[nicwolff]

It's a bit more than zero, because I have substantial tooling around Claude Code – subagents, skills, containerization, &c – that I'd have to (have Opus...) reimplement.

[car]

You can point CC at other models, e.g. via OpenRouter. It only requires three env variables to be set.

[bonoboTP]

Exactly. If Codex is really as good, it should have no problem porting any settings or config from the Claude setup. (and I do believe it wouldn't have much of a problem)