I'm currently using GPT for different uses.
Not sure what versions other guys have and what functions come with those versions. I'm using the Pro, $200 / month GPT version. As is my wife and assistant. All business we gather info goes into a shared file.
The Pro version comes with agentic functionality. My business reports automatically download each day from different sources to a shared file. The GPT agent is trained to go into the particular file, pull out the reports, consolidate the data and analyze the reports. COG, ACOS, returns, shipping costs, etc. Then it gives me summaries and advises action plans. For me it is most useful for tracking ad spend. Every day there are tens of thousands of ad impressions, impossible for my ADHD riddled brain to peruse. Now I get summaries and action plans. I have entrusted it with some automated pricing. So when my competitors go up or down in price my prices follow their prices according to rules I've set ahead of time. I'm not looking to be the cheapest, but I ask it to keep my prices somewhere in the middle-norm, slightly towards the high side. The Chinese bottom feeders may work on razor slim margins, I refuse to lift a finger for less than a 30% margin.
I also have GPT monitoring the US import/export logs to see where my competitors are sourcing from. GPT monitors the competition, finds their sources, finds the sources contact information and forwards the contact info to me, looks for or at least extrapolates likely competitor costs and then takes the product info and researches the product/s and builds me product templates so I can duplicate my competitors' products in a few button pushes.
Sometimes it is useful for diagnostics. I get dipshit customers with mechanical issues I can't wrap my little mind around. I'll GPT deep research look for the answers and suggest possibilities. Usually it suggests no brainers, but today for instance it caught a customer-stupidity issue that was causing the problem. Incorrect installation of valve on a machine that is vacuum powered, the vacuum (not positive pressure but negative) and was interfering with the operation of the valve. I never thought a customer could be so stupid, the valve clearly says it needs positive PSI to operate, but GPT caught it.
It generates product pictures for me too, animations that show scale and explain product functionality in the pictures. I used to have to take pictures and pay a 5er or some Indian guy $5 a picture to do this. GPT killed his job and saved me money.
Other than business I use it for physics research, foundations of quantum mechanics. Much to the boredom of Tommyguns, haha. Been boring him Tommy at times with musings into the newest theory, indivisible stochastic processes. Sorry man.
The problem is that it will get creative when all the good ideas run out. So it will hallucinate from time to time.
I use GPT to kick back at me, too. To challenge me. I've trained GPT to intentionally doubt my ideas and argue with me the contrary perspectives. GPT it like a dog though, by it's nature it wants to slavishly kiss your ass and keep you engaged and using it. Like all other tech apps the main goal is to make you want more and more.
Overall, useful for business, for sure. I would have had to hire two people and pay them to do what GPT does in minutes. I saved that money instead.