I'm not a cost expert for all the models. My usage is low enough not worry about it. However, I noticed today how expensive GPT 5.5 is. I realized GPT 5.6 was already cheaper before the price reduction and it's the newest model. I figured the newest shiny model should be pricier.

Are the older models supposed to get cheaper over time or do they stay expensive to encourage people to stop using the old stuff?