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OmniKVQuant: KV Cache Quantization for Omni-LLMs

arxiv.org/abs/2609.11582

Updated 50 min ago · first seen 11 Sept 2026

paper_01M294H2B9XGMVV3RQQDYDDX9K

Published
11 Sept 2026
T1 · 50 min ago
arXiv
2609.11582
T1 · 50 min ago
Category
cs.CV
T1 · 50 min ago

Abstract

As Omni-modal large language models (Omni-LLMs) take in audio, video and text together, their KV cache memory cost grows. KV cache quantization is the de facto approach in text-only LLMs, but its application to Omni-LLMs remains unexplored. In this paper, we analyze how TurboQuant, a representative rotation-based KV cache quantization method, behaves on multimodal caches and identify two critical issues: temporal key drift and heterogeneous value geometry. To address these, we propose OmniKVQuant, a training-free framework that (i) sets the key quantization range over each short window of the input stream; and (ii) rotates values separately per modality. On Qwen2.5-Omni and Qwen3-Omni, OmniKVQuant enables 2-bit KV caches while substantially preserving performance across seven audio-visual benchmarks. We further provide a fused Triton decode kernel that unpacks the 2-bit cache during attention, so no dense FP16 cache is ever built. Code: https://github.com/kaistmm/OmniKVQuant

Authors 5

Suho Yoo, Hyunjong Ok, Jongmin Choi, Jihoo Jung, Joon Son Chung

Specification

Official page

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

Arxiv announce type
new

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

arXiv id
2609.11582

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

Categories
cs.CV

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

PDF

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

Primary category
cs.CV

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

Published
11 Sept 2026

Source:arXiv (Atom API + RSS)T1observed 50 min agohigh

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Provenance

Attributed facts

9

Source tiers

T19

Freshest observation

50 min ago

Conflicts

None