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v1.91.0

pydantic/pydantic-aiv1.91.0May 7, 2026by DouweM

AI Summary

Adds support for OpenAI gpt-image-2 options and DeepSeek v4-flash/v4-pro models, while fixing Unicode preservation in YAML datasets and MCP history replay.

Key Highlights

  • Support for DeepSeek v4 models (v4-flash and v4-pro)
  • Support for OpenAI gpt-image-2 options
  • Fix Unicode preservation in YAML datasets
  • Fix MCP history replay for empty tool arguments

New Features

  • DeepSeek v4-flash and v4-pro model support
  • OpenAI gpt-image-2 options support

Full Release Notes

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

## What's Changed
### 🚀 Features
* feat(openai): support `gpt-image-2` options by @banteg in https://github.com/pydantic/pydantic-ai/pull/5234
* feat(deepseek): add support for `deepseek-v4-flash` and`deepseek-v4-pro` by @SuperMarioYL in https://github.com/pydantic/pydantic-ai/pull/5195

### 🐛 Bug Fixes
* fix(evals): preserve Unicode in YAML datasets by @Kcstring in https://github.com/pydantic/pydantic-ai/pull/5245
* Skip empty `ModelResponse` in OpenAI Chat assistant message mapping by @DouweM in https://github.com/pydantic/pydantic-ai/pull/5300
* Fix MCP history replay for empty tool arguments by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/5314

## New Contributors
* @Kcstring made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5245
* @khaldon made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5301
* @SuperMarioYL made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5195
* @banteg made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5234

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.90.0...v1.91.0