📄 ai-sdk/docs/troubleshooting/timeout-on-vercel
File: timeout-on-vercel.md | Updated: 11/15/2025
Source: https://ai-sdk.dev/docs/troubleshooting/timeout-on-vercel
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v5 (Latest)
AI SDK 5.x
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Client-Side Function Calls Not Invoked
Server Actions in Client Components
useChat/useCompletion stream output contains 0:... instead of text
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Getting Timeouts When Deploying on Vercel
useChat Failed to Parse Stream
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Custom headers, body, and credentials not working with useChat
TypeScript performance issues with Zod and AI SDK 5
Repeated assistant messages in useChat
onFinish not called when stream is aborted
Tool calling with generateObject and streamObject
Abort breaks resumable streams
Streaming Status Shows But No Text Appears
Stale body values with useChat
Unsupported model version error
Object generation failed with OpenAI
Model is not assignable to type "LanguageModelV1"
TypeScript error "Cannot find namespace 'JSX'"
React error "Maximum update depth exceeded"
Jest: cannot find module '@ai-sdk/rsc'
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Getting Timeouts When Deploying on Vercel
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Streaming with the AI SDK works in my local development environment. However, when I'm deploying to Vercel, longer responses get chopped off in the UI and I'm seeing timeouts in the Vercel logs or I'm seeing the error: Uncaught (in promise) Error: Connection closed.
With Vercel's Fluid Compute , the default function duration is now 5 minutes (300 seconds) across all plans. This should be sufficient for most streaming applications.
If you need to extend the timeout for longer-running processes, you can increase the maxDuration setting:
Next.js (App Router)
Add the following to your route file or the page you are calling your Server Action from:
export const maxDuration = 600;
Setting maxDuration above 300 seconds requires a Pro or Enterprise plan.
Other Frameworks
For other frameworks, you can set timeouts in your vercel.json file:
{ "functions": { "api/chat/route.ts": { "maxDuration": 600 } }}
Setting maxDuration above 300 seconds requires a Pro or Enterprise plan.
Maximum Duration Limits
The maximum duration you can set depends on your Vercel plan:
- Hobby: Up to 300 seconds (5 minutes)
- Pro: Up to 800 seconds (~13 minutes)
- Enterprise: Up to 800 seconds (~13 minutes)
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Getting Timeouts When Deploying on Vercel
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