EchoWM: Open and Enterable Omnimodal World Models

Songchun Zhang; Yaowei Li; Junhao Zhuang; Weiyang Jin; Haoyu Wang; Xin Lu; Yilang Sun; Shiyi Zhang; Haoran Li; Xiaoxiao Ma; Yuming Li; Yijun Liu; Yaofeng Su; Yanwen Ma; Haoyu Wu; Zihan Su; Yue Ma; Lvmin Zhang; Haoyang Huang; Zeyue Xue; Anyi Rao; Nan Duan

arXiv · 2608.23189

EchoWM: Open and Enterable Omnimodal World Models

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Abstract

We present EchoWM, an omnimodal world model for enterable generative media that responds to continuous navigation while jointly generating 720p video, environmental sound, music and speech. We organize interaction around camera intent: in first-person scenes, it specifies observer motion, while in third-person scenes, camera--character dynamics are learned from data without view-specific controllers. Discrete commands and continuous poses are mapped to a shared metric-scale relative 6-DoF trajectory, with dataset-level calibration preserving motion magnitude across heterogeneous data. To jointly learn audio-visual generation and trajectory control, we construct a complementary data engine and adopt progressive training followed by autoregressive post-training for long-horizon generation. Extensive evaluations show that \model achieves strong trajectory following and high visual quality on public world-model benchmarks, supporting both first- and third-person interaction across varied subjects, and maintaining synchronized environmental sound and speech over long-horizon generation.

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Songchun Zhang, Yaowei Li, Junhao Zhuang, Weiyang Jin, Haoyu Wang, Xin Lu, Yilang Sun, Shiyi Zhang, Haoran Li, Xiaoxiao Ma, Yuming Li, Yijun Liu, Yaofeng Su, Yanwen Ma, Haoyu Wu, Zihan Su, Yue Ma, Lvmin Zhang, Haoyang Huang, Zeyue Xue, Anyi Rao, Nan Duan. 2026-08-24. EchoWM: Open and Enterable Omnimodal World Models. https://arxiv.org/abs/2608.23189

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