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Anthropic’s Mythos Model Found Vulnerabilities in Classified US Government Systems, Official Says

The company said the model found flaws within hours, prompting a federal restriction and a debate over whether it weakens cyber defenses.

  • On Tuesday, a U.S. official confirmed that Anthropic's Mythos AI model identified vulnerabilities in secure U.S. government systems during testing via Project Glasswing, designed to protect critical software from "severe" fallout.
  • Democratic Sen. Mark Warner of Virginia revealed on June 11 that the tool breached classified systems "not in weeks but in hours," attributing the finding to Gen. Joshua Rudd, head of the National Security Agency and U.S. Cyber Command.
  • The administration issued a directive restricting foreign nationals from using Fable 5 and Mythos 5 models; Anthropic disabled them to comply while questioning whether the government's security concerns were warranted.
  • More than 100 cybersecurity experts from Adobe and Nvidia urged the administration to lift the directive, arguing in a letter that the models are "quite good" at finding flaws and essential for cyber defense.
  • This directive followed President Donald Trump's executive order establishing a framework to vet national security risks of advanced AI systems, with participation by developers remaining voluntary.
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Anthropic’s Mythos model found vulnerabilities in classified US government systems, official says

A U.S. official says one of Anthropic’s artificial intelligence models identified vulnerabilities in highly sensitive and secure U.S. government computer systems during a testing exercise.

·New York, United States
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newstarget.com broke the news on Tuesday, June 23, 2026.
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