Google began rolling out Gemini 4 Carbon, which it calls its strongest model, on November 10, 2026, according to PPC Land's account of the announcement by Koray Kavukcuoglu, SVP at Google DeepMind and Chief AI Architect at Google. Carbon is going to Google AI Ultra subscribers in AI Mode in Search, the Gemini app and Google Antigravity, and is available through the Gemini API and Gemini for business to all paying developers and enterprises.
The introductory API price matches Gemini 4 Argon: $2 per million input tokens and $10 per million output tokens. Google says Carbon reaches its results by using more tokens than Argon to reason and verify, and PPC Land notes the post gives no token ratio, no cost comparison with Argon and no end date for the introductory rate. Google claims Carbon ranks first on three third-party benchmarks at more than 2X lower cost per task than the next best external model, which it does not name.
PPC Land reports the post names no route to Carbon for AI Pro subscribers, although Argon reached AI Mode for both Pro and Ultra. PPC Land has reported Ultra starting at $99.99 a month, against $19.99 for Pro. The post says nothing about ads, citations, Google Ads or Merchant Center, and names no countries or languages for the consumer rollout. Google also previewed /swarm, a feature in Antigravity that turns one prompt into a coordinated team of agents.