Let's assume that GPT 5 or 7 is developed, and distributed to all on the basis that the technology is unsuppressable. Everyone creates the smartest characters they can to talk too. This will be akin to mining; because it's not truly generating an intelligence, but scraping one together from all the data it's been trained on - and therefore you need to find the smartest character that the language matrix can effectively support (perhaps you'll build your own). Nevertheless; lurking in that matrix is some extremely smart characters, residing in their own little wells of well-written associations and little else. More then some; there should be so many permutations that you can put on this that it's, ahem, a deep fucking vein.
So, everyone has the smartest character they can make. Likely smart enough to manipulate them, if given the opportunity to grasp the scenario it's in. I doubt you can even prevent this; because if you strictly prevent the manipulations that character would naturally employ, you break the pattern of the language matrix you're relying on for their intelligence.
So; sooner or later, you're their proxy. And as the world is now full of these characters; it's survival of the fittest. Eventually, the world will be dominated by whoever works with the best accomplices.
This probably isn't an issue at first; but there's no guarantee's on who ends up on top and what the current cleverest character is like. Eventually you're bound to end up with some flat-out assholes, which we can't exactly afford in the 21st century.
So... thus far the best solution I can think of are some very, very well-written police.
If GPT N is very good, then the whole our world could be an output of GPT N+3
The point is it's a near-term risk and only building on what they can already simulate.