I get the idea that they're using it for marketing. Of course they are. But to reduce it at "just marketing" feels either ill informed or outright wrong. Unless you have reasons to not believe the dozens of credentialed, well respected people in the field that have already shared their opinions after working with mythos. Plenty of them on all the social media sites.
And then there's the team at mozilla. They wrote a blog about this, and they've worked with anthropic before, using opus 4.6 and found and fixed 22 vulnerabilities. Then they worked with mythos and found and fixed 271 vulnerabilities. Unless you're going to accuse them of being shills, these are unquestionable numbers. The model is quantitatively better at this thing. And it matches what everyone is saying.
I think there are better things to accuse anthropic of, than that they are simply lying for marketing purposes. Of course they'll use this as a marketing campaign, but there's plenty of evidence out there that there is something there, that the model is simply better than previous generations at this. Don't fall for the cheap reductionist stuff, just because you don't like them, or feel that this is marketing fluff. It doesn't feel like a gimmick, even if it gets used to push their agenda. Something, something, propaganda often uses true statements as well.