Vercel AI SDK
Provider-agnostic TypeScript SDK for AI apps and agents
Overview
The AI SDK is Vercel's free, Apache-2.0 TypeScript library for building AI features and agents: one API across dozens of model providers, streaming UI hooks for React, Next.js, Vue, Svelte and Angular, and agent classes for multi-step tool use. Version 7 shipped in June 2026.
Pricing
Pricing shown for reference only. These figures reflect RECATOOLS research as of 12 Oct 2026 and may be out of date or incomplete. This is not financial or purchasing advice — always confirm the current price on the provider’s official website before making any decision.
Use cases
What you can produce with Vercel AI SDK
- One API across dozens of model providers and 100+ models
- Streaming UI hooks for React, Next.js, Vue, Svelte and Angular
- Typed tool calling and structured output
- ToolLoopAgent and the durable WorkflowAgent for agents
- Apache-2.0 licensed, free and open source
- Codemods for each major-version migration
The AI SDK is the default way TypeScript developers wire a model into an app: one interface over OpenAI, Anthropic, Google and dozens of other providers, with streaming, structured output and tool calling built in, and npm downloads around ten times LangChain's.
The price is churn: versions 5, 6 and 7 all shipped breaking changes within a year, and v7 requires Node.js 22 and ESM-only imports, though codemods help. G2 reviewers repeatedly say the docs thin out past simple chat. For JavaScript teams building agents or chat UIs, it is still the first thing to reach for.
What we found
Adoption is the AI SDK's strongest evidence, and it can be read straight from npm: the ai package logged 30.8 million downloads in the week to 10 October 2026, against 3.07 million for langchain and 6.35 million for @langchain/core. Vercel's site cites the same 30.8 million and more than 730 contributors. Downloads count installs, including CI runs and dependencies, not distinct teams, but the gap is wide enough to call it the default choice in TypeScript.
The cost of that position is churn. Version 5, in July 2025, split UI messages from model messages and moved streaming to server-sent events. Version 6, in December 2025, replaced the experimental Agent with ToolLoopAgent and deprecated generateObject in favour of an output option. Version 7, on 25 June 2026, requires Node.js 22 and ESM-only imports, and adds reasoning controls, typed tool context, tool approvals, a durable WorkflowAgent and provider-agnostic real-time voice. Each major ships codemods, and npm shows v5 and v6 still receiving patches in October 2026, so older lines are not abandoned, but three breaking majors in under a year is a real maintenance load.
G2 lists the SDK at 4.4 out of 5 from 103 reviews. Of the ten most recent, six raise documentation in their complaints, usually that the docs handle simple chat well and thin out for structured output, tool calling and provider-specific configuration; two mention debugging or error handling. Several carry G2's incentivised label.
The boundaries are clear. It is TypeScript and JavaScript only, and it is a library rather than a hosted platform, so model bills, observability and infrastructure stay with you. Vercel's AI Gateway is the optional commercial layer: it passes through provider list prices with no markup and gives free-tier teams $5 of credit a month. The licence is Apache 2.0, not MIT as earlier versions of this page said.
Compiled by RECATOOLS from public sources: vendor documentation and pricing, code repositories and published reporting.
About this listing
This entry was compiled from publicly available data including Vercel AI SDK's official website, press releases, documentation, and reputable third-party publications. RECATOOLS is not affiliated with Vercel AI SDK unless explicitly stated.
Third-party AI tools update their pricing, features, availability, and policies frequently. Information here may be outdated by the time you read this — we make reasonable efforts to keep listings current, but cannot guarantee absolute accuracy.
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