I've tried using ChatGPT to translate Latin texts from the Renaissance. I know enough Latin (intermediate, but can figure it out with a dictionary) to check it, and it was very, very impressive. What blew me away was not just the fluency of the translation but the fact that I could drop in highly imperfect OCR'd text from Google Books, and it didn't have any trouble making sense of garbled passages. This ability makes it a really distinct advance on Google Translate and the like, at least for my purposes.

Also, another underrated feature: I asked it to summarize each page in a single sentence, while also picking out the passages most relevant to my research question. It did a great job.