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"The newer Mythos Preview checkpoint completed both our cyber ranges, solving the range 'The Last Ones' in 6 of 10 attempts and the previously unsolved 'Cooling Tower' in 3 of 10 attempts," the blog authors wrote. "This was the first time that a model completed the second of our two cyber ranges."

When Anthropic first announced Mythos Preview and Project Glasswing -- the cybersecurity testing alliance it formed with rival tech companies and AI labs, to which it gave limited access to Mythos -- last month, UK AISI evaluated it, finding that the model "represents a step up over previous frontier models in a landscape where cyber performance was already rapidly improving."

That third-party perspective helped balance claims that the hype around Mythos was either solely marketing or, at the other end, signaled a catastrophic shift in AI capabilities. The truth about what the model can do is likely somewhere in the middle.