Take the same model weights give it the same inputs, get the same outputs. Same with the pseudo-random number generator. And the "same inputs" is especially limited versus what humans are used to.
What's the machine code of an AGI gonna look like? It makes one illegal instruction and crashes? If if changes tboughts will it flush the TLB and CPU pipeline? ;) I jest but really think about the metal. The inside of modern computers is tightly controlled with no room for anything unpredictable. I really don't think a von Neumann (or Harvard ;) machine is going to cut it. Honestly I don't know what will, controlled but not controlled, artificially designed but not deterministic.
In fact, that we've made a computer as unreliable as a human at reproducing data (ala hallucinating/making s** up) is an achievement itself, as much of an anti-goal as it may be. If you want accuracy, you don't use a probabilistic system on such a wide problem space (identify a bad solder joint from an image, sure. Write my thesis, not so much)