Vercel AI SDK Open source
TypeScript toolkit for building AI apps with any model
What is Vercel AI SDK?
The AI SDK is an open-source TypeScript library that unifies providers behind one API and handles streaming, tool calls, structured output and React and Svelte UI hooks. It is the standard for AI features in Next.js apps.
Pros
- Provider-agnostic
- Excellent streaming and UI helpers
- Free and open source
Cons
- JavaScript only
- Tied closely to the Vercel ecosystem
Vercel AI SDK pricing
Open source. Prices change often, so confirm on the official pricing page.
Best Vercel AI SDK alternatives
All alternatives →OpenAI API Paid
GPT, reasoning, image, audio and realtime models with the Responses API
Claude API Paid
Anthropic's Claude models for coding, agents and long documents
Hugging Face Freemium
The home of open models, datasets and Spaces demos
Google AI Studio Freemium
Prototype with Gemini for free, then ship with the Gemini API
Ollama Open source
Run Llama, Gemma, DeepSeek and more locally with one command
OpenRouter Paid
One API key for hundreds of models from every provider
Compare Vercel AI SDK
Verdict
Vercel AI SDK scores 8.4/10 in our llm apis & developer platforms ranking. It is a solid choice, though the alternatives above are worth a look.