I am a big fan, as on my topics of interest it does much better than o3, and that is saying something. It is also lightning fast, even for complex queries of economics, history, and ideas.
One of the most impressive features is its uncanny sense of what you might want to ask next. And it has a good sense of when to give you an (sometimes interactive!) chart or diagram.
I have had early access, and love to just keep on asking it, asking it, asking it questions. Today I was asking about Irish coinage disputes from 1724 (Swift) and now about different kinds of Buddhism and their historical roots. It was very accurate on cuisine in northern Ghana.
It is the best learning tool I have. Furthermore, it feels fun.
Here is a review from Ethan Mollick.
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