>But new A.I. models like Anthropic’s Mythos, which was announced last month, appear to be so good at finding such holes that Anthropic shared it only with a limited number of firms and government agencies in the United States and Britain.

Immediate distrust of the article. GPT 5.5 is out with nearly the same capability. The author might be parroting company marketing, unable to discern that a lot of this is much less complex than it seems. For all we know this group could have had a model examine some obscure line of code thousands of times until it found something.

GPT 5.5 does not have the same capabilities as Mythos. There is a separate 5.5-Cyber model which is the Mythos “equivalent”, but it is similarly restricted access like Mythos. Per OpenAI, the major difference is the built-in safeguards that 5.5 (and other models have), where 5.5-Cyber does not have these safeguards and is more “permissive” for security work.

See https://openai.com/index/gpt-5-5-with-trusted-access-for-cyb...

That is very clearly the claim of mythos though. The experience of projects that do have access to mythos though suggests that if you use the other models it's not going to find much of anything. Which is to say generally we believe it is marketing as you say however the claim that the reporter said is very clearly stated even if it's not right.

[dead]

Immediate distrust of the article… The author might be parroting company marketing, unable to discern that a lot of this is much less complex than it seems.

https://www.nytimes.com/by/dustin-volz

> I am based in The Times’s Washington bureau, and much of my focus is on the dealings of U.S. cybersecurity and intelligence agencies, including the National Security Agency, Central Intelligence Agency, Cybersecurity and Infrastructure Security Agency and the Federal Bureau of Investigation, as well as their counterparts abroad, chiefly in China, Russia, Iran and North Korea.

> My remit spans nation-state hacking conflict, digital espionage, online influence operations, election meddling, government surveillance, malicious use of A.I. tools and other related topics.

> Before joining The Times, I worked at The Wall Street Journal, where I spent eight years covering cyber conflict and intelligence. My recent work at The Journal included a series of articles revealing a major Chinese intrusion of America’s telecommunications networks that breached the F.B.I.’s wiretap systems and has been described as one of the worst U.S. counterintelligence failures in history. I have also worked at Reuters and National Journal, where I began my career in Washington chronicling congressional efforts to reform surveillance practices at the N.S.A. in the wake of the 2013 Edward Snowden disclosures.

> My work has been internationally recognized, including by the White House Correspondents’ Association, the Gerald Loeb Awards, the Society of Publishers in Asia and the Society for Advancing Business Editing and Writing.

What have you done lately?