v1.66.0

pydantic/pydantic-aiv1.66.0Mar 5, 2026by DouweM

AI Summary

Enables native structured output for Qwen 3.5 models and adds the Nano Banana 2 model support.

Key Highlights

Enable native structured output for Qwen 3.5 models
Add Nano Banana 2 (`gemini-3.1-flash-image-preview`) model

New Features

Qwen 3.5 structured output
Nano Banana 2 model

Full Release Notes

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

## What's Changed
### 🚀 Features
* Enable native structured output for Qwen 3.5 models by @ggozad in https://github.com/pydantic/pydantic-ai/pull/4534
* Add Nano Banana 2 (`gemini-3.1-flash-image-preview`) by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/4525
### 🐛 Bug Fixes
* Fix builtin tool availability checking when using `TemporalAgent` with multiple models by @mattbrandman in https://github.com/pydantic/pydantic-ai/pull/4100
* Fix `HasMatchingSpan` YAML export/import round-trip for `SpanQuery` arguments by @debu-sinha in https://github.com/pydantic/pydantic-ai/pull/4454

## New Contributors
* @debu-sinha made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4454
* @advaitathreya made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4499

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.65.0...v1.66.0