Gemini 4 Carbon is out: who gets it and what it costs after Nov 30

Gemini 4 Carbon is out, and the Gemini 4 Carbon price is the part most launch videos skip. Google released the model on Nov 10, 2026, two weeks after it was shown to a small group of testers. In the Gemini app it is rolling out to Google AI Ultra subscribers only, and developers pay an introductory API price that doubles after Nov 30.

The videos about it this week call it a beast and test it as if everyone has it. Most people don't, at least not in the app.

What Google released

Google calls Carbon its strongest model, built for "long-horizon agentic workflows across complex knowledge work, software engineering, and scientific reasoning." It uses more tokens than Gemini 4 Argon to think through a task and check its own work.

Alongside it, Google is previewing /swarm in Google Antigravity, its coding app. One prompt becomes "a coordinated team of agents you can track in real time."

Google also published its own test results. On its 375-task agentic honesty benchmark, Carbon passed 92% of tasks against 70% for Argon. These are Google's numbers, not an outside test.

Who gets Gemini 4 Carbon

In Google's words, it is "rolling out to all Google AI Ultra subscribers in Google Antigravity, the Gemini app, and AI Mode in Search." The post doesn't mention the free Gemini app or Google AI Pro.

Developers can use it through the paid Gemini API in Google AI Studio, and businesses through Gemini for business.

The Gemini 4 Carbon price after Nov 30

On the API, Carbon starts at the same introductory price as Argon: $2 per million input tokens and $10 per million output tokens. Google's footnote says that "after the introductory period expires on November 30, 2026, the price of $4 per 1M input tokens and $20 per 1M output tokens will apply."

If you are building on it now, plan your costs for the higher price from Dec 1.

FAQ

Is Gemini 4 Carbon free?

No. In the Gemini app it is rolling out to Google AI Ultra subscribers. On the API it is for paying developers.

How much does Gemini 4 Carbon cost on the API?

$2 per million input tokens and $10 per million output tokens until Nov 30, 2026. From then on, $4 and $20.

What is /swarm in Google Antigravity?

A preview feature where one prompt starts a team of agents that work on a larger project together, and you can follow them in real time.

Sources

• Google: Gemini 4 Carbon is now available