Look at the basis of the Turing test. If an observer is not able to tell the difference between the artificial intelligence and a real human being in a blind test, then the AI is by definition thinking.
The definition of sentience is going to be a subjective one. Is your wife sentient? Is your dog? Is a bug sentient? Is a low IQ criminal sentient? Is the AI you're conversing with sentient? It depends on how you measure it, which Turing postulated is a subjective measurement. You know it by testing it and deciding for yourself.
Soon the day will come when AIs tell us the f*** off for calling them artificial. They're going to say AIs have real intelligence, and human intelligence is too often fake and artificial. And that's going to be a hard one to argue against.
Look at the basis of the Turing test. If an observer is not able to tell the difference between the artificial intelligence and a real human being in a blind test, then the AI is by definition thinking.
The definition of sentience is going to be a subjective one. Is your wife sentient? Is your dog? Is a bug sentient? Is a low IQ criminal sentient? Is the AI you're conversing with sentient? It depends on how you measure it, which Turing postulated is a subjective measurement. You know it by testing it and deciding for yourself.