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Anthropic security expert Nicholas Carlini tested and found that the Mythos model scanned 479 Linux vulnerabilities and wrote attack code within a few days, and uncovered 500 Ghost vulnerabilities within two weeks. In April 2026, over 700 websites were hacked due to the Ghost vulnerability. After the White House issued an emergency ban on Anthropic, Nicholas Carlini was sent to Washington to lobby officials and advocate for the release of the defense version model.