Cybersecurity analysis: GPT-5.5 reaches a similar level of performance as Mythos Preview and is the second model to solve a multi-step cyberattack simulation (AI Security Institute)

Advanced AI models like GPT-5.5 are now demonstrating sophisticated multi-step cyberattack simulation capabilities, signaling that AI has become a critical tool for both offensive and defensive cybersecurity operations. However, government restrictions on access to these models—citing national security and compute capacity concerns—create a complex landscape where IT leaders must navigate between AI capabilities and regulatory constraints. This represents a fundamental shift in how governments approach frontier AI technology deployment, with implications for supply chain risk management, competitive advantage, and organizational readiness for AI-driven security threats.