pydantic-ai 1.98.0

v1.98.0 (2026-05-18)

on Python PyPI

What's Changed

🚀 Features

• Add OpenAI Responses input token counting (OpenAIResponsesModel.count_tokens) by @colesmcintosh in #3951
• Replace Agent tool_retries=/output_retries= with retries: int | AgentRetries by @Kludex in #5500

🐛 Bug Fixes

• fix(mcp): Don't require fastmcp.server at runtime by @Kymi808 in #5514

🆕 V2 Preparation

• Deprecate pydantic_ai.ext.aci (tool_from_aci and ACIToolset) by @dsfaccini in #5510

New Contributors

• @Kymi808 made their first contribution in #5514

Full Changelog: v1.97.0...v1.98.0