model releaseOpenAI
OpenAI Opens GPT-5.5-Cyber to Vetted Defenders After Model Matches Anthropic's Mythos in Security Testing
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.
2 min read