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 — Technical Overview

AI SDK is an open-source, TypeScript-first library designed as a universal AI layer for building frameworks, agents, and AI-powered applications. It abstracts over 100+ models through the Vercel AI Gateway, giving developers a single, consistent API surface regardless of the underlying model provider.

Key Technical Characteristics

Multi-provider support — route requests across 100+ models via Vercel AI Gateway with built-in fallbacks, eliminating vendor lock-in
Streaming-first architecture — native support for streaming responses, enabling real-time output in UI and server contexts
TypeScript-first — fully typed APIs for type-safe integration across your stack
Framework agnostic — integrates with Next.js, React, Svelte, Angular, Vue, Nuxt, Solid, and Node.js
AI Gateway compatible — works natively with Vercel AI Gateway, Vercel Sandbox, and Workflows
Open source — 27,128 GitHub stars and 725+ contributors
High adoption — 34.5M weekly downloads

Architecture Highlights

Unified API for text generation, streaming, and agent orchestration
Built-in fallback logic for resilient multi-provider routing
Compatible with server-side runtimes (Node.js) and modern frontend frameworks
Free tier available; API access included

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