I recently had to check code from some of my students at the university as I suspected plagiarism. I discovered JPlag which works like a charm and generates nice reports
In addition, do things like stack overflow and using LLM-generated code count as cheating? Because that is horrible in and of itself, though a separate concern.
*edited mobile typos
In case of a false positive from a faulty detector this is extraordinary evidence.
From my experience using ChatGPT, It usually remove most of my already written comments when I ask questions about code I wrote myself. It usually give you outline comments. So unless you are supporter of the self documented code idea, I don't think ChatGPT over comments.
That happens and also the model can't decide if it wants the comment on the line before the code or if everything should be appended to the line itself so when I see both styles within a single project it's another signal. People generally have a style that they stick with.
as an example just go ask it to write any sufficiently average function. use different names and phrases for what the function should do; you'll generally get a different flavor of answer each time, even if the functions all output the same thing.
sometimes the prompt even forces the thing to output the most naive implementation possible due to the ordering or perceived priority of things within the requesting prompt.
it's fun to use as a tool to nudge it into what you want once you get the hang of the preconceptions it falls into.