OpenAI’s new security model is for ‘critical cyber defenders’ only

Like Anthropic’s Mythos, GPT-5.5-Cyber will first be released to ‘trusted’ entities. Like Anthropic’s Mythos, GPT-5.5-Cyber will first be released to ‘trusted’ entities. OpenAI is preparing to launch a new frontier cybersecurity model, GPT-5.5-Cyber. CEO Sam Altman said the model will not be available to the general public, but will be first rolled out to a select group of trusted “cyber defenders” in order for institutions to shore up their cyberdefenses. The limited rollout will take place “in the next few days,”Altman said on X. “We will work with the entire ecosystem and the government to figure out trusted access for Cyber.” It’s not clear who will get access to the model first, thoughprevious“trusted access”schemesinvolved vetted professionals and institutions. Details of the model and its capabilities are also unclear; OpenAI has not released any technical details or specifications. The name indicates it is a specialized version of therecently released GPT-5.5, which it called its “smartest and most intuitive to use model yet.” The staggered rollout is part of a growing trend in the AI industry of companies branding their top models too dangerous for public release due to their potential for misuse. OpenAI has staggered the release of previous cybersecurity-focused models, in addition to its new purpose-builtlife sciences model GPT-Rosalind, which is intended to support biology research and drug discovery. This month, Anthropic followed a similar playbook with Claude Mythos, though with much greater fanfare, and itbungled the model’s secure releasein embarrassing ways. The White House has taken a keen interest in Mythos’ rollout, despite lingering tensions with Anthropic after its fight with the Pentagon. It has recently opposed plans to expand access to Mythos further,accordingto theWall Street Journal. The report’s unnamed White House officials cite both cybersecurity concerns associated with more people having access to Mythos and worries that increased demand would hamper the government’s ability to utilize the system as reasons for the pushback. A free daily digest of the news that matters most. This is the title for the native ad