Not to get philosophical but to answer you we need to answer what is sentient.

Is it just observable behavior? If so then wouldn’t Kermit the frog be sentient?

Or does sentience require something more, maybe qualia or some othet subjective.

If your son says “dad i got to go potty” is that him just using a llm to learn those words equals going to tge bathroom? Or is he doing something more?