Bug with model selection. not sure if this is a bug or a feature with premium

so i cant change the model from gpt 3.5 to 4, the model selector box has just disappeared. I don’t even know if I’m using gpt 4 at the moment either. would like to but it just doesn’t say that I’m using either. I have premium btw.

anyone else had this problem? have they allowed infinite tokens for premium users for gpt-4?