Ask HN: RAG, GraphRAG or something else for an AI in a group chat?

Hi HN, I’m building a chat app where users can create group chats that include an AI. The idea is that group members can ask questions or share information with the AI, and the AI should be able to remember who said what, for better context and retrieval later on.

I’m exploring RAG-based approaches and looking into GraphRAG (like CircleMind or Neo4j-based solutions), but these seem complex and potentially expensive to scale.

Do you think GraphRAG is the right fit for this kind of group-context memory? Or would a simpler architecture be more appropriate? Any advice or alternatives would be much appreciated!

Thanks a lot!