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Paper · 2609.29735 · September 2026

C3M: Cross-Session Multimodal Memory Maintenance for Long-Horizon Tasks

Yan Wang, Zhen Bi, Xueshu Chen, Jungang Lou, Zihao Xue, Zhenfang Liu, Jiefu Li, Jayden Chen

arXiv · PDF

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Abstract

Long-horizon tasks require preserving and later recovering cross-session evidence under a bounded, query-blind memory budget. Existing compression can discard fine-grained visual cues or conflate semantically similar but incompatible observations. We present C3M, a cross-session multimodal memory organization that maintains a bounded active index over persistent source text-image evidence. Relation-aware updates consolidate safe redundancy while preserving complementary and incompatible records. At query time, budgeted routing selects useful index pages and expands their associated source evidence under a fixed reader budget. Together, these mechanisms establish a compact, provenance-preserving multimodal memory organization for cross-session long-horizon tasks, retaining temporal distinctions and source links required for reliable downstream reasoning. Code is available at https://github.com/HuzhouNLP/C3M.

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