Claude Mythos: An Updated Review — From Leaked Draft to Project Glasswing April 8, 2026 Abstract Ten days after Anthropic accidentally exposed its next-generation AI model through a CMS misconfiguration, the company formalized what the leak revealed: on April 7, 2026, Anthropic officially announced Claude Mythos Preview and launched Project Glasswing, a cybersecurity initiative giving 40 carefully vetted organizations exclusive access to the model. This review synthesizes all information available as of April 8, 2026 — integrating the original March 26 leak findings with the confirmed benchmark data, partner details, pricing, and safety assessment released at official launch.