Bigger numbers are supposed to mean better. 3.5, 4, 4.5. Going from 4 to 4.5 to 4.1 seems weird to most people. If it's better, it should of been GPT-4.6 or 5.0 or something else, not a downgraded number.

OpenAI has decided to troll via crappy naming conventions as a sort of in joke. Sam Altman tweets about it pretty often