The first level of consistency is: consistent with the world around us. People have two legs and two arms. You eat off plates. GPT is good at this. But if you w

The first level of consistency is: consistent with the world around us. People have two legs and two arms. You eat off plates. GPT is good at this. But if you want to build Ant World it'll be hard. The second level of consistency is: consistent with a stereotype. So "standard fantasy world" is going to be consistent with fantasy tropes. (Mostly, except with a strong tourist industry and the occasional café; the modern world leaks in.) The third level of consistency is: consistent with what you explicitly state about the world. That's the city backstory. If you want magic to come from the sun and you can catch magic in little sun basins and then use that to power your dishwasher, then you can state that... but it may have a hard time remembering that, and a harder time extrapolating all the effects. But GPT won't entirely forget it, and may even come up with some interesting ideas. The real challenge though is: consistency with the author's as-yet-unfulfilled desires. That's where an interactive tool that allows co-creation with the AI might offer something, but it WILL be a struggle because the author must develop, articulate, refine, and reform their ideas, and the AI may help or resist, but often will simply make it clear the gaps that exist between desire and vision.