What escapes a lot of people is that ChatGPT was a battle won in the UI/UX real first and foremost. GPT3 was old news, but throw a new paradigm and interface on it and here we are.
Incorrect. ChatGPT is markedly more capable than GPT3 because of its improved model (instructgpt and supervised fine tuning). Anyone who has played with both can attest to that.
It's not merely UI changes.