LlamaIndex
by LlamaIndex
LlamaIndex (formerly known as GPT Index) is an open-source data framework designed to facilitate the integration and querying of custom data sources with large language models (LLMs). It provides tools for ingesting, structuring, and accessing private or domain-specific data, enabling developers to build LLM-powered applications such as chatbots, document Q&A systems, and knowledge agents. LlamaIndex supports a variety of data connectors, indexing methods, and query interfaces to optimize performance and relevance in LLM applications. It is widely used for retrieval-augmented generation (RAG) workflows.
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Weighted across four pillars · updated January 25, 2026
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