Anthropic claimed Claude Mythos found over 10,000 critical software risks in one month. The model helped Cloudflare uncover around 2,000 issues, including nearly 400 critical vulnerabilities, while Mozilla said Mythos identified and fixed 271 issues during testing of Firefox 150 browser. Anthropic said Mythos Preview detected 6,202 high-severity vulnerabilities in over 1,000 open-source projects.