pydantic-ai 2.20.0

v2.20.0 (2026-07-28)

on Python PyPI

What's Changed

🚀 Features

• Add Claude Opus 5 (claude-opus-5) support by @dsfaccini in #6723
• Add OpenAI Responses API reasoning.context support (default all_turns) for the gpt-5.4/gpt-5.5/gpt-5.6 families by @pydanty[bot] in #6673

🐛 Bug Fixes

• Preserve arbitrary RequestUsage fields across serialization by @alexmojaki in #6685
• Capture Anthropic thinking tokens in usage details by @jakub-orsula-parrot in #6753
• Fix ALLOW_MODEL_REQUESTS guards for embeddings by @zcxGGmu in #6774
• Skip include_server_side_tool_invocations for Vertex on Gemini 3+ by @pydanty[bot] in #6773
• Fix _openrouter_settings_to_openai_settings mutating caller's settings dict by @pydanty[bot] in #6743
• Replay tool-search history across provider boundaries instead of dropping it by @DouweM in #6780
• Preserve zero-valued OpenTelemetry usage details by @dsfaccini in #6796
• Expose OpenAI Responses phase on the streamed PartStartEvent by @Jonas1312 in #6785
• Make a bare McpError from an MCP server recoverable instead of fatal by @dsfaccini in #6787

New Contributors

• @jakub-orsula-parrot made their first contribution in #6753
• @Jonas1312 made their first contribution in #6785
• @dexhunter made their first contribution in #6485

Full Changelog: v2.19.0...v2.20.0