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Report: US Cybersecurity Agency Using Anthropic's Mythos for Vulnerability Testing

The audits have already uncovered a large number of software vulnerabilities, Reuters reported, as the agency expands AI use despite tensions with Anthropic.

  • On Monday, The Cybersecurity and Infrastructure Security Agency began using Anthropic's Mythos AI model to scan government code repositories for bugs that could expose systems to foreign spies and cybercriminals, sources said.
  • Tensions between Anthropic and the government eased following the private release of Mythos, which bypassed a formal Pentagon supply-chain risk designation that had previously blocked the company from government contracts.
  • CISA's Attack Surface Evaluation team is conducting the audits and has already uncovered a large number of vulnerabilities in government software repositories, according to sources familiar with the matter.
  • The National Security Agency has been testing Mythos in classified settings since April, with analysts reportedly impressed by the model's cybersecurity capabilities, according to reports.
  • Anthropic remains in a standoff with the White House over safeguards in its public version Fable, which triggered a global shutdown that was lifted only last week.
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WBUR broke the news in Boston, United States on Monday, July 6, 2026.
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