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Vercel AI SDK

An open-source TypeScript toolkit for building AI apps — unified model API, streaming, structured output, tool calling, and UI hooks.

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Updated Jun 3, 2026
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The Vercel AI SDK is the de facto TypeScript toolkit for AI apps: one provider-agnostic API for text, structured objects, and tool calls, first-class streaming, and framework UI hooks (React, Svelte, Vue) for building chat and generative interfaces fast.

The Vercel AI SDK is an open-source TypeScript toolkit for building AI-powered applications. It gives you one provider-agnostic API for the things every LLM app needs — generating text, generating structured objects, tool calling, and streaming — plus framework hooks for wiring those into a UI. It has become the default way to build AI features in the TypeScript/JavaScript ecosystem.

It is aimed at full-stack and frontend developers who want to ship chat and generative-UI features without gluing together a provider SDK, a streaming layer, and a state library by hand. Swap models with a one-line change, and stream tokens or structured data to the browser with first-class primitives.

Highlights

  • Unified model API — generateText, streamText, generateObject, and tool calling across many providers; change models via config.
  • Streaming-first — stream tokens and structured output to the client with backpressure handled.
  • Structured output — generateObject/streamObject with schema validation (Zod and friends).
  • UI hooks — React, Svelte, and Vue hooks (useChat, useCompletion) for chat and generative interfaces.
  • Tool calling & agents — define tools the model can call, with multi-step loops.

In an AI-assisted workflow

import { streamText } from "ai";
const result = streamText({ model: "anthropic/claude", prompt });
return result.toUIMessageStreamResponse(); // stream straight to the browser

TIP

The AI SDK overlaps with both structured-output libraries and gateways: it does typed output like Instructor and provider-switching like a gateway. Pair it with OpenRouter or LiteLLM when you want centralized routing/cost control behind it.

Good to know

The Vercel AI SDK is open source (Apache-2.0) and free; you pay your model provider for tokens. It's TypeScript-first — the natural choice in JS/TS apps, less so for Python backends (where Instructor/BAML fit better). It's framework-agnostic despite the Vercel name and runs anywhere Node/edge runs.

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