chore(web): upgrade Vercel AI SDK from v5 to v6 (#969)

* chore(web): upgrade Vercel AI SDK from v5 to v6

- Update `ai` from ^5.0.121 to ^6.0.105
- Update all @ai-sdk/* provider packages to their latest major versions
- Update @openrouter/ai-sdk-provider from ^1.5.4 to ^2.2.3
- Rename LanguageModelV2 -> LanguageModelV3 per v6 API changes
- Fix google-vertex thinking config provider options key (google -> vertex)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* chore: update CHANGELOG for AI SDK v6 upgrade

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* changelog

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brendan-kellam

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Upgraded Vercel AI SDK from v5 to v6. [#969](https://github.com/sourcebot-dev/sourcebot/pull/969)
+
 ## [4.13.1] - 2026-02-28
 
 ### Changed

packages/web/package.json

@@ -14,17 +14,17 @@
     "tool:decrypt-jwe": "tsx tools/decryptJWE.ts"
   },
   "dependencies": {
-    "@ai-sdk/amazon-bedrock": "^3.0.73",
-    "@ai-sdk/anthropic": "^2.0.57",
-    "@ai-sdk/azure": "^2.0.91",
-    "@ai-sdk/deepseek": "^1.0.33",
-    "@ai-sdk/google": "^2.0.52",
-    "@ai-sdk/google-vertex": "^3.0.97",
-    "@ai-sdk/mistral": "^2.0.27",
-    "@ai-sdk/openai": "^2.0.89",
-    "@ai-sdk/openai-compatible": "^1.0.30",
-    "@ai-sdk/react": "^2.0.123",
-    "@ai-sdk/xai": "^2.0.53",
+    "@ai-sdk/amazon-bedrock": "^4.0.69",
+    "@ai-sdk/anthropic": "^3.0.50",
+    "@ai-sdk/azure": "^3.0.38",
+    "@ai-sdk/deepseek": "^2.0.21",
+    "@ai-sdk/google": "^3.0.34",
+    "@ai-sdk/google-vertex": "^4.0.68",
+    "@ai-sdk/mistral": "^3.0.21",
+    "@ai-sdk/openai": "^3.0.37",
+    "@ai-sdk/openai-compatible": "^2.0.31",
+    "@ai-sdk/react": "^3.0.107",
+    "@ai-sdk/xai": "^3.0.60",
     "@auth/prisma-adapter": "^2.11.1",
     "@aws-sdk/credential-providers": "^3.1000.0",
     "@codemirror/commands": "^6.6.0",
@@ -59,7 +59,7 @@
     "@hookform/resolvers": "^3.9.0",
     "@iconify/react": "^5.1.0",
     "@iizukak/codemirror-lang-wgsl": "^0.3.0",
-    "@openrouter/ai-sdk-provider": "^1.5.4",
+    "@openrouter/ai-sdk-provider": "^2.2.3",
     "@opentelemetry/api-logs": "^0.203.0",
     "@opentelemetry/instrumentation": "^0.203.0",
     "@opentelemetry/sdk-logs": "^0.203.0",
@@ -112,7 +112,7 @@
     "@vercel/otel": "^1.13.0",
     "@viz-js/lang-dot": "^1.0.4",
     "@xiechao/codemirror-lang-handlebars": "^1.0.4",
-    "ai": "^5.0.121",
+    "ai": "^6.0.105",
     "ajv": "^8.17.1",
     "bcryptjs": "^3.0.2",
     "class-variance-authority": "^0.7.0",

packages/web/src/app/api/(server)/chat/route.ts

@@ -8,7 +8,7 @@ import { ErrorCode } from "@/lib/errorCodes";
 import { notFound, requestBodySchemaValidationError, ServiceError, serviceErrorResponse } from "@/lib/serviceError";
 import { isServiceError } from "@/lib/utils";
 import { withOptionalAuthV2 } from "@/withAuthV2";
-import { LanguageModelV2 as AISDKLanguageModelV2 } from "@ai-sdk/provider";
+import { LanguageModelV3 as AISDKLanguageModelV3 } from "@ai-sdk/provider";
 import * as Sentry from "@sentry/nextjs";
 import { createLogger, env } from "@sourcebot/shared";
 import { captureEvent } from "@/lib/posthog";
@@ -167,7 +167,7 @@ interface CreateMessageStreamResponseProps {
     chatId: string;
     messages: SBChatMessage[];
     selectedRepos: string[];
-    model: AISDKLanguageModelV2;
+    model: AISDKLanguageModelV3;
     modelName: string;
     onFinish: UIMessageStreamOnFinishCallback<SBChatMessage>;
     onError: (error: unknown) => string;

packages/web/src/features/chat/actions.ts

@@ -14,7 +14,7 @@ import { createVertexAnthropic } from '@ai-sdk/google-vertex/anthropic';
 import { createMistral } from '@ai-sdk/mistral';
 import { createOpenAI, OpenAIResponsesProviderOptions } from "@ai-sdk/openai";
 import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
-import { LanguageModelV2 as AISDKLanguageModelV2 } from "@ai-sdk/provider";
+import { LanguageModelV3 as AISDKLanguageModelV3 } from "@ai-sdk/provider";
 import { createXai } from '@ai-sdk/xai';
 import { fromNodeProviderChain } from '@aws-sdk/credential-providers';
 import { createOpenRouter } from '@openrouter/ai-sdk-provider';
@@ -721,13 +721,13 @@ export const _getConfiguredLanguageModelsFull = async (): Promise<LanguageModel[
 }
 
 export const _getAISDKLanguageModelAndOptions = async (config: LanguageModel): Promise<{
-    model: AISDKLanguageModelV2,
+    model: AISDKLanguageModelV3,
     providerOptions?: Record<string, Record<string, JSONValue>>,
 }> => {
     const { provider, model: modelId } = config;
 
     const { model: _model, providerOptions } = await (async (): Promise<{
-        model: AISDKLanguageModelV2,
+        model: AISDKLanguageModelV3,
         providerOptions?: Record<string, Record<string, JSONValue>>,
     }> => {
         switch (provider) {
@@ -841,7 +841,7 @@ export const _getAISDKLanguageModelAndOptions = async (config: LanguageModel): P
                 return {
                     model: vertex(modelId),
                     providerOptions: {
-                        google: {
+                        vertex: {
                             thinkingConfig: {
                                 thinkingBudget: env.GOOGLE_VERTEX_THINKING_BUDGET_TOKENS,
                                 includeThoughts: env.GOOGLE_VERTEX_INCLUDE_THOUGHTS === 'true',