This was a really good article. I typically code with Sonnet or Opus, but I'm going to start using Codex to review local changes before I do a PR. It does a great job at identifying issues and then patching them. I just feel weird having Anthropic review it's own code so this will be my workflow for now. For complex features I also use Opus to cook up an implementation plan ahead of time that a lot of the time I have Sonnet implement. I may also have Codex start devil's advocating the plan before I start too, just to catch issues earlier.