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AI2026-05-17

GraphRAG

Also known as: GraphRAG / Graph Retrieval-Augmented Generation / グラフRAG

An extension of RAG that combines knowledge graphs with vector search to capture entity relationships, enabling more contextually rich answers than pure vector similarity can provide.


Overview

GraphRAG, introduced by Microsoft in 2024, extracts entities and relationships from documents to build a knowledge graph, which is then queried alongside vector search. Where standard RAG is limited to local similarity retrieval, GraphRAG enables global summaries and cross-document reasoning through graph traversal.

Difference from standard RAG

GraphRAG excels when cross-document relationships matter — legal documents, medical literature, and corporate policy libraries. Implementation cost is higher than standard RAG, but answer quality on complex multi-hop questions improves substantially.

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