Agents & frameworks · A-tier

Vercel AI SDK

TypeScript toolkit for streaming chat, tools, and agents in Next.js and other JS apps.

Open Vercel AI SDK Best AI agent frameworks

Best for

TypeScript apps that need streaming chat or a small tool-calling agent.

What it is

The Vercel AI SDK is a TypeScript toolkit for streaming model output, tool calls, and agent loops. It is the shortest path when the app is already Next.js or another JavaScript server. The SDK is open source and free.

typescriptopen-sourcestreamingAgents & frameworks

Score breakdown

Capability 40%86
Ease 25%88
Value 20%96
Momentum 15%86

Pricing

Free

Starting price: $0

The SDK is open source and free. You pay the model provider, and Vercel hosting if you deploy there.

Dates

Released 2023 (year precision).

Added to StackPick 14 Oct 2026.

Alternatives

A-tier · 84

Mastra

TypeScript teams who want agents, workflows, and evals in one library.

A-tier · 83

LangChain

Application code that needs tools, retrieval, and a large example ecosystem.

A-tier · 81

Pydantic AI

Python services that want typed tool-calling agents.

Questions

What is Vercel AI SDK best for?

TypeScript apps that need streaming chat or a small tool-calling agent.

How much does Vercel AI SDK cost?

Free. Starting price: $0. The SDK is open source and free. You pay the model provider, and Vercel hosting if you deploy there.

What are alternatives to Vercel AI SDK?

Mastra, LangChain, Pydantic AI are the alternatives we file next to it. Open a comparison when one exists.