It would have to be a more obscure, archaic language that's barely even spoken of on the internet.

I asked ChatGPT once about their proficiency in languages, both human and computer. They responded that they are most proficient in English and Python, largely because they are the most written/documented languages on the internet.

I forgot where it ranked other languages...I think it said it was pretty decent in Mandarin and most latin-derived tongues. I uninstalled the app so not about to go through my chats with it and try to find it.

However, ChatGPT is known to write in ways to appease the user, and I've almost exclusively spoken to it in English and asked it python questions.

I do wonder if somebody who primarily used ChatGPT in, say, French, and account history had a lot of C questions, if it would answer differently.