Taking on Mythos: OpenAI rolls out cyberdefence model Daybreak to speed up software security fixes

OpenAI has introduced Daybreak, a cybersecurity initiative focused on software vulnerability detection and remediation. The programme includes Codex Security, GPT-5.5-Cyber, Patch the Planet, and the Daybreak Cyber Partner Program. According to the company, the initiative is intended to support cybersecurity teams, open-source software maintainers and industry partners in addressing software security issues.