GPT Answer: The doctor is the boy's mother
Real Answer: Boy = Son, Woman = Mother (and her son), Doctor = Father (he says...he is my son)
This is not in fact a riddle (though presented as one) and the answer given is not in any sense brilliant. This is a failure of the model on a very basic question, not a win.
It's non deterministic so might sometimes answer correctly and sometimes incorrectly. It will also accept corrections on any point, even when it is right, unlike a thinking being when they are sure on facts.
LLMs are very interesting and a huge milestone, but generative AI is the best label for them - they generate statistically likely text, which is convincing but often inaccurate and it has no real sense of correct or incorrect, needs more work and it's unclear if this approach will ever get to general AI. Interesting work though and I hope they keep trying.