Vercel AI SDK

The AI SDK is an open-source TypeScript toolkit from Vercel for calling LLMs through one API across many providers. It covers text and structured generation, tool calling, agents, and UI hooks such as useChat for React, Next.js, Vue and Svelte.

Website Docs Changelog Compare with others

Vercel AI SDK at a glance

From official pages, checked Sep 29, 2026. Tap the arrow for each source.

Free tier: Free & open source
Free open-source TypeScript library; Vercel AI Gateway adds a monthly free credit on select models.
Starting price: Free, open source
Optional AI Gateway is pay-as-you-go at provider list price with no markup or platform fee.
Rate limit: Lower per-model limits (free)
AI Gateway free tier; buying credits moves to paid tier with no gateway rate limits.
Official SDKs: JavaScript / TypeScript
Open source: Yes
Apache 2.0 licence
Trains on your data: No
Runs in your own code
Compliance: SOC 2ISO 27001GDPRHIPAA

What you can build with Vercel AI SDK

Vercel AI SDKRecipeBuild

Add a streaming chat UI to Next.js with the AI SDK useChat hook

Stream LLM replies into a Next.js App Router page using useChat and a streamText route handler (AI SDK 7).

Free tier: Free & open sourceFree, open source

Chat

Vercel AI SDK at a glance

What you can build with Vercel AI SDK

Add a streaming chat UI to Next.js with the AI SDK useChat hook

Update timeline