I wouldn't use GPTs for creating
content, even though (and because) it is excellent at producing the kind of oleaginous marketing text that we were all sick of before it could be automated.
In terms of what I
would use it for, it starts with a caveat: LLMs with chat interfaces need their hands held
at all times if they are to give worthwhile output. They cannot, in the example that
@Ian Doncaster gave, separate what is known to be true about the BGS (after principled testing) from a half correct (if you squint) statement some random player wrote on a wiki somewhere. OpenAI have neither the ability nor motivation to fact check. Essentially,
everything output by ChatGPT is a hallucination - it has no knowledge of itself and no (explicit) knowledge of the outside world. It just so happens that some of the things it outputs are interpreted as being true because there is a preponderance of language to that effect in its training data, so the output corresponds, more or less, with the reality.
With that said, I can certainly see uses for it. It is
very good at paraphrasing and summarising information that it has been told to use. If GPT4o could integrated into, say, Inara, it could summarise the faction influence levels and states through speech and output the data in common formats for use elsewhere. However, Inara is a complex website with multiple integrations itself, so this would be, I suspect, a pretty big project. I haven't used Copilot very much, so I'm not sure if that could provide some (or all) of that kind of functionality. It is integrated into Bing search.
Something much more manageable would be to integrate GPT4o into Google Docs and tell it to only use the player-managed data in specific documents. Provided it can be prompted appropriately, given enough context (so it 'knows' how it should interpret data) and has accurate data to work with, it could give actions advice to players in a spoken or written format. Very often, in my experience, groups end up with one or two people who know the BGS well, and those people end up needing very broad shoulders in order to organise and manage BGS actions. A bot could be very helpful in that situation.
There are also Discord integrations for ChatGPT, which could prove useful as well.