Mozilla Used Anthropic’s Mythos to Find and Fix 271 Bugs in Firefox | TradeSphere
Mozilla Used Anthropic’s Mythos to Find and Fix 151 Bugs in Firefox Mozilla Used Anthropic’s Mythos to Find and Fix 271 Bugs in Firefox The Mozilla Foundation has revealed it tested Anthropic’s bug-finding “Mythos” AI model and feels the results it experienced represent a watershed moment for software defenders. The FOSS outfit on Tuesday reminded readers that it used Anthropic’s Opus 4.6 model to look for bugs in Firefox 148 and found 22 bugs. Mythos found 271 vulnerabilities in Firefox 150.
Understanding the Context
BrianFagioli writes: Mozilla says it used an early version of Anthropic's Claude Mythos Preview to comb through Firefox's code, and the results were hard to ignore. In Firefox 150, the team fixed 271 vulnerabilities identified during this effort, a number that would have been unthinkable not long ag... Mozilla used Anthropic's Mythos AI to find and fix 271 bugs in Firefox. The team warns AI will make the developer transition rough.
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Wired: Mozilla Used Anthropic’s Mythos to Find and Fix 271 Bugs in Firefox The FOSS outfit on Tuesday reminded readers that it used Anthropic’s Opus 4.6 model to look for bugs in Firefox 148 and found 22 bugs. Mythos found 271 vulnerabilities in Firefox 150. Mozilla CTO ... Mozilla shared some details that support Anthropic's Claude Mythos AI model as a way to protect critical services. Mozilla: Anthropic’s Mythos found 271 security vulnerabilities in Firefox 150 CTO says new AI model is “every bit as capable” as world’s best security researchers.
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A recent notable achievement comes from Mozilla, which, in collaboration with Anthropic, utilized the advanced capabilities of the Mythos AI model to identify and successfully patch an astounding 271 bugs within the Firefox browser. Anthropic's Claude Mythos model helped discover 271 security vulnerabilities on Firefox 150 after Mozilla took it out for a spin. In February, Anthropic's Frontier Red Team used Claude Opus 4.6 to find 22 vulnerabilities in Firefox in two weeks — more than were reported in any single month in all of 2025. Then Mythos arrived. Firefox 150, released today, patches 271 vulnerabilities found by Claude.