Codex Security Plugin

A plugin for OpenAI's Codex coding tool that scans your code for security vulnerabilities and helps fix them.

Install it inside Codex (desktop app or command line), point it at a project folder, and it runs a security scan of that code
It finds vulnerabilities, checks whether each one is real, and can apply fixes, aiming to stop issues before they reach production
Launched alongside the full release of GPT-5.5-Cyber, OpenAI's security-tuned model, which stays limited to vetted defenders
Part of OpenAI's Daybreak cybersecurity program