OpenAI makes frontier model available to critical cyber defenders
Summary
OpenAI is providing its GPT-5.5-Cyber model to the federal government and critical cyber defenders, accompanied by a new Cybersecurity Action Plan for national defense.
Key quotes
We believe the better path is responsible, trusted access for defenders so they can move faster than adversaries can adapt.
The release of GPT-5.5-Cyber occurs alongside a similar move by Anthropic with its Mythos AI. It follows a new Cybersecurity Action Plan aimed at securing critical infrastructure.