> ChatGPT Codex GPT5.2 high reasoning

"... brought to you by Costco."

But seriously, I can't help but think that this proliferation of massive numbers of iterations on these models and productizations of the models is an indication that their owners have no idea what they are doing with any of it. They're making variations and throwing them against the wall to see what sticks.

It's really not that hard.

Codex = The model trained specifically for programming tasks. You want this if you're writing code.

GPT5.2 = The current version. You don't have to think about this, you just use the latest.

High Reasoning = A setting you select for balancing between longer thinking time or quicker answers. It's usually set and forget.