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v2.20.0

EvoMap/evolverv2.20.0Jul 29, 2026by dsfaccini

AI Summary

A feature release adding support for Claude Opus 5 and OpenAI Responses API reasoning context, along with various bug fixes for usage tracking and error handling.

Key Highlights

  • Added support for Claude Opus 5 model.
  • Added OpenAI Responses API reasoning.context support.
  • Preserve arbitrary RequestUsage fields across serialization.
  • Fixed ALLOW_MODEL_REQUESTS guards for embeddings.
  • Replay tool-search history across provider boundaries.

New Features

  • Claude Opus 5 support.
  • OpenAI Responses API reasoning.context support.

Full Release Notes

<!-- Release notes generated using configuration in .github/release.yml at main -->

## What's Changed
### 🚀 Features
* Add Claude Opus 5 (`claude-opus-5`) support by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/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 https://github.com/pydantic/pydantic-ai/pull/6673
### 🐛 Bug Fixes
* Preserve arbitrary `RequestUsage` fields across serialization by @alexmojaki in https://github.com/pydantic/pydantic-ai/pull/6685
* Capture Anthropic thinking tokens in usage details by @jakub-orsula-parrot in https://github.com/pydantic/pydantic-ai/pull/6753
* Fix `ALLOW_MODEL_REQUESTS` guards for embeddings by @zcxGGmu in https://github.com/pydantic/pydantic-ai/pull/6774
* Skip `include_server_side_tool_invocations` for Vertex on Gemini 3+ by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/6773
* Fix `_openrouter_settings_to_openai_settings` mutating caller's settings dict by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/6743
* Replay tool-search history across provider boundaries instead of dropping it by @DouweM in https://github.com/pydantic/pydantic-ai/pull/6780
* Preserve zero-valued OpenTelemetry usage details by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6796
* Expose OpenAI Responses phase on the streamed `PartStartEvent` by @Jonas1312 in https://github.com/pydantic/pydantic-ai/pull/6785
* Make a bare `McpError` from an MCP server recoverable instead of fatal by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6787

## New Contributors
* @jakub-orsula-parrot made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6753
* @Jonas1312 made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6785
* @dexhunter made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6485

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v2.19.0...v2.20.0