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LangChain

by LangChain Inc

Build context-aware reasoning applications

LangChain is the original framework for developing applications powered by language models. It provides modular components for building chains, agents, and RAG applications with extensive integrations across the LLM ecosystem.

Docs

Ease of Use

8/10

Community

10/10

Performance

7/10

Documentation

9/10

🎯 Key Features

LCEL (LangChain Expression Language)

Extensive model integrations

Pre-built agent types

Memory management

Tool/function calling

Retrieval augmented generation

Prompt templates

Output parsers

Strengths

Largest ecosystem and community

Most comprehensive integrations

Mature and battle-tested

Excellent documentation

Strong enterprise support

LCEL for composability

Limitations

Can be overwhelming for beginners

Abstraction overhead

Breaking changes in early versions

Performance overhead vs raw API calls

Best For

RAG applications
Teams needing broad integrations
Enterprise applications
Prototyping and experimentation
Standard agent patterns

Not Recommended For

Simple single-LLM calls
Performance-critical applications
Teams wanting minimal dependencies
Very custom agent architectures