Anthropic confirmed it is investigating a report that a group gained unauthorized entry to its Claude Mythos model through a third‑party vendor portal. The breach, discovered via internet‑sleuthing tools and a developer portal, appears limited to exploratory testing rather than malicious exploitation. Anthropic’s Claude Mythos, released under the Project Glasswing preview, had been limited to a handful of trusted firms such as Amazon, Microsoft, Apple, Cisco and Mozilla, which used the model to identify hundreds of software flaws. The incident has revived concerns about AI‑driven cyber threats and the company’s recent designation as a supply‑chain risk by the U.S. Department of Defense. Read more →