LangChain
LangChain is a framework that helps developers build AI agents and LLM-powered applications that connect to models and data sources.
What it is good for
- Connecting a language model to outside data sources and tools
- Swapping between AI models without rewriting an application
- Prototyping and testing LLM-powered applications quickly
- Building production AI agents with monitoring and debugging
At a glance
- Who it is for
- Setup
- Requires programming
Level 5 of 5. You need to write code to use it.
- Cost
- Free and open source
- Type
- Framework or SDK
- Tasks
- Works with
- OpenAI, Anthropic, Gemini, LangGraph, LangSmith, LangChain.js
Momentum
- Rank this week
- Not ranked yet
- Best rank
- None yet
- GitHub stars
- 148,874
GitHub numbers as of Nov 2, 2026. Updated weekly.
Official links
Setup steps are on the official pages. We do not repeat them here, since they change.
Questions
- Is LangChain free?
- Yes. It is free and open source (MIT license).
- Do I need to know how to code to use LangChain?
- Yes. You need to write code to use it.
- What does LangChain work with?
- According to its own documentation, it works with OpenAI, Anthropic, Gemini, LangGraph, LangSmith, and LangChain.js.
- What is LangChain good for?
- Connecting a language model to outside data sources and tools, swapping between AI models without rewriting an application, prototyping and testing LLM-powered applications quickly, and building production AI agents with monitoring and debugging.
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