Both sit in the framework layer with similar commercial terms, so the practical split is language: LangGraph targets Python and Pydantic AI targets Python.
Graph-shaped orchestration with checkpointing, interrupts and human-in-the-loop.
Type-safe Python agents with structured output that actually validates.
| LangGraph | Pydantic AI | |
|---|---|---|
| Licence | Open source | Open source |
| Pricing | open source | open source |
| Self-hostable | Yes | Yes |
| Languages | Python, TypeScript | Python |
| Install | pip install langgraph | pip install pydantic-ai |
| Keys required | None | None |
Both sit in the framework layer with similar commercial terms, so the practical split is language: LangGraph targets Python and Pydantic AI targets Python. LangGraph: Graph-shaped orchestration with checkpointing, interrupts and human-in-the-loop. Pydantic AI: Type-safe Python agents with structured output that actually validates.
LangGraph can run on your own infrastructure. Pydantic AI can run on your own infrastructure.
LangGraph is open source (open source). Pydantic AI 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/langgraph-vs-pydantic-ai