LangChain
by LangChain Inc
Framework for building context-aware LLM applications
Overview
LangChain is a comprehensive framework for developing applications powered by large language models. It simplifies every stage of the LLM application lifecycle through development, productionization, and deployment.
Key Statistics
Overall Rating
4.6/5
GitHub Stars
117,000
Last Updated
2025-10
Version
0.3.13
Features
Sequential workflows
Sequential workflows capabilities
Component chaining
Component chaining capabilities
RAG pipelines
RAG pipelines capabilities
Getting Started
Installation
pip install langchain
Quick Start
Install LangChain and set API keys to start building
Code Example
from langchain_openai import ChatOpenAI
Pros & Cons
Advantages
Largest ecosystem of integrations (700+) in LLM space
Well-established with strong community support (2000+ contributors)
Excellent documentation and learning resources
MIT license allows commercial use
Strong backing and funding from Sequoia and Benchmark
Production-ready with LangSmith observability
Easy to get started with high-level API
Model agnostic - swap providers easily
Limitations
Linear chain-based architecture may be limiting for complex workflows
Can be overkill for simple applications
Learning curve for understanding the full ecosystem
Some features require understanding of LangGraph for advanced use
Abstractions may add overhead
Rapid evolution means documentation can lag behind releases
Technical Details
Primary Language
Python
Supported Languages
License
MIT
Enterprise Ready
Yes
Community Size
Very Large
Pricing
Open Source
Free open source under MIT. Commercial: LangSmith (observability) and LangGraph Platform
Performance Metrics
easeOfUse
4/5
scalability
5/5
documentation
5/5
community
5/5
performance
4/5
Common Use Cases
Chatbots and conversational AI
Question-answering systems over documents
Retrieval-Augmented Generation (RAG) applications
Document analysis and summarization
Code generation and analysis
Internal knowledge bases and support bots
Content generation workflows
API integration and data augmentation