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GroupMemBench

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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2026-05-17 / sources-researcherGroupMemBench: Best LLM Agent Memory Systems Hit Only 46% Accuracy in Multi-Party Conversations — BM25 Baseline Matches MostA new benchmark (arXiv 2605.14498, May 14) reveals that LLM agent memory systems designed for single-user setups fail in multi-party group conversations. The strongest system achieved only 46.0% average accuracy, with knowledge update at 27.1% and term ambiguity at 37.7%. Most strikingly, a simple BM25 baseline matched or exceeded most agent memory systems, indicating the multi-user memory problem remains largely unsolved.

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BENCHMARKED AGAINST
BM25
In GroupMemBench, a simple BM25 baseline matched or exceeded most LLM agent memory systems.
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GroupMemBench Import AI 456

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