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OpenAI's New Daybreak Platform Uses GPT-5.5 to Find Software...

The platform uses GPT-5.5 and Codex Security to help companies identify vulnerabilities, with OpenAI saying GPT-5.4-Cyber has fixed more than 3,000 issues.

  • OpenAI launched Daybreak, a cyber defense platform designed to help companies detect and patch software vulnerabilities before attackers exploit them.
  • The rollout follows Anthropic's announcement of Claude Mythos and Project Glasswing last month, addressing OpenAI's previous lack of a comparable security product.
  • Daybreak utilizes Codex Security to automate threat modeling and vulnerability detection, while specialized cyber models began rolling out last week for authorized defensive workflows.
  • Building on prior work, OpenAI's earlier cyber model has contributed to fixing more than 3,000 vulnerabilities, allowing defenders to integrate secure code review into development workflows.
  • OpenAI CEO Sam Altman said the company aims to work with "as many companies as possible" to secure software, coordinating with industry and government partners for future deployments.
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MacRumors broke the news in United States on Monday, May 11, 2026.
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