[nerpderp82]

Everything out of an LLM is a confabulation, but you can constrain the output space of that confab by restraining it with proper prompting. You could ask it to put confidence intervals for each one of its sentences (ask it in the prompt), but those will be confabulated as well, but will give it some self doubt, as for now, it hasn't been programmed with any. Probably costs a lot more in power to run it with doubt. :)

Edit, I played around with this. It looks like GPT4 has a guard against asking for this. It flat out refused with the two prompts I gave it to include confidence intervals. Maybe that is a good thing.