Introduction: A New Era in AI CapabilityIn April 2026, Anthropic announced what may represent the most significant advancement in AI capability to date: Claude Mythos Preview. This isn't merely another incremental improvement in language model performance. Mythos represents a fundamental shift in what AI systems can accomplish—particularly in the realm of cybersecurity—so profound that Anthropic has chosen not to release it publicly.Instead, through an initiative called Project Glasswing, Anthropic is providing Mythos exclusively to 40+ lead...