pydantic-ai 2.16.0

v2.16.0 (2026-07-22)

on Python PyPI

What's Changed

🚀 Features

• Add mistral_prompt_cache_key setting and pass parallel_tool_calls to the Mistral SDK by @lionpeloux in #6654
• Add ToolFailed for model-visible failures without retries by @adtyavrdhn in #5585
• Add optional run_id= to agent runs, durable wrappers, and UI adapters by @grahamcracker1234 in #6615
• Hoist openai_moderation to OpenAIChatModelSettings and expose Chat Completions moderation results in provider_details by @dsfaccini in #6658
• feat(google): add Model Armor support for Google Cloud via GoogleModelSettings by @Alex-Resch in #5691
• Add gemini-3.6-flash and gemini-3.5-flash-lite models by @dsfaccini in #6668

🐛 Bug Fixes

• Raise a consistent ctx.enqueue() error inside durable units across Temporal, DBOS, and Prefect by @DouweM in #6666
• Preserve $ref sibling keywords when inlining $defs by @lntutor in #6592
• Guard ctx.enqueue() from an event_stream_handler inside DBOS steps / Prefect tasks by @DouweM in #6671
• Preserve failed tool outcomes across AG-UI message round trips by @dsfaccini in #6659
• Fix tool retry counts across skipped steps by @zcxGGmu in #6582

📦 Dependencies

• Bump pillow, pyasn1, and setuptools to resolve Dependabot alerts by @hramezani in #6657

New Contributors

• @AKSHITAK1040 made their first contribution in #6633
• @grahamcracker1234 made their first contribution in #6615
• @sergioperezcheco made their first contribution in #6585
• @lntutor made their first contribution in #6592
• @zcxGGmu made their first contribution in #6582

Full Changelog: v2.15.0...v2.16.0