I have a little knowledge on Machine Learning from MOOCs (mainly from around 5 years ago), but I want to get up to speed on state-of-the-art. I find ChatGPT3.5 useful as a starting point: to see what is out there, what models are currently used for various applications, etc. From there I usually read original papers. I was wondering if paying for chatGPT4.0 worth it for the same purpose?