Author

J. Sakuma

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#artificial intelligence Preprint Sep 2026

Are Vision-Language-Action Models Robust to One-Step Observation Perturbations?

This work investigates robustness to one-step perturbations applied at a single time step per episode and proposes CARE, which dynamically selects the execution length based on consistency with the previously predicted action chunk, which improves robustness with low computational overhead while preserving clean perfor...

Shojiro Yamabe, J. Sakuma · 0 citations

Preprint Aug 2026

Capability-Routed Guard: Defending Large Reasoning Models Against Reasoning-Centric Jailbreaks

Capability-Routed Guard is introduced, a model-agnostic inference-time guardrail for closed-source LRMs, where defenders cannot inspect hidden reasoning traces or modify model weights, and its components contribute complementary benefits, highlighting the importance of coordinated defense mechanisms for securing large...

Yi-Yong Liu, Yixin Wu, J. Sakuma · 0 citations