It was with gpt3. Already tried a couple of previous convos with gpt4 and noticed the difference.

Will have to try the gravity one now.

Thanks for the recommendation!

Can confirm. This week a physicist friend came by to give it a try. He asked some questions related to his domain. I was fully expecting GPT to bullshit its way through it, from experience with GPT 3. But to my surprise, and to his, it got quite decent answers.

Are you referring to ChatGPT Plus?

ChatGPT Plus is the platform, GPT4 is the model.

(ChatGPT+ allows you to specify which model you want to use.)