Pydantic

library 2.12.5 ·python

✓ verified Jun 9, 2026 ✓ install

serialization web-framework database

The most widely used Python data validation library. Powers OpenAI SDK, Anthropic SDK, LangChain, FastAPI, LlamaIndex, and hundreds of other libraries. V2 released June 2023 — a near-complete rewrite in Rust via pydantic-core, 4-50x faster than V1. Current version is 2.12.5 (Mar 2026). V1 security fixes ended June 2024. V3 planned roughly annually.

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Resources

docsdocs.pydantic.dev ↗

githubgithub.com/sponsors/samuelcolvin ↗

changelogdocs.pydantic.dev/latest/changelog/ ↗

packagepypi.org/project/pydantic/ ↗

API endpoints

full doc /v1/registry/pydantic

install /v1/registry/pydantic/install

compatibility /v1/registry/pydantic/compatibility