Anthropic didn’t intend to introduce Mythos this way. Details of what it calls its most capable AI model yet surfaced through a data leak in its content management system (CMS), revealing a LLM with sharply improved reasoning and coding skills.
The data leak, which was the result of the company’s staffers inadvertently exposing material about the LLM, including a draft blog post about it, via a publicly accessible data repository, was first identified by independent security researchers last week.
Following disclosure of the issue, Anthropic restricted public access to the data store, only to later attribute the exposure to a configuration error in its CMS and confirm the existence of the model to Fortune, which was the first to report the leak.
Apple-focused leaker M1Astra also flagged the exposure, archiving a copy of a draft Anthropic blog post about Mythos on X before access was restricted.
In that draft, Anthropic itself struck a cautious tone, signaling concern about the model’s potential implications on cybersecurity.
“In preparing to release Claude Mythos, we want to act with extra caution and understand the risks it poses — even beyond what we learn in our own testing,” the company wrote, adding that it is particularly focused on assessing near-term cybersecurity risks.
Source: CSO Online