Several recent studies have highlighted just how difficult it is to determine whether text was generated by a human or a chatbot. Research participants recruited for a 2021 online study, for example .

Unusual words or punctuation may serve as ‘tells’ that something has been written by a chatbot. But even with that knowledge, most people struggle to discern human writing from AI-generated text.

It assigns a score to each option on the list, which quantifies how likely the word is to come next, based on the vast amount of human-written text it has analyzed.