Mozilla reported that Anthropic's Mythos Preview model successfully identified 271 zero-day vulnerabilities in the latest release of Firefox 150. This number starkly contrasts with the 22 vulnerabilities detected by the previous Opus 4.6 model. Mozilla's Chief Technology Officer, Bobby Holley, highlighted the significance of this achievement, suggesting that it could shift the dynamics in the ongoing battle between cyberattackers and defenders. By analyzing the unreleased source code of Firefox, Mythos demonstrated its ability to uncover vulnerabilities that would typically require extensive manual effort or advanced automated techniques to find. Holley emphasized that this advancement could enable defenders to gain a substantial advantage in cybersecurity, although he did not specify the severity of the vulnerabilities detected. The conversation surrounding Mythos raises questions about the future of AI in cybersecurity, whether it will lead to more sophisticated hacking or bolster defense strategies.