Vercel AI SDK

The Vercel AI SDK is the TypeScript toolkit for building AI-powered applications and agents — a unified library from the creators of Next.js that works with the model provider of your choice.

Overview

The AI SDK is an open-source project on GitHub with around 27,000 stars and daily development in 2026. It standardises how TypeScript applications talk to large language models: one API for generating text and structured objects, calling tools, building agents, and streaming rich, interactive UI. Providers include OpenAI, Anthropic, Google Gemini, and many more, and they can be swapped with a line of code. Framework support covers React and Next.js, Vue, Svelte, Angular, and plain Node.js, with dedicated UI hooks for chat, completion, and generative interfaces.

Key Features

• Unified API across OpenAI, Anthropic, Google, and dozens of providers
• Streaming text and UI with first-class React, Next.js, Vue, and Svelte support
• Structured object generation with schema validation
• Tool calling and multi-step agent loops built in
• Generative UI — stream interactive components from model responses
• Provider-agnostic middleware, telemetry, and testing utilities

Beyond generation, the SDK covers embeddings, reranking, and image models through the same provider abstraction, and its middleware layer supports cross-cutting concerns such as logging, caching, and guardrails. It underpins a large ecosystem of templates and production chat products, and its documentation site (ai-sdk.dev) includes cookbooks for patterns like multi-step agents, computer use, and retrieval-augmented generation.

💳 Pricing

The AI SDK is free and open source. You only pay your chosen model provider for API usage; Vercel’s hosting is optional — the SDK runs anywhere TypeScript runs.

Who Is It For

Web developers building chatbots, copilots, and agent features into production apps, who want one well-maintained library instead of hand-rolling streaming, tool calls, and provider integrations for every project.