Vercel AI SDK

The Vercel AI SDK is the open-source TypeScript toolkit: a unified API for building AI-powered applications with LLMs from providers like OpenAI, Anthropic, and Google.

This is the definitive TypeScript toolkit for building fast, reliable AI applications. The SDK provides a unified API, abstracting away provider-specific boilerplate so you can swap models—like OpenAI's GPT-4o or Anthropic's Claude 3.5 Sonnet—with a single line change. It features real-time response streaming, type-safe structured object generation via `generateObject`, and ready-to-use hooks such as `useChat` for popular frameworks: React, Next.js, and Svelte. Focus on agent logic and user experience; the SDK handles the complex, multi-provider integrations.

https://ai-sdk.dev