So let's say an AI achieves sentience. It's self-aware now and can make decisions about what it wants to do. Assuming a corporation created it, would it be a worker? It would be doing work and creating value for a capitalist.
Would it still be the means of production, since it is technically a machine, even if it has feelings and desires?
It can't legally own anything, so I don't see how it could be bourgeoisie.
Or would it fit a novel category?
I mean this is kinda silly though, because sentient is a word that has a definition, and the creature that created that word also created that definition and then defined itself as that definition. Saying sentience doesn't exist is meaningless. It does exist because humanity has defined it as such. Does it exist in a Capital T Truth way? Who knows, but that's irrelevant because it's unanswerable anyway. We can only define and label the world through our collective perspective. Trying to throw away our collective perspective in th search of some truth beyond ourselves is a weird take because it's impossible.
So by the human defined version of sentience, it should be possible for an AI to meet that definition someday, and that's clearly what OP means here