Claude Fable 5 and Mythos 5 “abruptly disabled” after US gov. ban

Anthropic has been ordered by the US government to disable its Fable 5 and Mythos 5 AI models globally after officials raised national security concerns that a jailbreak could turn the models into powerful vulnerability‑discovery tools; the report highlights the models' dual‑use nature, notes vendors and Mozilla have used similar AI capabilities to surface many bugs, and explains that older Claude models remain available while access to the highest‑capability models is restricted.