The UK’s AI Security Institute evaluated OpenAI’s GPT-5.5 and found that its capability to identify security vulnerabilities is comparable to Anthropic’s Claude Mythos model, with GPT-5.5 being generally available. This evaluation highlights the advancing role of large language models in cybersecurity, although discussions note limitations in reasoning and the potential plateau in detecting new attack classes without human input.
OpenAI’s GPT-5.5 Is as Good as Mythos at Finding Security Vulnerabilities – Schneier on Security
