LangChain

LangChain is a framework for developing applications powered by large language models (LLMs).

LangChain simplifies every stage of the LLM application lifecycle:

• Development: Build your applications using LangChain’s open-source building blocks and components. Hit the ground running using third-party integrations and Templates.-
• Productionization: Use LangSmith to inspect, monitor and evaluate your chains, so that you can continuously optimize and deploy with confidence.
• Deployment: Turn any chain into an API with LangServe.

Concretely, the framework consists of the following open-source libraries:

• langchain-core: Base abstractions and LangChain Expression Language.
• langchain-community: Third party integrations.
  • Partner packages (e.g. langchain-openai, langchain-anthropic, etc.): Some integrations have been further split into their own lightweight packages that only depend on langchain-core.
• langchain: Chains, agents, and retrieval strategies that make up an application’s cognitive architecture.
• langgraph: Build robust and stateful multi-actor applications with LLMs by modeling steps as edges and nodes in a graph.
• langserve: Deploy LangChain chains as REST APIs.