Overview
- Google broadened access to Gemini 4 Carbon for paying developers, enterprises, and Google AI Ultra subscribers through the Gemini API, AI Studio, the Gemini app, Antigravity, and AI Mode in Search, a move announced Tuesday that follows a limited Fairwind preview for vetted cybersecurity defenders.
- Introductory pricing is $2 per 1 million input tokens and $10 per 1 million output tokens through November 30, after which Google will double those rates, and Google offers large discounts for cached inputs during the promo period.
- Carbon is built on the Gemini 4 Argon architecture but runs extra internal ‘‘thinking’’ steps that use more tokens, share the same roughly one‑million token unified context window, and bill thinking tokens at the output rate which can make real tasks cost more than Argon jobs.
- Google previewed a /swarm multi‑agent feature in Antigravity that turns one prompt into coordinated teams of specialized agents and lets teams assign Carbon to roles needing deepest reasoning, such as architecture, auditing, and verification.
- Google said Carbon plus its new AlphaProof Code agents produced millions of lines of Lean proofs that verify security properties of Google’s libsignal build, but the company acknowledged limits to the scope of the proofs, retained gating for cyber uses, and independent third‑party validation and real‑world cost studies are still pending.