OpenAI Expands Daybreak With GPT-5.5-Cyber to Help Defenders Patch Security Flaws

OpenAI is releasing GPT‑5.5‑Cyber and updates to its Codex Security tooling to help trusted defenders find, validate, and patch vulnerabilities at scale, and launched the Patch the Planet initiative with Trail of Bits to secure open-source projects. The report highlights Daybreak-discovered issues including kernel info leaks and local privilege escalations in Linux/FreeBSD/OpenBSD, multiple dnsmasq CVEs, browser engine and WebAssembly vulnerabilities, and an HTTP/2 DoS technique, while warning that advanced AI also accelerates attackers' ability to find and weaponize flaws, compressing the window for defensive response.