
+  describe("@ai-sdk/amazon-bedrock", () => {
+    test("returns WIDELY_SUPPORTED_EFFORTS with reasoningConfig", () => {
+      const model = createMockModel({
+        id: "bedrock/llama-4",
+        providerID: "bedrock",
+        api: {
+          id: "llama-4-sc",
+          url: "https://bedrock.amazonaws.com",
+          npm: "@ai-sdk/amazon-bedrock",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "medium", "high"])
+      expect(result.low).toEqual({
+        reasoningConfig: {
+          type: "enabled",
+          maxReasoningEffort: "low",
+        },
+      })
+    })
+  })
+
+  describe("@ai-sdk/google", () => {
+    test("gemini-2.5 returns high and max with thinkingConfig and thinkingBudget", () => {
+      const model = createMockModel({
+        id: "google/gemini-2.5-pro",
+        providerID: "google",
+        api: {
+          id: "gemini-2.5-pro",
+          url: "https://generativelanguage.googleapis.com",
+          npm: "@ai-sdk/google",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["high", "max"])
+      expect(result.high).toEqual({
+        thinkingConfig: {
+          includeThoughts: true,
+          thinkingBudget: 16000,
+        },
+      })
+      expect(result.max).toEqual({
+        thinkingConfig: {
+          includeThoughts: true,
+          thinkingBudget: 24576,
+        },
+      })
+    })
+
+    test("other gemini models return low and high with thinkingLevel", () => {
+      const model = createMockModel({
+        id: "google/gemini-2.0-pro",
+        providerID: "google",
+        api: {
+          id: "gemini-2.0-pro",
+          url: "https://generativelanguage.googleapis.com",
+          npm: "@ai-sdk/google",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "high"])
+      expect(result.low).toEqual({
+        includeThoughts: true,
+        thinkingLevel: "low",
+      })
+      expect(result.high).toEqual({
+        includeThoughts: true,
+        thinkingLevel: "high",
+      })
+    })
+  })
+
+  describe("@ai-sdk/google-vertex", () => {
+    test("gemini-2.5 returns high and max with thinkingConfig and thinkingBudget", () => {
+      const model = createMockModel({
+        id: "google-vertex/gemini-2.5-pro",
+        providerID: "google-vertex",
+        api: {
+          id: "gemini-2.5-pro",
+          url: "https://vertexai.googleapis.com",
+          npm: "@ai-sdk/google-vertex",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["high", "max"])
+    })
+
+    test("other vertex models return low and high with thinkingLevel", () => {
+      const model = createMockModel({
+        id: "google-vertex/gemini-2.0-pro",
+        providerID: "google-vertex",
+        api: {
+          id: "gemini-2.0-pro",
+          url: "https://vertexai.googleapis.com",
+          npm: "@ai-sdk/google-vertex",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["low", "high"])
+    })
+  })
+
+  describe("@ai-sdk/cohere", () => {
+    test("returns empty object", () => {
+      const model = createMockModel({
+        id: "cohere/command-r",
+        providerID: "cohere",
+        api: {
+          id: "command-r",
+          url: "https://api.cohere.com",
+          npm: "@ai-sdk/cohere",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(result).toEqual({})
+    })
+  })
+
+  describe("@ai-sdk/groq", () => {
+    test("returns none and WIDELY_SUPPORTED_EFFORTS with thinkingLevel", () => {
+      const model = createMockModel({
+        id: "groq/llama-4",
+        providerID: "groq",
+        api: {
+          id: "llama-4-sc",
+          url: "https://api.groq.com",
+          npm: "@ai-sdk/groq",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "low", "medium", "high"])
+      expect(result.none).toEqual({
+        includeThoughts: true,
+        thinkingLevel: "none",
+      })
+      expect(result.low).toEqual({
+        includeThoughts: true,
+        thinkingLevel: "low",
+      })
+    })
+  })
+
+  describe("@ai-sdk/perplexity", () => {
+    test("returns empty object", () => {
+      const model = createMockModel({
+        id: "perplexity/sonar-plus",
+        providerID: "perplexity",
+        api: {
+          id: "sonar-plus",
+          url: "https://api.perplexity.ai",
+          npm: "@ai-sdk/perplexity",
+        },
+      })
+      const result = ProviderTransform.variants(model)
+      expect(result).toEqual({})
+    })
+  })
+})