UK Security Institute Evaluates GPT-5.5 Cybersecurity Model

According to the UK AI Security Institute, OpenAI's GPT-5.5 is the second AI model capable of autonomously resolving complete network attack simulations. The findings indicate that it performs nearly on par with Anthropic's Claude Mythos, which remains limited in availability. GPT-5.5 is integrated within ChatGPT and available through API access, marking a significant step for AI applications in security. The assessment of these models suggests improved capabilities in cybersecurity, highlighting the efficiency of AI solutions in threat detection and response. However, it does not directly influence national technology strategies or dependence on foreign models, as both platforms remain commercial products without specific government involvement or funding commitments.