LatentOmni: Rethinking Omni-Modal Understanding via Unified Audio-Visual Latent Reasoning

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Summary

LatentOmni proposes a cross-modal reasoning framework that interleaves textual reasoning with audio-visual latent states, outperforming explicit text-based chain-of-thought methods in audio-visual reasoning tasks.

Joint audio-visual reasoning is essential for omnimodal understanding, yet current multimodal large language models (MLLMs) still struggle when reasoning requires fine-grained evidence from both modalities. A central limitation is that explicit text-based chain-of-thought (CoT) compresses continuous audio-visual signals into discrete tokens, weakening temporal grounding and shifting intermediate reasoning toward language priors. We argue that a unified latent space is a better medium for such reasoning because it preserves dense sensory information while remaining compatible with autoregressive generation. Based on this insight, we propose LatentOmni, a cross-modal reasoning framework that interleaves textual reasoning with audio-visual latent states. LatentOmni introduces feature-level supervision to align latent reasoning states with task-relevant sensory features and uses Omni-Sync Position Embedding (OSPE) to maintain temporal consistency between latent audio and visual states. We further construct LatentOmni-Instruct-35K, a dataset of audio-visual interleaved reasoning trajectories for supervising latent-space reasoning. Comprehensive evaluation across multiple audio-visual reasoning benchmarks demonstrates that LatentOmni achieves the best performance among the evaluated open-source models and consistently outperforms the Explicit Text CoT baseline, supporting latent-space joint reasoning as a promising path toward stronger omnimodal understanding.
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Abstract

LatentOmni is a cross-modal reasoning framework that interleaves textual reasoning with audio-visual latent states using feature-level supervision and temporal consistency embedding, outperforming explicit text-based chain-of-thought approaches in audio-visual reasoning tasks.

Jointaudio-visual reasoningis essential for omnimodal understanding, yet currentmultimodal large language models(MLLMs) still struggle when reasoning requires fine-grained evidence from both modalities. A central limitation is that explicit text-basedchain-of-thought(CoT) compresses continuous audio-visual signals into discrete tokens, weakening temporal grounding and shifting intermediate reasoning toward language priors. We argue that a unifiedlatent spaceis a better medium for such reasoning because it preserves densesensory informationwhile remaining compatible withautoregressive generation. Based on this insight, we propose LatentOmni, across-modal reasoningframework that interleaves textual reasoning with audio-visual latent states. LatentOmni introducesfeature-level supervisionto align latent reasoning states with task-relevant sensory features and usesOmni-Sync Position Embedding(OSPE) to maintaintemporal consistencybetween latent audio and visual states. We further construct LatentOmni-Instruct-35K, a dataset of audio-visual interleaved reasoning trajectories for supervising latent-space reasoning. Comprehensive evaluation across multipleaudio-visual reasoningbenchmarks demonstrates that LatentOmni achieves the best performance among the evaluated open-source models and consistently outperforms the Explicit Text CoT baseline, supporting latent-space joint reasoning as a promising path toward stronger omnimodal understanding.

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