fix(amazon-bedrock): support inference profile ARNs as model ids

.changeset/bedrock-inference-profile-arn.md

@@ -0,0 +1,5 @@
+---
+"@ai-sdk/amazon-bedrock": patch
+---
+
+fix(amazon-bedrock): support inference profile ARNs as model ids. The provider built request URLs with `encodeURIComponent(modelId)`, which encodes the `/` in an application inference profile ARN (e.g. `arn:aws:bedrock:...:application-inference-profile/abc123`) to `%2F` and made Bedrock reject it with `400 The provided model identifier is invalid`. Model ids are now encoded per path segment so slashes stay literal, matching the path format Bedrock expects.

packages/amazon-bedrock/src/amazon-bedrock-chat-language-model.ts

@@ -41,6 +41,7 @@ import {
   type AmazonBedrockLanguageModelChatOptions,
   type AmazonBedrockChatModelId,
 } from './amazon-bedrock-chat-language-model-options';
+import { encodeModelId } from './amazon-bedrock-encode-model-id';
 import { AmazonBedrockErrorSchema } from './amazon-bedrock-error';
 import { createAmazonBedrockEventStreamResponseHandler } from './amazon-bedrock-event-stream-response-handler';
 import { prepareTools } from './amazon-bedrock-prepare-tools';
@@ -1049,7 +1050,7 @@ export class AmazonBedrockChatLanguageModel implements LanguageModelV4 {
   }
 
   private getUrl(modelId: string) {
-    const encodedModelId = encodeURIComponent(modelId);
+    const encodedModelId = encodeModelId(modelId);
     return `${this.config.baseUrl()}/model/${encodedModelId}`;
   }
 }

packages/amazon-bedrock/src/amazon-bedrock-embedding-model.ts

@@ -19,6 +19,7 @@ import {
   amazonBedrockEmbeddingModelOptionsSchema,
   type AmazonBedrockEmbeddingModelId,
 } from './amazon-bedrock-embedding-model-options';
+import { encodeModelId } from './amazon-bedrock-encode-model-id';
 import { AmazonBedrockErrorSchema } from './amazon-bedrock-error';
 import { z } from 'zod/v4';
 
@@ -59,7 +60,7 @@ export class AmazonBedrockEmbeddingModel implements EmbeddingModelV4 {
   ) {}
 
   private getUrl(modelId: string): string {
-    const encodedModelId = encodeURIComponent(modelId);
+    const encodedModelId = encodeModelId(modelId);
     return `${this.config.baseUrl()}/model/${encodedModelId}/invoke`;
   }
 

packages/amazon-bedrock/src/amazon-bedrock-encode-model-id.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest';
+import { encodeModelId } from './amazon-bedrock-encode-model-id';
+
+describe('encodeModelId', () => {
+  it('encodes a standard model id (colon percent-encoded, no slashes)', () => {
+    expect(encodeModelId('us.amazon.nova-2-lite-v1:0')).toBe(
+      'us.amazon.nova-2-lite-v1%3A0',
+    );
+  });
+
+  it('leaves a plain model id without special characters unchanged', () => {
+    expect(encodeModelId('anthropic.claude-3-haiku-20240307-v1:0')).toBe(
+      'anthropic.claude-3-haiku-20240307-v1%3A0',
+    );
+  });
+
+  it('preserves the slash in an application inference profile ARN', () => {
+    expect(
+      encodeModelId(
+        'arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123xyz',
+      ),
+    ).toBe(
+      'arn%3Aaws%3Abedrock%3Aus-east-1%3A123456789012%3Aapplication-inference-profile/abc123xyz',
+    );
+  });
+
+  it('encodes each segment of a multi-slash path individually', () => {
+    expect(encodeModelId('a b/c:d/e')).toBe('a%20b/c%3Ad/e');
+  });
+});

packages/amazon-bedrock/src/amazon-bedrock-encode-model-id.ts

@@ -0,0 +1,19 @@
+/**
+ * Encodes a Bedrock model identifier for use in a REST API URL path.
+ *
+ * Standard model ids (e.g. `us.amazon.nova-2-lite-v1:0`) contain no slashes and
+ * are encoded as a single segment. Inference profile ARNs, however, contain a
+ * slash (e.g.
+ * `arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123`).
+ * Bedrock's REST API treats the model id as a greedy path label and expects the
+ * slash to stay literal — encoding it to `%2F` (as a plain `encodeURIComponent`
+ * would) makes Bedrock reject the request with
+ * `400 The provided model identifier is invalid`.
+ *
+ * Encoding each `/`-separated segment individually keeps slashes literal while
+ * still percent-encoding every other special character (such as the `:` in an
+ * ARN), matching the path format Bedrock documents for inference profiles.
+ */
+export function encodeModelId(modelId: string): string {
+  return modelId.split('/').map(encodeURIComponent).join('/');
+}

packages/amazon-bedrock/src/amazon-bedrock-image-model.ts

@@ -22,6 +22,7 @@ import {
   type AmazonBedrockImageModelId,
 } from './amazon-bedrock-image-settings';
 import { amazonBedrockImageModelOptionsSchema } from './amazon-bedrock-image-model-options';
+import { encodeModelId } from './amazon-bedrock-encode-model-id';
 import { AmazonBedrockErrorSchema } from './amazon-bedrock-error';
 import { z } from 'zod/v4';
 
@@ -57,7 +58,7 @@ export class AmazonBedrockImageModel implements ImageModelV4 {
   }
 
   private getUrl(modelId: string): string {
-    const encodedModelId = encodeURIComponent(modelId);
+    const encodedModelId = encodeModelId(modelId);
     return `${this.config.baseUrl()}/model/${encodedModelId}/invoke`;
   }
 

packages/amazon-bedrock/src/anthropic/amazon-bedrock-anthropic-provider.ts

@@ -21,6 +21,7 @@ import {
   createSigV4FetchFunction,
   type AmazonBedrockCredentials,
 } from '../amazon-bedrock-sigv4-fetch';
+import { encodeModelId } from '../amazon-bedrock-encode-model-id';
 import { createAmazonBedrockAnthropicFetch } from './amazon-bedrock-anthropic-fetch';
 import type { AmazonBedrockAnthropicModelId } from './amazon-bedrock-anthropic-options';
 import { VERSION } from '../version';
@@ -258,7 +259,7 @@ export function createAmazonBedrockAnthropic(
       fetch: fetchFunction,
 
       buildRequestUrl: (baseURL, isStreaming) =>
-        `${baseURL}/model/${encodeURIComponent(modelId)}/${
+        `${baseURL}/model/${encodeModelId(modelId)}/${
           isStreaming ? 'invoke-with-response-stream' : 'invoke'
         }`,