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Pydantic AI Updates: July 29, 2026

pydantic-ai agents open-source python model-support

1. Pydantic AI v2.20.0 Adds Claude Opus 5 And New OpenAI Reasoning Support

Pydantic AI released v2.20.0, adding support for Anthropic’s Claude Opus 5 (claude-opus-5) and OpenAI Responses API reasoning.context for the gpt-5.4, gpt-5.5, and gpt-5.6 model families. The release also fixes RequestUsage serialization, corrects handling of Anthropic thinking tokens, and improves MCP server error handling. The additions let developers target the latest frontier models and preserve reasoning context through the framework’s typed agent interface. Source