From 767115cd6944c22ab8fce82f02da7e9578d139b2 Mon Sep 17 00:00:00 2001
From: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Date: Wed, 26 Aug 2026 16:47:39 -0500
Subject: [PATCH] fix(ai): default native Mantle to Responses (#45394)

---
 packages/ai/src/providers/amazon-bedrock-mantle.ts |  4 ++--
 packages/ai/src/providers/amazon-bedrock/mantle.ts |  2 +-
 packages/ai/test/provider/bedrock-mantle.test.ts   | 14 +++++++++-----
 packages/core/test/aisdk-native.test.ts            |  8 +++++---
 4 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/packages/ai/src/providers/amazon-bedrock-mantle.ts b/packages/ai/src/providers/amazon-bedrock-mantle.ts
index af7163ceeaf..a36d3eacefd 100644
--- a/packages/ai/src/providers/amazon-bedrock-mantle.ts
+++ b/packages/ai/src/providers/amazon-bedrock-mantle.ts
@@ -78,7 +78,7 @@ export const configure = (input: Config = {}) => {
 
   return {
     id,
-    model: chat,
+    model: responses,
     chat,
     responses,
     configure,
@@ -112,4 +112,4 @@ export const responsesModel: ProviderPackage.Definition<Settings, OpenAIProvider
   modelID,
   settings,
 ) => configure(config(settings)).responses(modelID)
-export const model = chatModel
+export const model = responsesModel
diff --git a/packages/ai/src/providers/amazon-bedrock/mantle.ts b/packages/ai/src/providers/amazon-bedrock/mantle.ts
index 9916ebe87d0..9672d74f2b3 100644
--- a/packages/ai/src/providers/amazon-bedrock/mantle.ts
+++ b/packages/ai/src/providers/amazon-bedrock/mantle.ts
@@ -1,2 +1,2 @@
-export { chatModel as model } from "../amazon-bedrock-mantle.js"
+export { responsesModel as model } from "../amazon-bedrock-mantle.js"
 export type { Settings } from "../amazon-bedrock-mantle.js"
diff --git a/packages/ai/test/provider/bedrock-mantle.test.ts b/packages/ai/test/provider/bedrock-mantle.test.ts
index c82ae03aa2b..0c11de31f3f 100644
--- a/packages/ai/test/provider/bedrock-mantle.test.ts
+++ b/packages/ai/test/provider/bedrock-mantle.test.ts
@@ -3,6 +3,7 @@ import { Effect } from "effect"
 import { HttpClientRequest } from "effect/unstable/http"
 import { LLM, Message } from "../../src/index.js"
 import { AmazonBedrockMantle } from "../../src/providers.js"
+import { model } from "../../src/providers/amazon-bedrock/mantle.js"
 import { OpenAIResponses } from "../../src/protocols/openai-responses.js"
 import { compileRequest, LLMClient } from "../../src/route/client.js"
 import { it } from "../lib/effect.js"
@@ -17,13 +18,16 @@ const credentials = {
 }
 
 describe("Amazon Bedrock Mantle provider", () => {
-  it.effect("uses Chat by default and exposes Responses", () =>
+  it.effect("uses Responses by default and exposes Chat explicitly", () =>
     Effect.gen(function* () {
       const provider = AmazonBedrockMantle.configure({ credentials })
-      expect(provider.responses("openai.gpt-oss-120b").route.transport).toBe(OpenAIResponses.httpTransport)
-      const chat = yield* compileRequest(LLM.request({ model: provider.model("openai.gpt-oss-120b"), prompt: "Hi" }))
+      expect(provider.model).toBe(provider.responses)
+      expect(AmazonBedrockMantle.model).toBe(AmazonBedrockMantle.responsesModel)
+      expect(model).toBe(AmazonBedrockMantle.responsesModel)
+      expect(provider.model("openai.gpt-oss-120b").route.transport).toBe(OpenAIResponses.httpTransport)
+      const chat = yield* compileRequest(LLM.request({ model: provider.chat("openai.gpt-oss-120b"), prompt: "Hi" }))
       const responses = yield* compileRequest(
-        LLM.request({ model: provider.responses("openai.gpt-oss-120b"), prompt: "Hi" }),
+        LLM.request({ model: provider.model("openai.gpt-oss-120b"), prompt: "Hi" }),
       )
 
       expect(chat).toMatchObject({
@@ -37,7 +41,7 @@ describe("Amazon Bedrock Mantle provider", () => {
         body: { model: "openai.gpt-oss-120b", store: false },
       })
       expect(provider.model("openai.gpt-oss-120b").route.providerMetadataKey).toBe("mantle")
-      expect(provider.responses("openai.gpt-oss-120b").route.providerMetadataKey).toBe("mantle")
+      expect(provider.chat("openai.gpt-oss-120b").route.providerMetadataKey).toBe("mantle")
     }),
   )
 
diff --git a/packages/core/test/aisdk-native.test.ts b/packages/core/test/aisdk-native.test.ts
index 4456b8e5f35..9de62931efd 100644
--- a/packages/core/test/aisdk-native.test.ts
+++ b/packages/core/test/aisdk-native.test.ts
@@ -222,9 +222,11 @@ describe("AISDKNative", () => {
       },
       headers: { "x-test": "value" },
     })
-    expect(map("@ai-sdk/amazon-bedrock/mantle", settings, "openai.gpt-oss-safeguard-20b")?.package).toBe(
-      "@opencode-ai/ai/providers/amazon-bedrock/mantle/chat",
-    )
+    for (const modelID of ["openai.gpt-oss-safeguard-20b", "openai.gpt-oss-safeguard-120b"]) {
+      expect(map("@ai-sdk/amazon-bedrock/mantle", settings, modelID)?.package).toBe(
+        "@opencode-ai/ai/providers/amazon-bedrock/mantle/chat",
+      )
+    }
     expect(
       map(
         "@ai-sdk/amazon-bedrock/mantle",