They probably didn't pay for access to a certain version of a model, they paid for access to the best available model, whatever that is at any given moment. I'm

They probably didn't pay for access to a certain version of a model, they paid for access to the best available model, whatever that is at any given moment. I'm reasonably sure that is even what OpenAI implied (or outright said) their subscription would get them. Now, it's the same amount of money for access to the second best model, which would feel like a regression.