OpenAI Rolls Out GPT-5.5Cyber to Vetted Defenders

OpenAI has begun rolling out GPT-5.5Cyber, a specialized artificial intelligence model designed for cybersecurity, to a select group of vetted cyber defenders, with access expected within days.

CEO Sam Altman announced the limited deployment on X, stating, "We're starting rollout of GPT-5.5Cyber, a frontier cybersecurity model, to critical cyber defenders in the next few days. We will work with the entire ecosystem and the government to figure out trusted access for cyber. We want to rapidly help secure companies and infrastructure."

The model will be distributed through OpenAI's Trusted Access for Cyber program, which provides tiered access to verified security professionals, critical infrastructure operators, government agencies, security vendors, cloud platforms, and financial institutions. This approach builds on the earlier GPT-5.4Cyber, released in mid-April with 10 million dollars in API grants for vetted organizations.

The rollout forms part of a broader cybersecurity action plan outlined by OpenAI, structured around five pillars. The first focuses on democratizing defensive tools to ensure smaller entities like hospitals and utilities receive advanced protections. The...