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Motus: A Unified Latent Action World Model

Canonical reference. 83% of citing Pith papers cite this work as background.

88 Pith papers citing it
Background 83% of classified citations
abstract

While a general embodied agent must function as a unified system, current methods are built on isolated models for understanding, world modeling, and control. This fragmentation prevents unifying multimodal generative capabilities and hinders learning from large-scale, heterogeneous data. In this paper, we propose Motus, a unified latent action world model that leverages existing general pretrained models and rich, sharable motion information. Motus introduces a Mixture-of-Transformer (MoT) architecture to integrate three experts (i.e., understanding, video generation, and action) and adopts a UniDiffuser-style scheduler to enable flexible switching between different modeling modes (i.e., world models, vision-language-action models, inverse dynamics models, video generation models, and video-action joint prediction models). Motus further leverages the optical flow to learn latent actions and adopts a recipe with three-phase training pipeline and six-layer data pyramid, thereby extracting pixel-level "delta action" and enabling large-scale action pretraining. Experiments show that Motus achieves superior performance against state-of-the-art methods in both simulation (a +15% improvement over X-VLA and a +45% improvement over Pi0.5) and real-world scenarios(improved by +11~48%), demonstrating unified modeling of all functionalities and priors significantly benefits downstream robotic tasks.

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2026 88

representative citing papers

CreFlow: Corrective Reflow for Sparse-Reward Embodied Video Diffusion RL

cs.CV · 2026-05-14 · conditional · novelty 7.0

CreFlow combines LTL compositional rewards with credit-aware NFT and corrective reflow losses in online RL to improve embodied video diffusion models, raising downstream task success by 23.8 percentage points on eight bimanual manipulation tasks.

JailWAM: Jailbreaking World Action Models in Robot Control

cs.RO · 2026-04-07 · unverdicted · novelty 7.0

JailWAM is the first dedicated jailbreak framework for World Action Models, achieving 84.2% attack success rate on LingBot-VA in RoboTwin simulation and enabling safety evaluation of robotic AI.

RynnWorld-4D: 4D Embodied World Models for Robotic Manipulation

cs.RO · 2026-07-07 · conditional · novelty 6.0

A tri-branch diffusion model co-generates RGB, depth, and optical flow from a single RGB-D image, and an inverse dynamics head on its internal latents achieves state-of-the-art bimanual manipulation success rates.

IOI: Decoupling Kinematics and Physics for Interactive World Models

cs.RO · 2026-06-22 · unverdicted · novelty 6.0

IOI decouples deterministic kinematics from stochastic physics in interactive world models by rendering forward-kinematics trajectories into multi-view projections that guide a video generator, achieving SOTA fidelity and OOD generalization on RoboTwin.

T-Rex: Tactile-Reactive Dexterous Manipulation

cs.RO · 2026-06-15 · unverdicted · novelty 6.0

T-Rex introduces a large tactile dataset and MoT architecture that achieves over 30% higher success rates than baselines on 12 tasks requiring force control and deformable object handling.

Next Forcing: Causal World Modeling with Multi-Chunk Prediction

cs.CV · 2026-06-09 · unverdicted · novelty 6.0

Next Forcing augments video generation models with auxiliary multi-chunk prediction modules to achieve faster training convergence, higher accuracy at high frame rates, and 2x faster inference on world modeling benchmarks.

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