It's a charade, it mimics intelligence. Let's take it ine step further... Suppose it mimics it so well that it becomes indistinguishable for any human from being intelligent. Then still it would not be intelligent, one could argue. But in that case you could also argue that no person is intelligent. The point being, intelligence cannot be defined. And, just maybe, that is the case because intelligence is not a reality, just something we made up.