L
LangChain
4.3
Freemium — from $39/mo The most popular framework for building LLM-powered applications with chains, agents, and retrieval-augmented generation. Includes LangSmith for debugging and LangServe for deployment.
Key Features
- LLM application framework
- RAG pipeline building
- Agent and tool integration
- LangSmith debugging platform
- LangServe deployment
Pros
- + Most popular LLM framework
- + Extensive integration library
- + Active development community
Cons
- − Can be over-engineered for simple tasks
- − Rapid API changes
framework LLM apps RAG agents open-source