The Vercel AI SDK is an open-source library designed to help developers build conversational, streaming, and chat user interfaces in JavaScript and TypeScript. The SDK supports React/Next.js, Svelte/SvelteKit, with support for Nuxt/Vue coming soon. It is compatible with Vercel's Edge Network, enabling AI-powered apps that are fast and scalable. The SDK includes first-class support for LangChain, OpenAI, Anthropic, and Hugging Face, and has SWR-powered React hooks for fetching and rendering streaming text responses. It also has callbacks for saving completed streaming responses to a database in the same request.