❯ Google opens Gemini 4 Carbon to Ultra subscribers and paid API users for complex work

Access expandsGoogle opened access to Gemini 4 Carbon on November 10. Developers can use it through the paid Gemini API, and enterprises can access it through Gemini for business. Google AI Ultra subscribers can use it in the Gemini app, AI Mode in Search and the Antigravity development environment.

A different job from ArgonArgon remains Google’s choice for most coding and knowledge work. Carbon uses more tokens to explore, execute and verify harder tasks over multiple rounds. In one Google demonstration, several Carbon agents extracted engineering drawings from seven public planning documents and iterated ten times to build an interactive 3D model of an office building.

Two price tiers over timeIntroductory public API pricing runs through November 30 at $2 per million input tokens and $10 per million output tokens, rising to $4 and $20 afterward. Tokens are the units billed for the content a model reads or generates, so repeated checks add to usage. Antigravity is also previewing a collaboration feature that can give Carbon work such as architecture and coordination while assigning other steps to lighter models.

▮ SIGNALCarbon gives teams a way to reserve their strongest model for steps that need repeated verification. That division of work will directly affect the cost of the whole job once the introductory rates double.