It's not in Basic, Standard or Premium.
It's in a new tier called "Google AI Pro" which I think is worth inclusion in your catalogue of product confusion.
Oh wait, there's even more tiers that for some reason can't be paid for annually. Weird... why not? "Google AI Ultra" and some others just called Premium again but now include AI. 9 tiers, 5 called Premium, 2 with AI in the name but 6 that include Gemini. What a mess.