Yes, my understanding is also there will be a 1.5 Ultra.

It's however nowhere explicitly said that I could find. The Technical Report PDF also avoids even hinting at it.

Advanced is a price/service tier for the end-user frontend. At the moment it gets you 1.0 Ultra access vs. 1.0 Pro for the free version. Similar to how ChatGPT Plus gives you 4 instead of 3.5.

I agree this part is messy. Does everyone who had Pro already get 1.5 Pro? If 1.5 Pro is better than 1.0 Ultra, why pay for Advanced? Is 1.5 Pro behind the Advanced paywall? etc.

Ok, so from what I've gathered then from all of the comments so far, primary confusion is that both Chat service and llm models are named the same.

There are three models: nano/pro/ultra and all are at v1.0

There are two tiers of chat service: basic and pro

There is AIStudio from google through which you can interact with / use directly gemini llms.

Chat service Gemini basic (free) uses Gemini Pro 1.0 llm.

Chat service Gemini advanced uses Gemini Ultra 1.0 llm.

What was shown is ~~Ultra~~ Pro 1.5 LLM which is / will be available to select few for preview to be used via AIStudio.

That leaves a question, what's nano for, and is it only used via AIStudio/API?

Jesus, Google..

No, what they showed is Pro 1.5. Only via API and on a waitlist.

How this relates to the end-user chat service/price tiers is still unknown.

The best scenario would be that they just move Gemini free and Advanced tiers to Pro 1.5 and Ultra 1.5, I guess.

Yes, you are right. I meant Pro. Let's see then.

Nano is the on-device (Pixel phone) model.