Google rolls out Gemini 4 Carbon to AI Ultra subscribers

When Google unveiled Gemini 4 Carbon in late October, a select group of cybersecurity defenders was the first to get it. Two weeks later, the model is making its way into the Gemini app and AI Mode in Google Search.

Google began the wider rollout on November 10, opening access to AI Ultra subscribers, paying developers, and businesses. Google AI Ultra starts at $100 a month in the US and also unlocks Carbon in Antigravity, Google’s AI coding platform.

In Search, eligible subscribers can select Gemini 4 Carbon from the model menu in AI Mode. That option requires a personal Google account, is available to subscribers 18 and older in supported countries, and has daily usage limits. Google’s announcement gives no timeline for access on lower-priced plans.

Carbon joins Gemini 4 Argon, which Google still recommends for most coding and knowledge work. Carbon uses more tokens to explore a problem and check its own work, making it better suited to jobs like debugging an issue that spans several parts of an app. Google cites first-place results on CursorBench 4.0 for coding and Zapier’s AutomationBench for workflow automation.

Developers can use Carbon through the paid Gemini API in Google AI Studio and Android Studio, and businesses can select it in Gemini for Business. Standard API pricing matches Argon’s introductory rates through November 30 at $2 per million input tokens and $10 per million output tokens. Both Carbon rates double on December 1.

Google is also previewing /swarm in Antigravity, which lets developers turn one prompt into a project for several AI agents and watch their progress in real time. Carbon can handle the overall design while faster models work on individual pieces in parallel.