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.

Full report : A human error in Anthropic’s content management system accidentally exposed a draft blog that described the model.