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OpenAI Unveils GPT-5.4-Cyber Model for U.S. Agencies

4/22/2026

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Story summary
  • OpenAI briefed U.S. federal agencies and Five Eyes countries on its new defensive cybersecurity model GPT-5.4-Cyber, which was unveiled last week.
  • OpenAI demonstrated GPT-5.4-Cyber to about 50 cyber defense practitioners in Washington, D.C.
  • The company plans a limited rollout to vetted security vendors and organizations.
  • OpenAI is starting briefings with Five Eyes members to facilitate access to the model.
  • Cybersecurity is increasingly seen as a critical area for AI development.