Google expands Gemini 4 Carbon access to developers and subscribers

Google has expanded access to Gemini 4 Carbon, its AI model aimed at complex coding and research tasks, to paying developers and businesses through its API and to AI Ultra subscribers. The move broadens availability beyond an earlier limited preview for cybersecurity defenders. Google said the model is available through Gemini for business and is rolling out to subscribers in the Gemini app, AI Mode in Search and Antigravity.

Introductory API pricing is $2 per million input tokens and $10 per million output tokens through November 30. Google said the rates will rise to $4 and $20, respectively, on December 1. The model can use more tokens than Gemini 4 Argon on the same task, which may increase its total cost. Google describes Argon as the better choice for most software engineering and knowledge work, while positioning Carbon for more demanding assignments.

Google is also previewing a swarm feature in Antigravity that turns one prompt into a coordinated group of AI agents. Developers can assign Carbon roles requiring deeper reasoning, such as architecture and coordination, while lighter models work on parallel tasks. The feature is intended to let users track agents as they...