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AFAIK top chess players can recognize they're playing against an engine relatively easily. The engines are so far ahead that they often play moves which are "surprising" even for Carlsen, i.e. lines which may seem suboptimal or just unknown - this would normally indicate a weak player, but engines then crush even Carlsen with ease.

But these engines are optimized to win, not to mimic humans, so it's a different story from ChatGPT.

It’s typically not the moves alone that indicate engine use to the other player. The timing is also incredibly important. If it takes you 5 seconds to recapture a piece, where that’s the only viable move, but it also takes you 5 seconds to come up with an insane brilliancy that’s the result of a deeply calculated line, cheating is a likely explanation.

Not really comparable IMO. Stockfish is not built to resemble human play and the move times give away a ton of information. A better comparison would be if a top player could tell when they are looking at games played by Maia.

https://maiachess.com/