Sen. Mark Warner says NSA/Cyber Command chief Gen. Joshua Rudd told him: during an authorized red-team test, Anthropic's Mythos (CLAUDE) breached almost all NSA classified systems, "not in weeks, but in hours."
This was sanctioned testing, not a real breach, but the speed alone is the headline. Mythos was never public, limited to ~200 vetted partners under Project Glasswing. Both Mythos and Fable 5 remain suspended after a June 12 export control order.
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