When they get to you it's only inference. You have basic misunderstanding of what ANNs are.

They train on a billion "jobs". Which is not terribly efficient but oh man they do train.

Unique skills and jobs do exist. And LLMs can't gain additional knowledge "on the job" like humans can. They are generalists, that can only be steered by prompts, skills and context. Thats all I'm saying.

This fact is currently the most limiting factor for LLMs.