Codex Code Review makes pull requests first-class

Codex is evolving from a coding agent into a complete software-delivery collaborator, making review a first-class workflow rather than an afterthought.

• –Developers can inspect changes, investigate findings, and ask Codex follow-up questions in one review context.
• –GitLab support broadens Codex beyond GitHub, though the preview’s limitations and rollout mean parity is not yet complete.
• –The strongest advantage is the closed loop: review feedback can lead directly to scoped fixes, followed by inspection of the resulting diff and checks.
• –Human validation remains essential because OpenAI explicitly advises reviewing generated findings before relying on them. ([OpenAI Help Center](https://help-lb.openai.com/en/articles/20001552-review-pull-requests-with-codex), [OpenAI](https://openai.com/index/introducing-upgrades-to-codex/))