This now widely circulated claim is based on a line I wrote last week (https://economist.com/briefing/2026/06/14/donald-trumps-blocking-of-anthropic-is-capricious-and-chaotic). I accurately quoted Mark Warner, vice chair of the Senate intelligence committee, saying that the NSA chief had told him that Mythos “broke into almost all of our classified systems, not in weeks, but in hours”. But it would be a mistake to read that literally, I think. It surely depends on using Mythos alongside other tools under very particular conditions. I quoted it to give a sense of Mythos’ potency. But it was a mistake not to have added caveats.