The free, built-in model that needs no key or setup.
RG AI's free tier runs on a built-in model hosted by RG AI - there's nothing to configure. This is what you're using the moment you open chat without connecting any provider.
The free model runs on infrastructure RG AI pays for directly, so the daily cap exists to keep it usable for everyone rather than a few heavy users. Connecting your own key removes the cap since you're then paying the provider, not RG AI.
Note: The built-in model is intentionally a smaller, efficient model - for the strongest possible answers on demanding tasks, bringing your own key to a frontier provider will generally do better.