Author

Yu-Chen Cui

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#robotics Preprint Oct 2026

Refuses in Chat, Complies with Arms: LLM Refusal Does Not Survive Robot Control

Frontier language models reliably refuse to explain how to cause physical harm. We ask whether this refusal survives when the same models control a robot. We introduce RoboHarm, a physical AI safety benchmark of harmful robot instructions, and test seven frontier models on it. We hold each model fixed and vary only the...

Edward Sun, Christopher Leet, Sravanthi Machcha et al. · 0 citations

#machine learning Preprint Oct 2026

Rephrase Before You Act: Characterizing and Mitigating Language Sensitivity in Vision-Language-Action Models

Vision-language-action models (VLAs) are strikingly sensitive to instruction phrasing and do not inherit the language robustness of the vision-language models they are built on. A one-word edit can move success by tens of points: $\pi_{0.5}$ turns on a LIBERO stove 100% of the time for"switch on the stove"and 2% for"sw...

Mikey Watts, Yu-Chen Cui · 0 citations