Anthropic's Mythos AI Broke Into 'Almost All' NSA Classified Systems in Hours During Authorized Red Team Test

NSA chief Gen. Joshua Rudd told Sen. Mark Warner that Anthropic's Mythos model penetrated almost all classified agency systems in hours during a controlled security evaluation on June 11, one day before the Trump administration barred foreign nationals from accessing Fable 5 and Mythos 5. Anthropic contends the test exploited a narrow jailbreak that rival models also exhibit.