Clarification on AI Studio Billing: "Pay as you go" plan vs Google One AI Premium subscription

Google AI Studio
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Hi everyone,

I’m starting to develop an Android app and planning to use Google AI Studio for prototyping and generating code.

I currently have an active Google One AI Premium subscription, but when I look at my billing/plan status inside AI Studio, it says “Pay as you go”. I can’t see any upfront costs or a clear breakdown of how this connects.

I would appreciate some clarification on the following:

  1. Does my Google One AI Premium subscription cover or integrate in any way with AI Studio usage, or are they completely separate?
  2. If I only use the AI Studio web interface (aistudio.google.com) to write prompts and generate app code, will I be charged under the “Pay as you go” plan, or is the web interface testing completely free?
  3. At what point does the “Pay as you go” billing actually trigger when developing or testing locally?

Thanks in advance for your help!