I hate to say I told you so but the cost per token is going up. A good example of this is Gemini Flash 3.5 that just came out today. It’s 3x more expensive than 3 and 30x more expensive than 1.5.
But remember you can control your own costs with proper prompt formation. It is easy to waste tokens if you don’t know what you are doing.
I have a guide on how to reduce your token costs here.