I lack a bit of context. Can you point me to a place that explains what you use?

I haven't really shared what I use, I'm still deciding if that's something I want to do.

To get an idea of what I'm talking about, you could install https://github.com/obra/superpowers/ into both Codex and Claude Code -- You'll find that the behavior is remarkably similar if you A/B compare them on the same problems. CC occasionally misses things that Codex gets and vice versa.

Overall the output structure and final code is remarkably similar... Which is pretty different than if you just run them with their default system prompts. I'd throw codex out the window with its default outputs.