In one case I had to upgrade my Antigravity GUI to see new models, I guess because of an API change.

At the same time, the CLI saw the new models without any change. Possibly that was just because my CLI install was newer than the GUI one.

Edit: But in this case:

> Gemini 4 Carbon is available via the API in Google AI Studio and Gemini for business for all paying developers and enterprises

I.e. Seems to be API only right now.