ChainCatcher report, according to Decrypt, Mozilla recently disclosed that Anthropic’s latest AI model, Claude Mythos, identified 271 security vulnerabilities during internal testing of the Firefox browser, with all vulnerabilities patched this week. For comparison, a previous version of Anthropic’s model detected only 22 security-sensitive vulnerabilities. Mozilla stated that all identified vulnerabilities fell within the scope of findings by top human researchers. Claude Mythos, officially released in March 2026, is Anthropic’s most powerful model to date for reasoning, coding, and cybersecurity, and is currently available on a limited basis through the “Project Glasswing” initiative to vetted partners including Amazon, Apple, and Microsoft.
Anthropic's Claude Mythos Identifies 271 Firefox Security Vulnerabilities
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Summary
Mozilla revealed that Anthropic's Claude Mythos uncovered 271 security vulnerabilities in Firefox during internal testing. The fixes were deployed this week. A previous Anthropic model had identified only 22 security-sensitive flaws. Mozilla stated that the issues fell within the range detectable by top human researchers. Claude Mythos, launched in March 2026, is Anthropic’s leading AI model for reasoning, coding, and cybersecurity. It is available to partners such as Amazon, Apple, and Microsoft through the 'Project Glasswing' initiative.
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