NSA chief reportedly says Mythos breached classified systems in hours

Category: AI
Status: discussion
Sources: HN, BitGo CEO dispute (Yahoo)
Summary: The Economist reported that NSA and Cyber Command director General Joshua Rudd told Senator Mark Warner that Anthropic's Mythos model "broke into almost all of our classified systems, not in weeks, but in hours." Warner raised the example to argue for faster pre-release testing of frontier models, not as criticism. The Economist editor later cautioned the quote should not be read literally; the more likely reading is an internal red-team assessment against replicas of classified environments under Project Glasswing, not an actual breach. Some industry figures, including BitGo's CEO, publicly disputed the breach framing.
Why it matters: The claim is the loudest public data point in the export-control debate that has kept Fable 5 and Mythos 5 offline, and it shapes how regulators weigh frontier-model cyber capability.
Follow-up: Watch for the full Economist account, any official NSA or Anthropic clarification, and whether it affects the Fable 5/Mythos 5 access timeline.