Vercel AI SDK

The Vercel AI SDK is an open-source TypeScript toolkit that provides a universal abstraction layer for building AI-powered applications and agents across multiple language model providers. Developed and maintained by Vercel with over 16 million weekly npm downloads, 25,100 GitHub stars, and contributions from 661-plus developers, the SDK has become the de facto standard for integrating large language models into JavaScript and TypeScript applications. The architecture separates concerns into three layers: AI SDK Core provides primitive functions for text generation, object generation, streaming responses, and embeddings with built-in fallback handling and automatic retries; AI SDK UI delivers framework-agnostic React hooks and components for chat interfaces, generative interfaces, and streaming rendering; and AI SDK RSC enables React Server Components integration for server-side AI generation. The SDK supports over 100 model providers including OpenAI, Anthropic, Google, Mistral, Cohere, Amazon Bedrock, and local models via Ollama, with a unified interface that allows switching providers by changing a single configuration line. Supported frontend frameworks include React, Next.js, Vue, Svelte, Solid, Angular, and Nuxt. Advanced capabilities include tool calling and function execution for agentic workflows, multi-step reasoning with automatic tool selection, structured output with Zod schema validation, streaming with backpressure handling, and Vercel AI Gateway for unified billing across providers with zero markup. The ecosystem extends to AI Sandbox for secure agent code execution, Workflows for long-running agents with suspend and resume, AI Elements component library, and a Tools Registry for sharing agent capabilities across projects.