After three years and 200K stars, LangChain commits to a frozen API surface and long-term support.
LangChain has tagged 1.0.0, marking the end of breaking changes for its core abstractions. The release standardizes the agent runtime around LangGraph, deprecates legacy chains, and ships first-class typing for tools and structured outputs. The team has committed to 18 months of LTS for the v1 line.