Understanding Gemini API Billing: Does Upgrading to a Paid Tier Affect Free Usage?

As I explore the possibilities of upgrading to a paid tier on the Gemini API, I’ve come across a significant change regarding the usage of pro models. The functionality offered in the free tier will no longer support access to these advanced models, which has led me to consider whether enabling billing is a necessary step.

This situation prompts several important inquiries, particularly about how the billing structure operates once I switch to a paid tier. My primary concern is whether the paid plan still accommodates any free usage allowances. Specifically, I would like to clarify the following:

When I upgrade to a paid tier, will I still have access to a free usage threshold? In other words, does the billing only initiate charges for usage that exceeds the limits established by the free tier, or does everything become subject to charges immediately upon enabling billing?

Understanding these nuances is crucial for effectively managing costs while maximizing the potential of the Gemini API. Any insights or experiences from those who’ve navigated this transition would be greatly appreciated!