Dynin-Omni: Omnimodal Unified Large Diffusion Language Model

TL;DR

Dynin-Omni is a pioneering masked-diffusion-based model that unifies text, image, speech, and video understanding and generation within a single architecture, enabling iterative refinement across modalities.

Contribution

It introduces the first omnimodal foundation model using masked diffusion over a shared token space, surpassing previous models in diverse multimodal benchmarks.

Findings

Achieves state-of-the-art results on 19 multimodal benchmarks.

Outperforms existing open-source unified models across multiple tasks.

Demonstrates the effectiveness of masked diffusion as a universal modeling paradigm.

Abstract

We present Dynin-Omni, the first masked-diffusion-based omnimodal foundation model that unifies text, image, and speech understanding and generation, together with video understanding, within a single architecture. Unlike autoregressive unified models that serialize heterogeneous modalities, or compositional unified models that require orchestration with external modality-specific decoders, Dynin-Omni natively formulates omnimodal modeling as masked diffusion over a shared discrete token space, enabling iterative refinement under bidirectional context. Dynin-Omni adopts a multi-stage training strategy with model-merging-based modality expansion and omnimodal alignment. We evaluate Dynin-Omni across 19 multimodal benchmarks spanning language reasoning, image generation and editing, video understanding, and speech recognition and synthesis. Dynin-Omni achieves 87.6 on GSM8K, 1733.6 on MME-P, 61.4 on VideoMME, 0.87 on GenEval, and 2.1 WER on LibriSpeech test-clean, consistently outperforming existing open-source unified models while remaining competitive with strong modality-specific expert systems. These results demonstrate the potential of masked diffusion as a unified paradigm for any-to-any modeling, providing a flexible foundation for real-time omnimodal systems, unified cross-modal retrieval and generation, and embodied multimodal agents.