Its plan table marks both unavailable on Free and Google AI Plus, available on Google AI Pro and Google AI Ultra, and unavailable on Enterprise. A footnote says Claude 5.5 is available on Google AI Pro only for non-trial subscriptions. The page says users select a reasoning model from the model selector beneath the conversation prompt box. It does not specify when these entries were added or independently establish rollout status for every account.
Raw SignalOct 3, 20261 min read1 source
Models | Google Antigravity Docs
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Google Antigravity’s models documentation lists Claude Sonnet 5.5 (thinking) and Claude Opus 5.5 (thinking) as reasoning-model options.