LlamaIndex Framework is a comprehensive data framework designed for integrating custom data sources with large language models (LLMs). It offers a production-ready platform with state-of-the-art RAG algorithms and robust integrations for data loading, indexing, and retrieval. The framework provides flexibility and customization for AI engineers at all levels, enabling the use of numerous integrations or the creation of custom logic. LlamaIndex supports advanced RAG techniques to enhance LLM context and reduce hallucination, and it allows the construction of complex agents capable of executing multifaceted tasks and API calls. Additionally, LlamaIndex facilitates the development of LLM applications through its extensive resources, including documentation, webinars, guides, tutorials, and a diverse set of tools and data sources available in LlamaHub.