Analysis of the difficulty of text generated by the ChatGPT artificial intelligence, text from a lower-secondary physics textbook, and other sources in Czech language

Abstract ChatGPT (Generative Pre-trained Transformer) is a chatbot that was launched by Open AI as a prototype on November 30, 2022. ChatGPT has quickly gained attention for its detailed and well-formulated answers in many areas of knowledge. It can write computer programmes, poetry, business correspondence, or generate seemingly technical texts, depending on the verbal assignment. This article analyses and compares text in Czech language describing hydrostatic pressure produced by ChatGPT, from lower-secondary physics textbook and other sources. A text difficulty analysis was performed on the selected texts. The text-difficulty analysis by Nestler was chosen to assess the didactic properties. The results of the text-difficulty analysis and the selected partial coefficients are discussed.