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‼️🚨 BREAKING: NSA and Cyber Command chief, Gen. Joshua Rudd, said Mythos "broke into almost all of our classified systems, not in weeks, but in hours." A week after Washington forced Anthropic to disable its most powerful models, the likely reason is sharpening. According to reports Senator Mark Warner told a hearing that the NSA and Cyber Command chief said the firm's Mythos model penetrated almost all of the agency's classified systems within hours during authorized testing. That demonstration sits behind the June 12 Commerce Department directive, which barred every foreign national, including Anthropic's own non-citizen employees, from using Fable 5 and Mythos 5, leading the company to pull both for all customers. It is the first time the US has export-controlled an AI model itself rather than the chips behind it. Anthropic disputes the rationale, calling the cited trigger a narrow jailbreak that other models like GPT-5.5 also exhibit and the recall an overreaction.