This Tuesday morning, OpenAI has launched its new GPT 5.5 Cyber model, designed specifically for cybersecurity work, and multiple sources including Digit.in and Decrypt confirm it outperforms Anthropic's Mythos 5 on key benchmarks. The updated GPT 5.5 Cyber scored 85.6% on CyberGym, a benchmark for reproducing software vulnerabilities, beating Mythos 5's 83.8%. OpenAI states this model is "more permissive" and "more capable for advanced, authorized cybersecurity work," intended for verified defe