Google opens Gemini 4 Carbon, its strongest model, to developers and Ultra subscribers

On 10 November 2026 Google announced that Gemini 4 Carbon, which it calls its strongest model, is now available to developers, enterprises, scientists and consumers. Two weeks earlier it had been released only to selected cybersecurity defenders through Google’s Fairwind Program.

What Google says it is for

According to Google, Gemini 4 Argon remains the default choice for most coding and office work, while Carbon is aimed at the hardest tasks — multi-step coding and debugging, open-ended scientific research — and spends more tokens on reasoning and verification. Google also previewed /swarm in its Antigravity tool, which turns one prompt into a team of coordinated agents.

Price and access

• API (Google AI Studio, Gemini for business): introductory price of $2 per million input tokens and $10 per million output tokens, the same as Argon.
• After 30 November 2026 the price rises to $4 / $20.
• Rolling out to Google AI Ultra subscribers in the Gemini app, AI Mode in Search and Antigravity.

Claims to keep in perspective

Google says Carbon ranks first on several third-party benchmarks (including CursorBench 4.0 and Zapier’s AutomationBench) at lower cost per task, and that in its safety testing the model blocked 99% of simulated attack trajectories. These are the company’s own figures; independent evaluations will take time.