Lines of terminal code scroll rapidly across a monitor in a locked Silicon Valley facility as Anthropic's Mythos AI model dissects a 27-year-old vulnerability buried deep within the OpenBSD operating system. The discovery of a zero-day exploit in the world’s most hardened software architecture prompted Anthropic to immediately sequester the technology. Through Project Glasswing, the firm granted exclusive access to twelve vetted defense contractors, permanently withdrawing its offensive AI capabilities from the public commons. "The publicly attributable impact of Glasswing itself remains limited so far," stated VulnCheck researcher Ian Garrity, noting the extreme secrecy surrounding the model. OpenAI immediately countered, offering its GPT-5.4-Cyber system to thousands of verified security teams. The artificial intelligence sector is executing a calculated cognitive enclosure. By framing their own software as too dangerous for civilian possession, private tech monopolies are erecting paid perimeters around the global digital infrastructure. Sovereign governments and enterprise boards are suddenly forced to rent their own cybersecurity from a fractured duopoly of Silicon Valley vendors, permanently delegating the defense of national intelligence to autonomous algorithms.