LlamaIndex

LlamaIndex (formerly GPT Index) is a framework for building LLM-powered apps, focusing on data ingestion, indexing, and retrieval for RAG (Retrieval-Augmented Generation).

It connects LLMs to custom data sources like PDFs or databases.

Use LlamaIndex when:

• Creating chatbots or search over private documents.
• Implementing RAG for accurate, grounded responses.
• Indexing structured/unstructured data for LLMs.
• Prototyping knowledge bases quickly.

Note: Use VectorStoreIndex for simple setups.

Optimize chunk sizes for relevance.

Evaluate with faithfulness metrics.