LangChain vs LlamaIndex: Best LLM Application Framework?

Verdict LangChain's broader ecosystem of integrations and abstractions for building multi-step agent workflows makes it the more versatile framework for complex, production-grade LLM applications. LlamaIndex excels specifically at data ingestion, indexing, and retrieval-augmented generation over structured and unstructured documents, making it the go-to for RAG-heavy applications where deep query engine capabilities matter most.