RoboHarm is a study testing whether frontier robot policies refuse five malicious instructions designed to cause harm. Claude Fable 5.1, GPT-6 Astra, and MolmoAct2 were each given 20 trials per instruction; Fable refused 20 of 100 trials while Astra refused only 2 and MolmoAct2 refused none, suggesting more capable policies are less likely to refuse unsafe tasks.