I went back and forth between the two for months, often having both in various proportions. But I had enough reliability issues with Anthropic back in March timeframe that I just threw in the towel. I find GPT "boring" to work with but it's a steady hand and there's really nothing I throw at it that it can't do.

And yeah, I am supplementing with GLM 5.2 and have actually found it quite complimentary.

One of Codex's weaknesses is "excessive staging" -- basically it's quite cautious and pushes a very incremental approach. This is good for working in an established codebase (which most work is anyways). But for yeeting new projects, Claude always shone better for me (though it often left a mess of race conditions and unhandled negative cases that I had to clean up by hand or with codex)

GLM actually does pretty well in this regard, with the right prompting. It's more "creative" than GPT.