Feds freaked over Fable 5 after simple 'fix this code' prompt, not jailbreak

The Trump administration's export control ban on Anthropic's Fable 5 and Mythos 5 models was triggered by a simple three-word prompt—"Fix this code"—rather than an actual jailbreak, according to Katie Moussouris, the only outside expert who reviewed the research paper that prompted the ban. Moussouris argues the models were performing legitimate defensive cybersecurity functions by identifying and patching vulnerabilities, and that the restriction will harm security defenders while failing to prevent similar capabilities from emerging in competing systems like those from China.