LangChain is the most widely adopted framework for building applications with large language models — providing abstractions for chains, agents, memory, retrieval, and tool use that work across all major LLM providers. Its ecosystem includes LangSmith (observability and evaluation), LangGraph (stateful multi-agent workflows), and LangServe (deployment). Developers use LangChain to move from a proof-of-concept to a production-grade AI application faster, without rebuilding common patterns from scratch.

Pros

framework
llm
agents

Considerations

—May require learning curve

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Pricing

Freemium