Gemini 4 Hydrogen (Flash) spotted rolling out in Antigravity, available to Pro subs
testingcatalog · x · 2026-11-13
TestingCatalog reports that Google's new Gemini 4 Hydrogen (Flash tier) is rolling out in the Antigravity coding IDE, requiring the latest version to try. A quoted screenshot shows the model picker listing Gemini 4 Hydrogen (Medium), and it's reportedly available to Pro subscribers as well. The interface also shows Gemini 4 Argon, Gemini 3.8 Flash, Claude Opus/Sonnet 5.5, with Gemini 4 Carbon marked unavailable. Unconfirmed early leak, still in testing.
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