GPT-5.5 Matches Claude Mythos On 32-Step Cyberattack, UK AISI Reports
OpenAI's newest model GPT-5.5 can autonomously chain a 32-step corporate network breach and crack a 12-hour reverse-engineering puzzle in roughly 10 minutes. AISI Cyber Evaluation Results The U.K. AI Security Institute, a research body within Britain's Department of Science, Innovation and Technolog