I have been a user of ChatGPT4 from the very beginning and like others I have found it extremely useful in multiple subjects. It is particularly good on topics that there is a lot of prior art and it can sometimes provide surprising insights.

OTOH I have found that it not as good on topics that there is not a lot of prior art in the public domain or in topics like advanced mathematics which often have a formal and unintuitive presentation.

For example, I have acquired recently an interest in probabilistic logic and when discussing results with it, I have found that although it has knowledge of the subject, it cannot really apply that knowledge in a creative way. It will often make logical mistakes and when these are pointed out, it will first apologize and then continue to make the same mistake.

So as far as I am concerned I am unconvinced that it can reason yet.