My view on Mythos was and is somewhere in between. It’s real, it’s a wakeup call, and it’s not quite what some of the media coverage suggested. • Mythos is not going to allow an 8 year old to accidentally take down a power grid. (Someone writing for the NYT thought that was a real possibility). • The new Mozilla data certainly show that Mythos is better then its predecessors at detecting bugs. • But the UK AI institute’s study showed (and I still think this is true) that well-secured systems are not immediately at risk. • Consistent with all this the Mozilla report notes “Note that a number of these bugs are sandbox escapes, which would need to be combined with other exploits to achieve a full-chain Firefox compromise” I stand by my middle view; it’s not marketing hype, but it’s not quite as potent as some people thought. One other thing to note is that whatever advances there are not necessarily general to many or all domains; we will have to wait and see on that.
So Mythos was, indeed, not marketing hype. Remember this is a general purpose model that just happens to be good at finding exploits because good models are good at lots of things. Expect similar from OpenAI & Google. And from open models in 8 months. https://hacks.mozilla.org/2026/05/behind-the-scenes-hardening-firefox/
