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v2.27.0

pydantic/pydantic-aiv2.27.0Aug 8, 2026by dsfaccini

AI Summary

Adds new provider support and settings, along with fixes for compaction handling and payload size limits.

Key Highlights

  • Add `xai_agent_count` to `XaiModelSettings`
  • Add `SnowflakeModel` and `SnowflakeProvider` for Snowflake Cortex
  • Round-trip `CompactionPart` through adapters
  • Fix payload size limit errors by pointing at the cause

New Features

  • Add `xai_agent_count` to `XaiModelSettings`
  • Add `SnowflakeModel` and `SnowflakeProvider`
  • Round-trip `CompactionPart` through the Vercel AI and AG-UI adapters

Full Release Notes

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

## What's Changed
### 🚀 Features
* Add `xai_agent_count` to `XaiModelSettings` by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/7155
* Round-trip `CompactionPart` through the Vercel AI and AG-UI adapters by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7287
* Add `SnowflakeModel` and `SnowflakeProvider` for Snowflake Cortex by @ayirpown in https://github.com/pydantic/pydantic-ai/pull/6150
### 🐛 Bug Fixes
* Honor `include_binary_content=False` in every OTel serialization sink by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/7131
* Keep `ToolReturn.tools` in the redacted OTel shape by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7273
* Fix `SpanQuery` `has_attributes` matching for JSON-serialized dict and list values by @pydanty[bot] in https://github.com/pydantic/pydantic-ai/pull/5905
* Skip re-sending the standing prompt where the OpenAI Responses compaction item retains it by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7264
* Round-trip Anthropic compaction `encrypted_content` verbatim by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7286
* Strip the compaction provenance stamp in `sanitize_messages` by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7285
* Point at the cause when a tool return or model response exceeds Temporal's payload size limit by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/7157

## New Contributors
* @ayirpown made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6150

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v2.26.0...v2.27.0