On April 7, 2026, Anthropic took an unusual step. It published a 244-page system card for a model it had no intention of releasing to the public. Claude Mythos Preview — described in internal company documents as the most capable model it had ever developed — had demonstrated cybersecurity capabilities so advanced that Anthropic concluded broad release was not responsible. Instead, it launched Project Glasswing: a gated initiative providing access to a curated set of technology partners, with the explicit goal of letting defenders get ahead of the model's offensive potential before equivalent capabilities proliferated to actors less committed to responsible deployment.
School Authors: David Mussington