Google has opened Gemini 4 Carbon to the public.

Announced on November 10, Carbon is Google's most capable model for work that tests the limits of a model's intelligence — long-horizon agentic workflows, complex multi-step coding and debugging, open-ended scientific research, and cybersecurity. Gemini 4 Argon remains the ideal choice for most software engineering and knowledge work.

Carbon is now available to paying developers through the Gemini API in AI Studio and Android Studio, to enterprises through Gemini for business, Antigravity, and CodeMender, and is rolling out to Google AI Ultra subscribers in Antigravity, the Gemini app, and AI Mode in Search. It follows a two-week limited rollout to cybersecurity defenders through Google's Fairwind Program. Scientists and researchers can apply for free Antigravity access for six months.

Introductory pricing is $2 per million input tokens and $10 per million output tokens until November 30, rising to $4 and $20 from December 1.

Google is also previewing /swarm in Antigravity: one prompt becomes a coordinated team of AI agents — Carbon takes the deepest-reasoning roles like architecture, coordination, and auditing, while faster, lighter models work in parallel and adversarial verifiers test every change. The whole process can be watched in real time.

Google says Carbon ranks #1 on CursorBench 4.0, Perplexity WANDR, and Zapier AutomationBench.