Vercel AI SDK

Free tier

TypeScript toolkit for building streaming AI chat apps with React and multiple LLM providers

Free·Technical·Powered by Multi-provider (100+ models via Vercel AI Gateway)·API available·Open source

Key strengths

Multi-provider supportStreaming responsesBuilt-in fallbacksAI Gateway compatibleFramework agnosticTypeScript-firstHigh weekly downloads (34.5M)Large contributor base (725+)

Completely free

Founded 2023

Self-hostable

Facts verified against ai-sdk.dev on Oct 6, 2026

Recent changes

Oct 6, 2026API: now available

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AI SDK — Documentation & Developer Resources

AI SDK is open source and API-available, making it straightforward to evaluate, integrate, and extend.

Getting Started

Free tier available — no upfront cost to begin building
API access — full programmatic control over model routing, streaming, and agent orchestration
TypeScript-first — type definitions are built in; no separate @types packages required

Integration Support

AI SDK provides documented integrations for:

Category	Supported Targets
Frontend Frameworks	Next.js, React, Svelte, Angular, Vue, Nuxt, Solid
Backend Runtimes	Node.js
Vercel Ecosystem	Vercel AI Gateway, Vercel Sandbox, Workflows

Core API Capabilities

Multi-provider routing — single API call with automatic provider selection across 100+ models via Vercel AI Gateway
Streaming responses — server-sent events and streaming primitives for real-time output
Built-in fallbacks — configurable fallback chains for resilient production deployments
Agent support — primitives for building autonomous AI agents and multi-step workflows

Open Source

GitHub stars: 27,128
Contributors: 725+
Weekly downloads: 34.5M
Founded: 2023

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