pydantic-ai

What's Changed

🚀 Features

• Add native Z.AI (Zhipu AI) provider with thinking support by @eliasaronson in https://github.com/pydantic/pydantic-ai/pull/4273

🐛 Bug Fixes

• fix(test): set provider_name on TestModel non-streaming responses by @syf2211 in https://github.com/pydantic/pydantic-ai/pull/6066
• Keep Bedrock tool results non-empty for empty lists by @Whning0513 in https://github.com/pydantic/pydantic-ai/pull/6155
• fix(huggingface): don't silently drop file content in tool returns by @HaozheZhang6 in https://github.com/pydantic/pydantic-ai/pull/5881
• fix: skip OpenAI thinking-only chat history messages by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/6182
• Don't send defer_loading without tool_search on models without native tool search by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/6144
• Route remaining instrumentation serialization through safe_to_json by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/6073
• fix: reconstruct multimodal ToolReturnPart.content via a ToolReturnContent discriminator by @DouweM in https://github.com/pydantic/pydantic-ai/pull/6191
• Fix AGUIAdapter.dump_messages reordering ToolReturnPart after UserPromptPart by @amarjaleelbanbhan in https://github.com/pydantic/pydantic-ai/pull/5969
• fix: track new_messages() boundary by position so a rebuilt resumed request isn't leaked by @klplentific in https://github.com/pydantic/pydantic-ai/pull/6034
• Preserve tool_kind in Vercel AI and AG-UI message round-trips by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/5873
• Make durable-exec MCP get_tools caching replay-deterministic by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/5883
• Preserve FilePart.content.vendor_metadata in AG-UI and Vercel AI adapter round-trips by @Navaneethp007 in https://github.com/pydantic/pydantic-ai/pull/6095
• Resolve dynamic toolset get_instructions in an activity under Temporal by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/5925

New Contributors

• @Whning0513 made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6155
• @eliasaronson made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4273
• @amarjaleelbanbhan made their first contribution in https://github.com/pydantic/pydantic-ai/pull/5969
• @klplentific made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6034
• @Navaneethp007 made their first contribution in https://github.com/pydantic/pydantic-ai/pull/6095

Full Changelog: https://github.com/pydantic/pydantic-ai/compare/v2.2.0...v2.3.0