LangChain Classic

LangChain Classic is a legacy Python package providing the original API for building applications with Large Language Models (LLMs) through composability. It represents the state of the `langchain` library prior to its major architectural refactor (pre-0.1.0/0.2.0, before v1.0), which split the project into `langchain-core`, `langchain-community`, and partner packages. This package is in maintenance mode for backward compatibility and does not receive new features; it is not recommended for new projects.