I'm currently using it for formatting technical texts and it's amazing. It doesn't generate them properly. But if I give it the bulk of the info it makes it pretty af.
Also just talking and asking for advice in the most random kinds of issues. It gives seriously good advice. But it makes me worry about whether I'm volunteering my personal problems and innermost thoughts to a company that will misuse that.
I won't touch the proprietary junk. Big tech "free" usually means street corner data whore. I have a dozen FOSS models running offline on my computer though. I also have text to image, text to speech, am working on speech to text, and probably my ironman suit after that.
These things can't be trusted though. It is just a next word statistical prediction system combined with a categorization system. There are ways to make an LLM trustworthy, but it involves offline databases and prompting for direct citations, these are different from Chat prompt structures.