🚀 Pydantic AI V2 Beta 5 is here!

For more information on Pydantic AI V2, see the release notes for v2.0.0b1 and the Upgrade Guide.

Beta 5 adds no new breaking or v2-specific changes, but pulls in these changes from v1.105.0:

What's Changed

🚀 Features

• feat: On-demand (deferred loading) capabilities, including instructions, tools, model settings, and hooks by @adtyavrdhn in #5230
• Add Grok 4.3 reasoning_effort support and current xAI model names by @adtyavrdhn in #5454

🐛 Bug Fixes

• Fix gateway/ model construction inside a Temporal workflow by passing provider SDKs through the sandbox by @adtyavrdhn in #5733
• Fix GoogleModelSettings.google_cached_content so request omits system_instruction, tools, and tool_config by @gaurav0107 in #5681

New Contributors

• @gaurav0107 made their first contribution in #5681

Full Changelog: v2.0.0b4...v2.0.0b5