Home / Framework / LangChain Framework LangChain — A framework for building applications powered by large language models (LLMs). Official links www.langchain.com langchain-ai/langchain LangChain is written in Python Language Python is a programming language that is simple, versatile, and widely used. LangChain features A AI Trait Artificial Intelligence A API Trait Application Programming Interface LangChain has a pricing O Open Source Pricing Community built. Open access. Multiple licenses.