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v1.35.0

pydantic/pydantic-aiv1.35.0Dec 17, 2025by DouweM

AI Summary

Introduces a `FileSearchTool` and support for new AI models including Alibaba Cloud DashScope and Gemini 3 Flash. It also adds AG-UI multi-modal message support and OpenAI reasoning options.

Key Highlights

  • Add `FileSearchTool` with support for OpenAI and Google
  • Add support for `ImageGenerationTool.size` to Gemini
  • Add Alibaba Cloud `DashScopeProvider` and Qwen Omni audio input
  • Support OpenAI reasoning summary option 'auto'

New Features

  • FileSearchTool
  • Image generation size support
  • DashScope/Qwen provider support
  • OpenAI reasoning 'auto' option
  • AG-UI multi-modal messages

Full Release Notes

## What's Changed
* Add `FileSearchTool` with support for OpenAI and Google by @gorkachea in https://github.com/pydantic/pydantic-ai/pull/3396
* Add support for `ImageGenerationTool.size` to Gemini image models by @h0rv in https://github.com/pydantic/pydantic-ai/pull/3720
* Adding Gemini 3 flash by @jhammarstedt in https://github.com/pydantic/pydantic-ai/pull/3755
* Add Alibaba Cloud `DashScopeProvider` and support audio input for Qwen Omni by @Pavanmanikanta98 in https://github.com/pydantic/pydantic-ai/pull/3596
* Added support for AG-UI Multi-modal Messages by @bojan2501 in https://github.com/pydantic/pydantic-ai/pull/3715
* Set timestamps on AG-UI events by @thejens in https://github.com/pydantic/pydantic-ai/pull/3742
* Support OpenAI reasoning summary option 'auto' by @DouweM in https://github.com/pydantic/pydantic-ai/pull/3753
* Operate on a deepcopy of `$defs` in `JsonSchemaTransformer` instead of the original schema by @thomasst in https://github.com/pydantic/pydantic-ai/pull/3758
* Fix typing issue when using `UIAdapter.dispatch_request` with agent with `output_type` by @DouweM in https://github.com/pydantic/pydantic-ai/pull/3749

## New Contributors
* @h0rv made their first contribution in https://github.com/pydantic/pydantic-ai/pull/3720
* @thejens made their first contribution in https://github.com/pydantic/pydantic-ai/pull/3742
* @gorkachea made their first contribution in https://github.com/pydantic/pydantic-ai/pull/3396
* @bojan2501 made their first contribution in https://github.com/pydantic/pydantic-ai/pull/3715
* @thomasst made their first contribution in https://github.com/pydantic/pydantic-ai/pull/3758

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.34.0...v1.35.0