Hard to say, at the very least it will be indistinguishable from a sentient being at some point, even though it fakes it.
Discussion
Isn't that crazy?
It is a bit scary, in a few years you could be talking to someone on the internet without having a fucking clue if they're an actual person.
Though I guess a good test will be to get them to say something horribly un-PC and see if they can.
Our ability to be vile will be what sets us apart from the machine.