Vercel AI SDK
The AI SDK is a provider-agnostic open-source TypeScript toolkit from Vercel for building AI applications and agents.
Free tierOpen sourceVerified
Our verdict
A popular TypeScript toolkit for adding LLM features to web apps: streaming UI, tool calls and a provider-agnostic API. Not a full agent framework, but often all you need.
Best for
- ✓ Chat and AI features inside Next.js / React apps
- ✓ Switching model providers easily
Watch out for
- ! You assemble agent orchestration yourself
Pricing
Read from the official pricing page. Prices in USD; always confirm on the vendor's site.
| Plan | Price | Details |
|---|---|---|
| SDK (open source) | Free | Apache-2.0 library. Model provider usage billed separately - check site. |
Note: License verified from the official repo LICENSE file. No standalone pricing page for the SDK; model/gateway costs not recorded.
Open source (Apache-2.0). Source code
When to switch
You need full agent orchestration with handoffs and guardrails
→ Mastra. Mastra adds workflows, memory and agent structure on top of TypeScript.