The data framework for connecting models to your own sources.
Where LangChain is broad, LlamaIndex is focused on the retrieval half of the problem: loading data from a few hundred connectors, indexing it in several structures beyond flat vector search, and querying it with routers and rerankers. If a RAG system is returning nearly-right chunks, this is the library with the most levers for fixing it.
The framework most LLM applications are still assembled from.
Turn any set of documents into a private chat workspace.
Ask questions of your own documents with nothing leaving the machine.
Composable, typed pipelines for search and RAG systems.
Visual builder for agents and RAG flows, deployable as an API.
Fair-code workflow automation with AI steps built in.
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