[Gemini 4 Argon hints emerge as Google tests Carbon checkpoint](https://www.testingcatalog.com/gemini-4-argon-hints-emerge-as-google-tests-carbon-checkpoint/)

Google has added new references to the Gemini 4 Argon model in Antigravity, with low, medium, and high reasoning efforts. 

> Gemini web now also shows low, medium, and high reasoning efforts for all models, unifying the reasoning selector across tools. 

> Business Insider recently reported that Google employees are already testing the next Gemini 4 checkpoint, called "Carbon," internally, and it performs at the Opus 5.5 level on coding tasks. 

> The internal coding tool "Jetsky" referenced in the article is also an internal name for Antigravity (not the IDE version). 

Ultrasoon? 

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