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Pydantic AI comparisons

These pages put Pydantic AI side by side with the frameworks people ask us about most, one page each. Our column covers the whole stack: the Pydantic AI library, the Harness SDK of ready-made capabilities and complete agents, Pydantic Evals for evaluation, Pydantic Graph for graph-based workflows, Pydantic Logfire for observability, and Pydantic itself for validation. Each capability in our column links to its docs.

Coming from one of these? Migrate to Pydantic AI covers the migration skills your coding agent can use to port an existing application, and Built with Pydantic AI lists projects and organizations running on Pydantic AI, several of which moved from LangChain.