I can't speak for GPT, but I usually let copilot take a first pass at things, then when I start to tweak them to fix Copilot's mistakes, the AI peer-codes it out with me pretty quick.

I've actually managed to get copilot to offer a valid solution to a problem that was cleaner than my own (though it took a few tries).

Dev AI's work and save time as long as you know what you're doing and aren't trying to lean on the AI to do all the coding.