New Claude Mythos becomes the first AI model to clear all cyberattack simulations from Britain's AI safety agency (opens in new tab)

The UK's AI Security Institute has revised its estimate of how fast AI cyber capabilities are doubling—twice. First from eight months down to 4.7, and now Anthropic's Claude Mythos Preview and OpenAI's GPT-5.5 have blown past even that accelerated timeline. Mythos is the first model to clear all of AISI's attack simulations. Anthropic's head of red teaming, Logan Graham, warns, "Within a year, Mythos will probably look quite dumb." The article New Claude Mythos becomes the first AI model to c...