AI-SDK
FreeThe toolkit for building AI-powered web apps.
The Vercel AI SDK is an open-source TypeScript toolkit for building AI-powered applications and agents. It provides a unified API to interact with over 100 language models from 25+ providers, with built-in streaming, structured output generation, tool calling, and framework-agnostic UI hooks.
What is it
The Vercel AI SDK is a comprehensive open-source library designed to help developers build high-performance AI applications and agents. It offers three main modules — AI SDK Core for model interaction, AI SDK UI for frontend integration, and AI SDK RSC for React Server Components — all built on a provider-agnostic architecture that abstracts differences between AI model vendors.
What it can do
Generate and stream text, structured objects, embeddings, images, speech, and video through a standardized API. Build interactive chat interfaces with `useChat`, `useCompletion`, and `useObject` hooks. Implement tool calling and MCP (Model Context Protocol) integrations for agents. Switch between OpenAI, Anthropic, Google, Mistral, and dozens of other providers with a single line of code. Validate outputs with Zod, Valibot, or JSON Schema for type-safe AI interactions.
Who is it for
Frontend and full-stack developers building AI chatbots, generative UI applications, autonomous agents, and multimodal experiences. Teams who want to avoid vendor lock-in by maintaining portability across model providers, and developers using React, Next.js, Vue, Svelte, Angular, SolidJS, Node.js, or Expo.
Key Features
Unified Text Generation API
Generate text with `generateText` for synchronous automation tasks or `streamText` for real-time interactive experiences. Both support structured output via schema-validated objects and arrays, enabling typed data extraction, classification, and synthetic data generation without manual parsing.
Multi-Provider Model Support
Access over 100 models from 25+ official providers including OpenAI, Anthropic, Google, Mistral, xAI, Azure, Amazon Bedrock, DeepSeek, Groq, and Perplexity. Plus 30+ community providers for Ollama, OpenRouter, Cloudflare, and self-hosted models. Switch providers by changing a single model string while keeping the same API.
Streaming UI Hooks
Build real-time chat and completion interfaces with framework-agnostic hooks. `useChat` manages streaming messages, input state, loading, and errors. `useCompletion` handles text completion streaming. `useObject` consumes streamed JSON objects for structured data displays. Supports React, Vue, Svelte, Angular, and SolidJS.
Tool Calling & MCP Integration
Define custom tools with Zod schemas that models can invoke automatically. Support three tool types: custom tools you fully control, provider-defined tools optimized for specific models, and provider-executed tools that run on vendor infrastructure. Integrate with MCP (Model Context Protocol) servers for standardized tool interoperability.
Use Cases
Building AI chatbots and conversational interfaces
Developers use `useChat` and `streamText` to create responsive chatbots with real-time message streaming, tool usage, and multi-modal content support across React, Vue, and Svelte applications.
Developing generative UI components
Frontend teams build interactive AI-powered interfaces where language models generate and stream React components, forms, and dashboards directly into the UI using structured output and generative UI patterns.
Building AI agents with tool use
Engineers create autonomous agents that can search the web, query databases, call APIs, and perform calculations through custom tools and MCP integrations, orchestrating multi-step workflows with `ToolLoopAgent`.
Prototyping across multiple LLM providers
Teams evaluate and switch between OpenAI, Anthropic, Google, and open-source models without rewriting application code, using the unified provider architecture to A/B test models for cost, latency, and quality.
Pricing plans
Free to use
This tool is listed as free. There is no paid pricing page to show here—visit the official site for any usage limits, quotas, or terms of service.
Frequently Asked Questions
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