It does not matter if author is human or computer.

If there is a spelling bee, but student is secretly using spellcheck on the phone, they are cheating.

If there is a math speed competition, but student is using a calculator on the phone, they are cheating.

If it's a calculus exam, but student is using Wolfram Alpha (or TI-89) to calculate integrals and derivatives, it is cheating.

If it's a written exam but student is using ChatGPT to write the text, it is cheating as well. Not that different from previous cases.