Both sit in the framework layer with similar commercial terms, so the practical split is language: DSPy targets Python and Vercel AI SDK targets TypeScript.
Programs, not prompts — compile and optimise the prompt against a metric.
Streaming-first TypeScript SDK with a unified provider interface and UI hooks.
| DSPy | Vercel AI SDK | |
|---|---|---|
| Licence | Open source | Open source |
| Pricing | open source | open source |
| Self-hostable | Yes | Yes |
| Languages | Python | TypeScript |
| Install | pip install dspy | npm install ai |
| Keys required | None | None |
Both sit in the framework layer with similar commercial terms, so the practical split is language: DSPy targets Python and Vercel AI SDK targets TypeScript. DSPy: Programs, not prompts — compile and optimise the prompt against a metric. Vercel AI SDK: Streaming-first TypeScript SDK with a unified provider interface and UI hooks.
DSPy can run on your own infrastructure. Vercel AI SDK can run on your own infrastructure.
DSPy is open source (open source). Vercel AI SDK is open source (open source).
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/compare/dspy-vs-vercel-ai-sdk