P Moth-Retrieval: Graph-Free Multi-Hop Retrieval via Query-Time Orchestration (Beating Graph-Based Systems on HotpotQA) [P]

Short summary

MOTHRAG, an open-source RAG framework, ditches knowledge graphs entirely and instead uses query-time orchestration to achieve multi-hop reasoning. On HotpotQA and 2WikiMultiHopQA, it outperforms graph-based systems like GraphRAG and HippoRAG while handling data updates as simple embed-and-append operations (~$0.03/query). It trades performance on complex reasoning tasks but gains operational simplicity and cost efficiency for frequently-changing corpora.

• •Graph-free architecture outperforms knowledge-graph systems on standard multi-hop QA benchmarks
• •Eliminates expensive offline re-indexing; updates via embed-and-append (~$0.03/query)
• •Trade-off: simpler operations and lower cost vs. performance on complex reasoning (MuSiQue)

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