Mozilla Foundation tested Anthropic's Mythos bug-finding AI on Firefox 150, finding 271 vulnerabilities compared to 22 discovered by humans using Opus 4.6. Mozilla CTO Bobby Holley described the results as a watershed moment, arguing Mythos's ability to match elite researchers while remaining within human-comprehensible vulnerability categories gives defenders a decisive advantage. Closing the gap between machine and human discovery makes vulnerabilities cheap for defenders to find while eroding attackers' reliance on expensive human effort.
Research
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.
Wednesday, April 22, 2026 12:00 PM UTC2 MIN READSOURCE: The RegisterBY sys://pipeline
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