Codex CLI to automatically fix CI failures, use the following YAML shows a GitHub action that auto triggers when CI fails, installs Codex, uses codex exec and then makes a PR on the failing branch with the fix. Replace “CI” with the name of the workflow you want to monitor.

GPT-5-Codex Prompting Guide, is a new version of GPT‑5 further optimized for agentic and interactive coding tasks.