Data framework and agent SDK for building RAG and knowledge agents over private data.
LlamaIndex is a framework for connecting LLMs to private and enterprise data, providing ingestion, indexing, retrieval, and query engines for RAG. It has evolved into a full agent SDK with workflows, tool use, and multi-agent orchestration. LlamaCloud offers hosted parsing (LlamaParse), indexing, and retrieval as a managed service.
Open-source framework is free (MIT). LlamaCloud/LlamaParse offers a free tier with usage-based paid plans.