In my experience gpt5-codex (medium) and codex-cli is notably better than Sonnet 4.5 and claude-code. (note: never tried Opus)

It is slower, but the results are much more often correct and it doesn't rush into half-baked solutions/dumb approaches as eagerly.

I'd much rather wait 5 minutes than have to clean up manually or try to coax a model into doing things differently.

I also wouldn't be surprised if the slowness was partially due to OpenAI being quite resource constrained. They are repeatedly complaining about not having sufficient compute.

Bigger picture: I think all the AI coding environments are incredibly immature. There are many improvements to be unlocked.