✓ Use when
Engineers building production RAG systems, multi-step AI agents, or complex LLM pipelines.
✗ Avoid when
Simple single-API-call applications — direct API calls are simpler and faster.
What is LangChain?
LangChain is the standard framework for chaining LLM calls, building RAG pipelines, and creating AI agents. Massive ecosystem, extensive integrations, and active community. LangSmith adds observability and debugging.
Key features
✓RAG pipeline builder
✓AI agent framework
✓LangSmith observability
✓100+ LLM and vector store integrations
✓Streaming support
Integrations
OpenAIAnthropicPinecone
Third-party ratings
GitHub
4.6· 8,900 reviews
💰 Real-world pricing
What people actually pay
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User Reviews
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