https://www.cnet.com/news/musk-backed-ai-group-our-text-generator-is-so-good-its-scary/

That is, give it a sentence as a prompt, and it'll give you a writing sample that's pretty convincing. Trained on a data set of 8 million web pages, GPT-2 can even adapt to the style and the content of the text you feed it.

OpenAI offered a number of examples, including this one: