The environmental impact of running prompts through (most) of these models is massively over-stated.

(I say "most" because GPT-4.5 is 1000x the price of GPT-4o-mini, which implies to me that it burns a whole lot more energy.)

If you do a basic query to GPT-4o every ten seconds it uses a blistering... hundred watts or so. More for long inputs, less when you're not using it that rapidly.