feat: bump bedrock and add proper mantle support for openai models through aws bedrock (#30464)

packages/opencode/test/provider/amazon-bedrock.test.ts

@@ -33,6 +33,20 @@ afterEach(async () => {
 
 const list = Provider.use.list()
 
+const mantleModelConfig = {
+  provider: { npm: "@ai-sdk/amazon-bedrock/mantle" },
+  limit: { context: 272_000, output: 32_000 },
+  modalities: {
+    input: ["text", "image", "pdf"] as Array<"text" | "image" | "pdf">,
+    output: ["text"] as Array<"text">,
+  },
+}
+
+const mantleOpenAIModelConfig = {
+  ...mantleModelConfig,
+  provider: { npm: "@ai-sdk/amazon-bedrock/mantle", api: "https://bedrock-mantle.us-east-2.api.aws/openai/v1" },
+}
+
 const withAuthJson = (contents: string) =>
   Effect.acquireRelease(
     Effect.promise(async () => {
@@ -94,6 +108,65 @@ it.instance(
   { config: { provider: { "amazon-bedrock": { options: { region: "eu-west-1" } } } } },
 )
 
+it.instance(
+  "Bedrock Mantle: GPT-5.5 uses Responses API and OpenAI base path",
+  () =>
+    Effect.gen(function* () {
+      yield* set("AWS_BEARER_TOKEN_BEDROCK", "test-bearer-token")
+      const model = yield* Provider.use.getModel(ProviderV2.ID.amazonBedrock, ProviderV2.ModelID.make("openai.gpt-5.5"))
+      const language = yield* Provider.use.getLanguage(model)
+      expect((language as { provider: string }).provider).toBe("bedrock-mantle.responses")
+      expect((language as { modelId: string }).modelId).toBe("openai.gpt-5.5")
+      expect(
+        (language as unknown as { config: { url: (input: { path: string; modelId: string }) => string } }).config.url({
+          path: "/responses",
+          modelId: "openai.gpt-5.5",
+        }),
+      ).toBe("https://bedrock-mantle.us-east-2.api.aws/openai/v1/responses")
+    }),
+  {
+    config: {
+      provider: {
+        "amazon-bedrock": {
+          options: { region: "us-east-2" },
+          models: { "openai.gpt-5.5": mantleOpenAIModelConfig },
+        },
+      },
+    },
+  },
+)
+
+it.instance(
+  "Bedrock Mantle: GPT OSS safeguard uses Chat Completions and Mantle base path",
+  () =>
+    Effect.gen(function* () {
+      yield* set("AWS_BEARER_TOKEN_BEDROCK", "test-bearer-token")
+      const model = yield* Provider.use.getModel(
+        ProviderV2.ID.amazonBedrock,
+        ProviderV2.ModelID.make("openai.gpt-oss-safeguard-120b"),
+      )
+      const language = yield* Provider.use.getLanguage(model)
+      expect((language as { provider: string }).provider).toBe("bedrock-mantle.chat")
+      expect((language as { modelId: string }).modelId).toBe("openai.gpt-oss-safeguard-120b")
+      expect(
+        (language as unknown as { config: { url: (input: { path: string; modelId: string }) => string } }).config.url({
+          path: "/chat/completions",
+          modelId: "openai.gpt-oss-safeguard-120b",
+        }),
+      ).toBe("https://bedrock-mantle.us-east-1.api.aws/v1/chat/completions")
+    }),
+  {
+    config: {
+      provider: {
+        "amazon-bedrock": {
+          options: { region: "us-east-1" },
+          models: { "openai.gpt-oss-safeguard-120b": mantleModelConfig },
+        },
+      },
+    },
+  },
+)
+
 it.instance(
   "Bedrock: config profile takes precedence over AWS_PROFILE env var",
   () =>

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

@@ -274,6 +274,25 @@ describe("ProviderTransform.options - gpt-5 textVerbosity", () => {
     expect(result.include).toEqual(["reasoning.encrypted_content"])
   })
 
+  test("Bedrock Mantle gpt-5.5 uses OpenAI Responses defaults", () => {
+    const model = {
+      ...createGpt5Model("openai.gpt-5.5"),
+      id: "amazon-bedrock/openai.gpt-5.5",
+      providerID: "amazon-bedrock",
+      api: {
+        id: "openai.gpt-5.5",
+        url: "https://bedrock-mantle.us-east-2.api.aws/openai/v1",
+        npm: "@ai-sdk/amazon-bedrock/mantle",
+      },
+    }
+    const result = ProviderTransform.options({ model, sessionID, providerOptions: {} })
+    expect(result.store).toBe(false)
+    expect(result.reasoningEffort).toBe("medium")
+    expect(result.reasoningSummary).toBe("auto")
+    expect(result.include).toEqual(["reasoning.encrypted_content"])
+    expect(result.textVerbosity).toBe("low")
+  })
+
   test("gpt-5.1 should have textVerbosity set to low", () => {
     const model = createGpt5Model("gpt-5.1")
     const result = ProviderTransform.options({ model, sessionID, providerOptions: {} })
@@ -562,6 +581,21 @@ describe("ProviderTransform.providerOptions", () => {
     })
   })
 
+  test("maps Bedrock Mantle provider options to OpenAI namespace", () => {
+    const model = createModel({
+      providerID: "amazon-bedrock",
+      api: {
+        id: "openai.gpt-5.5",
+        url: "https://bedrock-mantle.us-east-2.api.aws/openai/v1",
+        npm: "@ai-sdk/amazon-bedrock/mantle",
+      },
+    })
+
+    expect(ProviderTransform.providerOptions(model, { reasoningEffort: "medium" })).toEqual({
+      openai: { reasoningEffort: "medium" },
+    })
+  })
+
   test("uses groq slug for groq models", () => {
     const model = createModel({
       providerID: "vercel",
@@ -3163,6 +3197,28 @@ describe("ProviderTransform.variants", () => {
     })
   })
 
+  describe("@ai-sdk/amazon-bedrock/mantle", () => {
+    test("gpt-5.5 returns OpenAI-style reasoning variants", () => {
+      const model = createMockModel({
+        id: "openai.gpt-5.5",
+        providerID: "amazon-bedrock",
+        api: {
+          id: "openai.gpt-5.5",
+          url: "https://bedrock-mantle.us-east-2.api.aws/openai/v1",
+          npm: "@ai-sdk/amazon-bedrock/mantle",
+        },
+        release_date: "2026-04-23",
+      })
+      const result = ProviderTransform.variants(model)
+      expect(Object.keys(result)).toEqual(["none", "low", "medium", "high", "xhigh"])
+      expect(result.medium).toEqual({
+        reasoningEffort: "medium",
+        reasoningSummary: "auto",
+        include: ["reasoning.encrypted_content"],
+      })
+    })
+  })
+
   describe("@ai-sdk/anthropic", () => {
     for (const testCase of [
       {