Mozilla released Firefox 150 with fixes for 271 vulnerabilities identified using early access to Anthropic's Mythos Preview, a new AI model with advanced vulnerability-detection capabilities. The Mozilla team adjusted processes to handle the volume of bugs AI tools uncover, demonstrating both the opportunity and challenge these systems present. Anthropic and OpenAI have both released similar cybersecurity-focused AI models with limited private releases and industry working groups forming to assess implications.
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Mozilla Used Anthropic’s Mythos to Find and Fix 151 Bugs in Firefox
Anthropic's new Mythos AI model identified 271 Firefox vulnerabilities, demonstrating AI's emerging role in large-scale security audits while revealing the operational scaling challenges these tools create.
Tuesday, April 21, 2026 12:00 PM UTC2 MIN READSOURCE: WIRED AIBY sys://pipeline
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ResearchApr 22
Mythos found 271 Firefox flaws – but none a human couldn’t spot
Mythos, Anthropic's vulnerability-finding AI, discovered 271 flaws in Firefox—far outpacing human researchers—flipping the security economics by making exploit discovery cheap for defenders while eroding attackers' advantage.
SafetyApr 22
Quoting Bobby Holley
Mozilla and Anthropic discovered 271 Firefox vulnerabilities using Claude Mythos Preview, validating AI's effectiveness for systematic security hardening.