It swapped at the Opus/Fable 5 and Sol developments.

Opus 5 uses such convoluted language that it takes me multiple seconds to parse it. I specifically have to instruct it to use some kind of sane language (Caveman the AE STD English hack or something) to make it understandable.

Before that it used to be GPT that used 500 words when 5 would do. The ChatGPT version still does, but Codex is a lot better now.