If you use Claude Code, it will take you half a day to learn to use Codex, and like 30 minutes to start being productive in it. The switching cost is almost zero. Just go test out GPT 5.3, there is no reason not to
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.
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)
