i find it very hard to classify chatGPT as narrow. Sure it was trained only on language, but that allows it to handle an extreme range of subjects, even if not being specifically trained to. Many of the things it can't do are not so much related to its internal capacities but to the lack of external sensors to connect it to the world ( no senses), it not able to see nor make images ( thogh its cousin dall-e already can) , and it is not allow to keep its memory between sessions which seriously cripples its ability to do on context learning.

So, while not as broad as a human intelligence yet, i wouldn't say it is narrow, it is an AGI but not yet at human level on most subjects.