pydantic-ai 1.99.0 released

pydantic-ai 1.99.0 is available. Release notes →

Pydantic AI 1.99.0 adds support for the gemini-3.5-flash model, giving agent builders another model option to use in production workflows. It also fixes an OpenAI strict-schema bug involving regex lookarounds, which should improve reliability when validating or generating structured outputs.

What changed. 1.99.0 is the latest release.

Why it matters. Review the release notes for breaking changes before upgrading.

Builder takeaway. Pin your version or upgrade in a branch and run your eval suite before deploying.