OpenAI launches Daybreak cybersecurity platform for critical defenders

- OpenAI launched Daybreak, a new cybersecurity platform built on GPT-5.5 and Codex Security, according to an AI news roundup published May 15, 2026.
- The platform is designed to help organizations identify threats, generate patches, and verify remediation across code and systems, with access initially limited to “critical cyber defenders.”
- The move puts OpenAI into direct competition with Anthropic’s Mythos and reflects growing concern that AI-assisted hacking is shifting from theory to practice.
- OpenAI’s launch comes as Google threat researchers said criminal hackers have already used AI to exploit a zero-day vulnerability, underscoring why enterprise and government cybersecurity teams are likely to be early users.
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