I dunno, feels like the models have different weak/strong points, sometimes I can sit with Claude Code for an hour with some issue, try it with Codex and have it solved in five minutes, and also the opposite happens. I tend to use Codex mostly when I care more about correctness and not missing anything, Claude when it's more important I do it fast and I know exactly what it needs to do, Codex seems to require less hand-holding. Of course, just anecdotal.

GPT models definitely seem stronger when they "get it" and in the types of problems they "get", while claude seems more holistic but not "as smart" as some of the spikes GPT can get.