Antigravity lists Gemini 4 Argon for Google AI Pro trials on eligible premium devices

What the Antigravity models page shows

As of October 22, 2026, the Antigravity models page puts a footnote on Gemini 4 Argon's Google AI Pro entry. It says Argon is available with paid Google AI Pro plans or on trial with eligible premium devices. The same reasoning model table lists Argon for Google AI Ultra and Enterprise but not for Free and Google AI Plus.

The models page does not say which devices count as eligible premium devices, and it gives no start date for this access. Its only instruction for moving to a paid Google AI Pro plan is to submit a request.

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Claude 5.5 models stay non-trial only on Pro

The trial wording covers only Argon. Claude Sonnet 5.5 (thinking) and Claude Opus 5.5 (thinking) have a different footnote on the Pro column: available on Google AI Pro for non-trial subscriptions only. Trial users who want those models are told to cancel the trial and switch to a paid Google AI Pro plan by submitting a request.

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What it means for your usage

This page gives no usage numbers for Argon on a Pro trial. The View Usage panel in the model selector splits limits into two groups: Gemini models, and Claude and GPT models. Each group has its own Weekly Limit Remaining and Five Hour Limit Remaining. For the reasoning model rate limits themselves, the page sends readers to Antigravity's plans page.

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Where Argon runs

Argon is not available in the Antigravity IDE. The page lists it for the Antigravity App, the Antigravity CLI and IDE extensions.

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