alt Hacker NewsEvery plan Opus creates in Planning mode gets run through ChatGPT 5.2. It catches at least 3 or 4 serious issues that Claude didn’t think of. It typically takes 2 or 3 back and fourths for Claude to ultimately get it right.
I’m in Claude Code so often (x20 Max) and I’m so comfortable with my environment setup with hooks (for guardrails and context) that I haven’t given Codex a serious shot yet.
The same thing can be said about Opus running through Opus.
It's often not that a different model is better (well, it still has to be a good model). It's that the different chat has a different objective - and will identify different things.