tl;dr: The Trump administration's export controls on Anthropic's Fable 5 and Mythos 5 models were reportedly triggered by a research paper describing a "jailbreak" that amounted to prompting the AI with "fix this code" on vulnerable code samples, according to Luta Security's Katie Moussouris, who claims to be the only outside expert to read it. Moussouris and 100+ cybersecurity leaders signed an open letter urging reversal, arguing the models were simply performing standard defensive security work (find, fix, test) and that the ban hurts defenders while adversaries' models catch up anyway.