---
title: "Mnemis — paper by Tang et al. (2026) — summary and ideas"
description: "Long-running LLM agents need a memory of past conversations. 35 references, cited by 1 paper here."
authors: ["Zihao Tang", "Xin Yu", "Ziyu Xiao", "Zengxuan Wen", "Zelin Li", "Jiaxi Zhou", "Hualei Wang", "Haohua Wang", "Haizhen Huang", "Weiwei Deng", "Feng Sun", "Qi Zhang"]
year: 2026
venue: "Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)"
source: "https://aclanthology.org/2026.acl-long.1096/"
doi: "10.18653/v1/2026.acl-long.1096"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/tang-2026-mnemis-dual-route-retrieval-hierarchical/"
---
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# Mnemis: Dual-Route Retrieval on Hierarchical Graphs for Long-Term LLM Memory

**Authors:** [Zihao Tang](https://md.research.elamur.ai/free/en/authors/zihao-tang/), [Xin Yu](https://md.research.elamur.ai/free/en/authors/xin-yu/), Ziyu Xiao, Zengxuan Wen, Zelin Li, Jiaxi Zhou, Hualei Wang, Haohua Wang, [Haizhen Huang](https://md.research.elamur.ai/free/en/authors/haizhen-huang/), [Weiwei Deng](https://md.research.elamur.ai/free/en/authors/weiwei-deng/), [Feng Sun](https://md.research.elamur.ai/free/en/authors/feng-sun/) and [Qi Zhang](https://md.research.elamur.ai/free/en/authors/qi-zhang/) · **Year:** 2026 · **Venue:** [Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)](https://md.research.elamur.ai/free/en/venues/acl/) ([ACL 2026](https://md.research.elamur.ai/free/en/venues/acl/2026/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2026.acl-long.1096/) · [PDF](https://aclanthology.org/2026.acl-long.1096.pdf) · [DOI 10.18653/v1/2026.acl-long.1096](https://doi.org/10.18653/v1/2026.acl-long.1096) · [OpenAlex](https://openalex.org/W7166882589)

**Citations:** 0 citations (OpenAlex, 2026-10-14) · 1 in our library, of the 149,439 papers whose bibliographies we read

## Summary
Long-running LLM agents need a memory of past conversations. Current RAG and Graph-RAG systems retrieve that memory mainly by similarity, through embeddings or BM25. This fast, "System-1" style of lookup misses evidence that is only weakly related to the query on the surface. It also struggles when a question needs a complete, global view of the history, such as listing every city a person visited. Mnemis, from Microsoft and built on Graphiti, adds a second, deliberate "System-2" route called Global Selection. Memory lives in two structures:
- **Base graph:** stores Episodes, Entities, Edges and Episodic Edges, with improved extraction, reflection and de-duplication, and supports similarity search.
- **Hierarchical graph:** an LLM groups entities bottom-up into multi-level Categories. At query time the LLM browses these categories from the top layer down to select relevant entities and everything linked to them.

Results from both routes are merged and re-ranked. With GPT-4.1-mini, Mnemis reaches state-of-the-art scores on LoCoMo and LongMemEval-S. This shows that structured, top-down browsing complements similarity retrieval for long-term memory.

## Key points
- **Main results:** with GPT-4.1-mini, Mnemis scores 93.9 on LoCoMo and 91.6 on LongMemEval-S. Code is released at github.com/microsoft/Mnemis.
- **Hierarchy construction rules:** the hierarchy follows three principles: Minimum Concept Abstraction, Many-to-Many Mapping (a node may have several parent Categories), and a Compression Efficiency Constraint (each Category needs a minimum number of children, and higher layers cannot have more Categories than lower ones).
- **Ablation on LoCoMo (overall LLM-as-a-Judge score):**
  - System-1 Re-ranked: 89.1
  - System-2 Only: 87.7
  - Both routes combined: 93.3, with the largest gains on Multi-Hop (91.8) and Temporal (90.3) questions.
- **Re-rankers:** the main experiments use Qwen3-Reranker-8B. Smaller re-rankers cost little accuracy: Qwen3-Reranker-0.6B scores 92.6 and BGE-Reranker-V2-M3 scores 92.7, against 93.3 for the 8B model.
- **Difference from GraphRAG:** GraphRAG builds single-parent communities with community detection and answers per community. Mnemis allows many-to-many category membership and produces one answer from the aggregated retrieved context.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

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## Cite

Cite as: Zihao Tang, Xin Yu, Ziyu Xiao, Zengxuan Wen, Zelin Li, Jiaxi Zhou, Hualei Wang, Haohua Wang, Haizhen Huang, Weiwei Deng, Feng Sun and Qi Zhang. 2026. Mnemis: Dual-Route Retrieval on Hierarchical Graphs for Long-Term LLM Memory. Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers).

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{tang2026mnemis,
  title = {{Mnemis: Dual-Route Retrieval on Hierarchical Graphs for Long-Term LLM Memory}},
  author = {Zihao Tang, Xin Yu, Ziyu Xiao, Zengxuan Wen, Zelin Li, Jiaxi Zhou, Hualei Wang, Haohua Wang, Haizhen Huang, Weiwei Deng, Feng Sun and Qi Zhang},
  booktitle = {Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  year = {2026},
  doi = {10.18653/v1/2026.acl-long.1096},
  url = {https://doi.org/10.18653/v1/2026.acl-long.1096}
}
```

- [← previous MMErroR: A Benchmark for Erroneous Reasoning in Vision-Language Models](https://md.research.elamur.ai/free/en/papers/shi-2026-mmerror-benchmark-erroneous-reasoning-vision/)
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- [↑ back to papers of 2026](https://md.research.elamur.ai/free/en/papers/2026/page/15/)

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*Updated 31 October 2026*