You can install the Gemini CLI (https://github.com/google-gemini/gemini-cli) but assign a "paid" API key to it (unless you pay for Gemini Ultra).

So where do I get a API key? Where do I sign up for Ultra?

For API key, go to https://aistudio.google.com/ and there's a link in the bottom left.

But this is if you want to pay per token. Otherwise you should just be able to use your Gemini Pro subscription (it doesn't need Ultra). Subscriptions are at https://gemini.google/subscriptions/

Okay, thanks. Unfortunately, when I try to sign up to a plan on https://gemini.google/subscriptions/, I am redirected to the Workspace Admin (as I'm a business user and One is only available to personal accounts), where I am offered Google Ultra AI for Business for €216 per month, but I can only upgrade the entire Workspace or nothing!

Is that correct? I can't even upgrade a Group separately?