Hello,
Thanks for the detailed reports and feedback. As a Google AI Pro or Ultra subscriber, you get higher per-model daily limits in AI Studio Playground (and Build) than on the Free tier, and limits reset daily rather than using rolling multi-hour windows (Google AI plans). Very heavy use of one model in a single day—such as long conversations or large text uploads, where each turn includes the chat history—can still reach that model’s daily limit while a shorter new chat continues until the remaining daily balance is used (Daily usage limits for models in AI Studio).
Regarding model availability, Gemini 4 Argon is included with Google AI Pro in both Playground and Build (Gemini 4 Carbon requires Google AI Ultra or a paid API key); for retired models such as Gemini 2.5 Pro, see Gemini deprecations.
- Switch to another available Gemini model in Playground (limits are tracked per model), or start a fresh chat with a shorter context.
- For sustained long-context or high-volume work without Playground limits, use your own paid Gemini API key via AI Studio Billing (eligible subscribers can also claim monthly Google Cloud credits on the Google Developer Program dashboard).
- If you are hitting limits after only a few short prompts in a brand-new chat or still seeing “Permission denied. Please check your account permissions and project settings” with no API key selected, please share your Google account email used for AI Studio using this form: Google AI Developer Forum: Share Details About Your Issue. Please only use this form if your issue is the same as the one in this thread; if it’s different, start a new post instead.