mlsanityData to 14 Oct 2026

HyperMem: Hypergraph Memory for Long-Term Conversations

arXiv 2604.08256 ↗First posted 9 Apr 2026cs.CL cs.AIcited by 14

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Abstract (arXiv)

Long-term memory is essential for conversational agents to maintain coherence, track persistent tasks, and provide personalized interactions across extended dialogues. However, existing approaches as Retrieval-Augmented Generation (RAG) and graph-based memory mostly rely on pairwise relations, which can hardly capture high-order associations, i.e., joint dependencies among multiple elements, causing fragmented retrieval. To this end, we propose HyperMem, a hypergraph-based hierarchical memory architecture that explicitly models such associations using hyperedges. Particularly, HyperMem structures memory into three levels: topics, episodes, and facts, and groups related episodes and their facts via hyperedges, unifying scattered content into coherent units. Leveraging this structure, we design a hybrid lexical-semantic index and a coarse-to-fine retrieval strategy, supporting accurate and efficient retrieval of high-order associations. Experiments on the LoCoMo benchmark show that HyperMem achieves state-of-the-art performance with 92.73% LLM-as-a-judge accuracy, demonstrating the effectiveness of HyperMem for long-term conversations.

Key facts. Cited by 14 papers in the map (data through 14 Oct 2026). Builds on 30 of its 54 references that are in the map. First posted on arXiv 9 Apr 2026.

Builds on

30 of 54 references.

References · 30

  1. 2020Retrieval-Augmented Generation for Knowledge-Intensive NLP Taskscited by 9,297
  2. 2023Self-RAG: Learning to Retrieve, Generate, and Critique through Self-Reflectioncited by 1,839
  3. 2024From Local to Global: A Graph RAG Approach to Query-Focused Summarizationcited by 1,453
  4. 2023MemGPT: Towards LLMs as Operating Systemscited by 1,389
  5. 2025Qwen3 Embedding: Advancing Text Embedding and Reranking Through Foundation Modelscited by 1,261
  6. 2025A-MEM: Agentic Memory for LLM Agentscited by 1,063
  7. 2024Evaluating Very Long-Term Conversational Memory of LLM Agentscited by 830
  8. 2024A Survey on the Memory Mechanism of Large Language Model based Agentscited by 634
  9. 2024RAPTOR: Recursive Abstractive Processing for Tree-Organized Retrievalcited by 532
  10. 2018Hypergraph Neural Networkscited by 488
  11. 2025Zep: A Temporal Knowledge Graph Architecture for Agent Memorycited by 400
  12. 2023Reasoning on Graphs: Faithful and Interpretable Large Language Model Reasoningcited by 328
18 more
  1. 2024LightRAG: Simple and Fast Retrieval-Augmented Generationcited by 315
  2. 2025MEM1: Learning to Synergize Memory and Reasoning for Efficient Long-Horizon Agentscited by 238
  3. 2025From RAG to Memory: Non-Parametric Continual Learning for Large Language Modelscited by 231
  4. 2025LightMem: Lightweight and Efficient Memory-Augmented Generationcited by 180
  5. 2025Know Me, Respond to Me: Benchmarking LLMs for Dynamic User Profiling and Personalized Responses at Scalecited by 178
  6. 2025MIRIX: Multi-Agent Memory System for LLM-Based Agentscited by 173
  7. 2025MemGen: Weaving Generative Latent Memory for Self-Evolving Agentscited by 109
  8. 2024Reducing hallucination in structured outputs via Retrieval-Augmented Generationcited by 93
  9. 2025MemInsight: Autonomous Memory Augmentation for LLM Agentscited by 85
  10. 2025PathRAG: Pruning Graph-based Retrieval Augmented Generation with Relational Pathscited by 61
  11. 2026EverMemOS: A Self-Organizing Memory Operating System for Structured Long-Horizon Reasoningcited by 54
  12. 2024Don't Forget to Connect! Improving RAG with Graph-based Rerankingcited by 49
  13. 2025What Deserves Memory: Adaptive Memory Distillation for LLM Agentscited by 48
  14. 2025Retrieval-Augmented Generation with Hierarchical Knowledgecited by 47
  15. 2024Improving Retrieval Augmented Language Model with Self-Reasoningcited by 28
  16. 2024Reinforcement Learning for Optimizing RAG for Domain Chatbotscited by 26
  17. 2024SiReRAG: Indexing Similar and Related Information for Multihop Reasoningcited by 23
  18. 2025Hyper-RAG: Combating LLM Hallucinations using Hypergraph-Driven Retrieval-Augmented Generationcited by 23

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Cited by year (2026 to 14 Oct)

Citing papers per year: 2026: 14.

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  1. 2026A Comprehensive Survey on Agent Skills: Taxonomy, Techniques, and Applicationscited by 18
  2. 2026HyperSkill: Self-Evolving LLM Agents via Hypergraph-Structured Skill Memorycited by 7
  3. 2026SAGE: A Self-Evolving Agentic Graph-Memory Engine for Structure-Aware Associative Memorycited by 2
  4. 2026PGMem: Tightly Coupled Persona-Memory Graph for Lifelong Personalized Agentscited by 2
  5. 2026MemCog: From Memory-as-Tool to Memory-as-Cognition in Conversational Agentscited by 1
  6. 2026T-Mem: Memory That Anticipates, Not Archivescited by 1
  7. 2026Beyond Retrieval: Analytic Memory for Multimodal Agentscited by 1
  8. 2026PolyMemDB: A Polyglot Database System for AI Memory Managementcited by 0
  9. 2026LINE Conversation History Retrieval for Personal Memory RAG: Evaluating Search Representations and Hybrid Retrievalcited by 0
  10. 2026EdgeMem: LLM-Free Agent Memory Construction and Retrieval via Evidence-Preserving Multi-Anchor Hypergraphcited by 0
  11. 2026Graph-Based Personalized Memory for LLM Agents: Representation, Evolution, Retrieval, and Evaluationcited by 0
  12. 2026SpeakerMem-R1: Speaker-Centered Dual-Track Memory for Multi-Party Dialoguecited by 0
2 more
  1. 2026Madeleine: Learning Involuntary Recall for Conversational Memory from Simulated Livescited by 0
  2. 2026Event-Centric Memory with Query-Aware Graph Augmentation for Long-Term Conversational Agentscited by 0

Similar, not cited

Close in wording, no citation either way

  1. 2026HiGMem: A Hierarchical and LLM-Guided Memory System for Long-Term Conversational Agents
  2. 2025SGMem: Sentence Graph Memory for Long-Term Conversational Agents
  3. 2026Beyond Memory Construction: Rethinking Memory Access for LLM-based Conversational Agents
  4. 2026TiMem: Temporal-Hierarchical Memory Consolidation for Long-Horizon Conversational Agents
  5. 2026Temporal Order Matters for Agentic Memory: Segment Trees for Long-Horizon Agents
  6. 2025Convomem Benchmark: Why Your First 150 Conversations Don't Need RAG
  7. 2026TAGGRAPH: Tag-Augmented Graphs for Graph Retrieval of Agent Persistent Histories
  8. 2026EngramaBench: Evaluating Long-Term Conversational Memory with Structured Graph Retrieval