mlsanityData to 14 Oct 2026

APEX-MEM: Agentic Semi-Structured Memory with Temporal Reasoning for Long-Term Conversational AI

arXiv 2604.14362 ↗First posted 15 Apr 2026cs.CL cs.AI cs.IRcited by 17

On the map: LLM reasoning → Reasoning for agents, planning and code

also in 1 more
Abstract (arXiv)

Large language models still struggle with reliable long-term conversational memory: simply enlarging context windows or applying naive retrieval often introduces noise and destabilizes responses. We present APEX-MEM, a conversational memory system that combines three key innovations: (1) a property graph which uses domain-agnostic ontology to structure conversations as temporally grounded events in an entity-centric framework, (2) append-only storage that preserves the full temporal evolution of information, and (3) a multi-tool retrieval agent that understands and resolves conflicting or evolving information at query time, producing a compact and contextually relevant memory summary. This retrieval-time resolution preserves the full interaction history while suppressing irrelevant details. APEX-MEM achieves 88.88% accuracy on LOCOMO's Question Answering task and 86.2% on LongMemEval, outperforming state-of-the-art session-aware approaches and demonstrating that structured property graphs enable more temporally coherent long-term conversational reasoning.

Key facts. Cited by 17 papers in the map (data through 14 Oct 2026). Placed in Reasoning for agents, planning and code, one of 17 directions in LLM reasoning. Builds on 16 of its 23 references that are in the map. First posted on arXiv 15 Apr 2026.

Builds on

16 of 23 references.

Closest ancestors · 1

Same direction, newest first

  1. 2025Hierarchical Memory for High-Efficiency Long-Term Reasoning in LLM Agents23 Jul

Other references · 15

  1. 2023MemGPT: Towards LLMs as Operating Systemscited by 1,389
  2. 2025A-MEM: Agentic Memory for LLM Agentscited by 1,063
  3. 2025Mem0: Building Production-Ready AI Agents with Scalable Long-Term Memorycited by 779
  4. 2024LongMemEval: Benchmarking Chat Assistants on Long-Term Interactive Memorycited by 707
  5. 2023MemoryBank: Enhancing Large Language Models with Long-Term Memorycited by 556
  6. 2025Zep: A Temporal Knowledge Graph Architecture for Agent Memorycited by 400
  7. 2025MIRIX: Multi-Agent Memory System for LLM-Based Agentscited by 173
  8. 2024A Human-Inspired Reading Agent with Gist Memory of Very Long Contextscited by 146
  9. 2025Context Length Alone Hurts LLM Performance Despite Perfect Retrievalcited by 127
  10. 2025MemInsight: Autonomous Memory Augmentation for LLM Agentscited by 85
  11. 2025SealQA: Raising the Bar for Reasoning in Search-Augmented Language Modelscited by 75
  12. 2025What Deserves Memory: Adaptive Memory Distillation for LLM Agentscited by 48
3 more
  1. 2024Toward Conversational Agents with Context and Time Sensitive Long-term Memorycited by 8
  2. 2024Self-Consistency Falls Short! The Adverse Effects of Positional Bias on Long-Context Problemscited by 7
  3. 2025Semantic Anchoring in Agentic Memory: Leveraging Linguistic Structures for Persistent Conversational Contextcited by 5

Built on by

Cited by year (2026 to 14 Oct)

Citing papers per year: 2026: 17.

17 papers.

Sort:

By area:

  1. 2026TOKI: A Bitemporal Operator Algebra for Contradiction Resolution in LLM-Agent Persistent Memorycited by 8
  2. 2026Fortunate Recall: Ontology-Driven Memory Lifecycle Management for Persistent Coherence in LLMscited by 3
  3. 2026Compute Globally, Materialize Locally: The Memory Contract of Sparse Event-KVcited by 2
  4. 2026VoiceMem: Streaming Dual-Brain Memory for Real-Time Interactioncited by 2
  5. 2026When Stories Evolve: Benchmarking LLM Storytelling Across Agent Architectures in Open-Ended World Simulationscited by 1
  6. 2026CABLE: Extending the Reach of Memory Retrieval via Complementary Antecedent-Based Linking and Expansioncited by 1
  7. 2026JustMem: Just-Enough Memory Access for Long-Term Conversationscited by 1
  8. 2026Memory Control Signals Emerge Before Action in Long Horizon Agentscited by 1
  9. 2026Governed Persistent Memory: Source-Bound State Semantics and Fail-Closed Release for Long-Horizon Agentscited by 0
  10. 2026Entity-Memory Graph Retrieval Improves Evidence Coverage in Long-Conversation Question Answeringcited by 0
  11. 2026Graph-Based Personalized Memory for LLM Agents: Representation, Evolution, Retrieval, and Evaluationcited by 0
  12. 2026ROAM: Robust Organization of Atomic Memories for Agents through Semantic Relationscited by 0
5 more
  1. 2026Propose, Verify, Commit: Evidence-Grounded Memory for Long-Horizon Multi-Actor Conversationscited by 0
  2. 2026Contract Memory Compiler: Resolve, Then Traversecited by 0
  3. 2026Personalized State-Transition-Aware Memory for Clinical Agentscited by 0
  4. 2026CAVE-Mem: Boundary-Aware Experience Validation for Memory Searchcited by 0
  5. 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. 2026AgentMemBench: A Systematic Benchmark for Evaluating Long-Term Memory Management Strategies in Conversational AI Agents
  2. 2026Chronos: Temporal-Aware Conversational Agents with Structured Event Retrieval for Long-Term Memory
  3. 2026AdaMem: Adaptive User-Centric Memory for Long-Horizon Dialogue Agents
  4. 2025LiCoMemory: Lightweight and Cognitive Agentic Memory for Efficient Long-Term Reasoning
  5. 2026Temporal Order Matters for Agentic Memory: Segment Trees for Long-Horizon Agents
  6. 2026MemMachine: A Ground-Truth-Preserving Memory System for Personalized AI Agents
  7. 2026MemOps: Benchmarking Lifecycle Memory Operations in Long-Horizon Conversations
  8. 2025Hindsight is 20/20: Building Agent Memory that Retains, Recalls, and Reflects