When Anthropic unveiled its new Mythos model in April, it also delivered a stern warning to anyone developing software
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Now, security researchers for Mozilla’s Firefox browser are providing a closer look at what that process has looked like in practice, and what Mythos’ powers mean for software security at large.
Key facts
The results are striking: In April 2026, Firefox shipped 423 bug fixes, compared to 31 exactly a year earlier
To put this into context, Mozilla’s bug bounty program pays researchers who can find a bug in Firefox’s sandbox up to $20,000, the highest reward available
Speaking at a recent event, Anthropic CEO Dario Amodei was optimistic that the new tools would ultimately favor defenders
Notably, the Firefox team still isn’t using AI to fix the bugs, despite well-documented progress in AI coding tools
Summary
When Anthropic unveiled its new Mythos model in April, it also delivered a stern warning to anyone developing software. In a post published on Thursday, Mozilla said Mythos has unearthed a wealth of high-severity bugs, including some that had lain dormant in the code for more than a decade. That’s a significant improvement from what AI security tools were capable of even six months ago. “It is difficult to overstate how much this dynamic changed for us over a few short months,” the researchers wrote.