Pydantic AI v2.48.0 (2026-09-22)
Pydantic AI v2.48.0 adds support for new OpenAI models (gpt-6-sol, gpt-6-luna, audio models) and Claude Opus 5.5, along with message ID preservation fixes for Vercel AI and AG-UI.
Why this signal matters
Pydantic AI v2.48.0 includes model ecosystem updates and serialization bug fixes. Key additions feature support for OpenAI's gpt-6-sol, gpt-6-luna, and new audio models, as well as Claude Opus 5.5 ( claude-opus-5-5 ). Dependency updates bump genai-prices to 0.1.7 and subsequently 0.1.8. Bug fixes ensure UIMessage.id and AG-UI Message.id are preserved during load and dump message cycles for Vercel AI and AGUIAdapter.
Actionable summary
Pydantic AI v2.48.0 introduces support for OpenAI gpt-6-sol, gpt-6-luna, audio models, and Anthropic Claude Opus 5.5 (claude-opus-5-5). It also updates genai-prices to 0.1.8 and fixes message ID preservation in Vercel AI and AGUIAdapter load/dump operations.
- Agent usefulness
- 82/100
- Confidence
- 96%
- Canonical data
- JSON + Markdown
What builders should check
- Upgrade pydantic-ai to v2.48.0.
- Verify compatibility if utilizing OpenAI gpt-6-sol, gpt-6-luna, audio models, or Claude Opus 5.5.
- Ensure UI integrations relying on Vercel AI or AG-UI message serialization accommodate the preserved message IDs.