OpenAI releases GPT-5.5-Cyber, a specialized AI model for finding and patching software flaws, alongside an updated security plugin and partnerships with over 25 security firms and several governments.

What happened

OpenAI launched the full version of GPT-5.5-Cyber, a model designed to find and patch software vulnerabilities, along with an updated Codex Security plugin that automates the full workflow from flaw discovery to patch generation. The company also established the Daybreak Cyber Partner Program with security firms including Cisco, CrowdStrike, Cloudflare, and Palo Alto Networks, as well as partnerships with governments including Australia, Canada, France, Germany, Japan, South Korea, and the UK.

What to watch

GPT-5.5-Cyber access is deliberately restricted to verified defenders only and is tied to verification, monitoring, and guardrails. OpenAI recommends most users pair GPT-5.5 with Trusted Access for Cyber and Codex Security instead. An open-source patching initiative called Patch the Planet, launched with Trail of Bits, HackerOne, and Calif, has already signed on more than 30 open-source projects including cURL, Go, and Python.