OpenAI just rolled out the full version of GPT 5.5 Cyber, a specialized AI built for cybersecurity. And they're pretty excited about one thing: it beat Anthropic’s Claude Mythos 5 on CyberGym, which is a tough benchmark that tests whether AI can spot known software vulnerabilities. This launch follows a preview version from a few months ago and really shows OpenAI is putting more energy into cybersecurity as a major use case for advanced AI.This new model doesn’t just find basic vulnerabilities. OpenAI says GPT 5.