I used to think this but now I'm fairly convinced that it "knows" somewhat less than someone who was locked in a tiny dark room with no input except the ability to read a lot of text from the internet would know if that was their whole life. I don't believe it has a sense of self or consciousness, just that it possesses whatever knowledge is embedded in written text. Maybe a better analogy would be if you could cut out someone's language centre and put that into a jar hooked up to text input and output. It's not a whole mind but it sure feels like it's a piece of a mind that can do mind-like stuff.