Vercel AI SDK v5

The definitive TypeScript framework for building production-grade AI agents with agentic loop control and end-to-end type safety.

Vercel AI SDK v5 delivers a ground-up rewrite optimized for agentic workflows and full-stack type safety. It introduces a revamped v2 provider specification to handle multimodal outputs and provider-executed tools with Zod-backed precision. The redesigned useChat hook separates UIMessages from ModelMessages: this architecture simplifies state management and history persistence. Developers gain granular control over multi-step processes using new loop primitives (stopWhen and prepareStep) while benefiting from stable SSE-based streaming and native speech APIs. It is the definitive toolkit for building low-latency, production-ready AI interfaces.

https://sdk.vercel.ai/docs