LangChain APIs now allow using Pydantic v2 models for BaseTool and StructuredTool. This can enhance type safety, improve code readability, and simplify the integration of tools and chat models.

A number of chat models also support accepting Pydantic v2 models in bind_tools and with_structured_output (including Anthropic, OpenAI, Fireworks, and Mistral).

These updates require langchain-core>=0.2.23

For more details, read our docs here.