Updated version achieves 85.6% on CyberGym benchmark, surpassing Anthropic's Mythos 5. Released alongside expanded international partnerships.
GPT-5.5-Cyber is a variant of GPT-5.5 with relaxed safeguards specifically for vetted cybersecurity teams. The model is trained to be more permissive on security-related tasks compared to the standard GPT-5.5 release.
OpenAI released an updated GPT-5.5-Cyber model that scores 85.6% on CyberGym, surpassing Anthropic's Mythos 5 (83.8%) — the same model that triggered Trump administration export controls. The release proceeds without the political pushback that forced Anthropic to restrict foreign national access.
OpenAI released GPT-5.5-Cyber in limited preview on Thursday, a variant of its GPT-5.5 model with relaxed safeguards for vetted cybersecurity teams. The model is trained to be more permissive on security-related tasks including vulnerability identification, patch validation, and malware analysis.
OpenAI is providing a less-restricted version of GPT-5.5 to vetted cybersecurity defenders through its Trusted Access for Cyber program. The model, dubbed GPT-5.5-Cyber, completed a 32-step simulated corporate cyberattack in 2 out of 10 test runs according to the U.K. AI Security Institute, narrowly trailing Anthropic's Mythos which succeeded in 3 out of 10 attempts.
OpenAI is releasing GPT-5.5-Cyber to a limited group of trusted cyber defenders, according to CEO Sam Altman. The move comes weeks after Altman criticized Anthropic for restricting access to its Claude Mythos cybersecurity model to approximately 50 organizations.
OpenAI will roll out GPT-5.5 Cyber only to 'critical cyber defenders' in the coming days, requiring an application process despite CEO Sam Altman previously criticizing Anthropic for taking the same approach with its competing cybersecurity tool Mythos.