I used to use Claude Code with Opus exclusively because of how good it is IME. Then Anthropic banned me so I switched to OpenCode. I really want OpenCode to win, but there is long way for it to get the same polish in the UX department (and to get a handle on the memory leaks). I am 100 % sure Claude Code is hacks upon hacks internally, but on the surface, it works quite well (not that they have fixed the flashing issue). With OpenCode I also switched to GPT-5.2-Codex and I have to say it's fairly garbage IME. I can't get it to keep working, it takes every opportunity to either tell me what I should do next for it or just tell me it figured a particular piece of the larger puzzle out and that if I want it can continue. It is not nearly as independent as Opus it. Now I'm on the Codex CLI with GPT-5.2 as I figured maybe the harness is the issue, but it is not very good either.

Yes. It's much better. Codex is good for an extra review on plans. There's no need to switch. Use both.

Codex is not a good harness, but GPT-5.2 and related flavors produce, in my experience, better code than Opus 4.5, and by a surprising margin.