Google released Gemini 4 Carbon on Nov. 10, 2026, and calls it its strongest model. For everyday users, there is a price on the door. Gemini 4 Carbon only shows up in the Gemini app and AI Mode in Search if you pay for Google AI Ultra, which starts at $99.99 a month. If you are on the $19.99 Pro plan, you keep Gemini 4 Argon, and Google itself says Argon is still the right choice for most work.
The short version
Gemini 4 Carbon is Google’s new top AI model, built for long, hard tasks like complex coding and research. Most people do not need to pay for it.
- Everyday users get Gemini 4 Carbon in the Gemini app and AI Mode in Search only on Google AI Ultra, which costs $99.99 or $199.99 a month.
- Google AI Pro costs $19.99 a month, includes Gemini 4 Argon and does not include Carbon.
- Moving from Pro to the cheaper Ultra tier costs an extra $80 a month, or $960 a year.
- Developers can use Carbon through the paid Gemini API at $2 per million input tokens and $10 per million output tokens, the same introductory price as Argon. Google says that price ends Nov. 30, 2026, and then doubles to $4 and $20.
- The downside: Carbon uses more time and computing to think through a task, so for quick questions it is more model than you need.
Who can use Gemini 4 Carbon today
Google’s announcement lists five groups:
- Everyday users: in the Gemini app and AI Mode in Search, if you subscribe to Google AI Ultra.
- Developers: through the paid tier of the Gemini API in AI Studio and Android Studio, at $2 per million input tokens and $10 per million output tokens until Nov. 30, 2026. After that, Google lists $4 and $20. Ultra subscribers can also try it in Google Antigravity, Google’s agentic development platform.
- Businesses: through Gemini for business, by API or from the model menu.
- Scientists and researchers: can apply for free access to Argon and Carbon for six months, subject to eligibility and capacity.
- Cybersecurity teams: can apply to Google’s Fairwind Program for access to Carbon’s security features.
What Gemini 4 Carbon costs you in a year
Here is the math on Google’s current US plan prices, checked Nov. 11, 2026:
| Plan | Monthly price | Per year | Top model in the Gemini app |
|---|---|---|---|
| Free | $0 | $0 | Flash-Lite model |
| Google AI Plus | $4.99 | $59.88 | Flash model |
| Google AI Pro | $19.99 | $239.88 | Gemini 4 Argon |
| Google AI Ultra | $99.99 | $1,199.88 | Gemini 4 Carbon |
| Google AI Ultra, higher limits | $199.99 | $2,399.88 | Gemini 4 Carbon |
Ultra is not only Carbon. Google’s plan page says it also includes a YouTube Premium individual plan, cloud storage starting at 20 TB and the Google Home Premium Advanced plan. If you already pay for some of those, the real extra cost of Carbon is lower than the sticker price. One limit to know: the plan page says Gemini 4 Carbon is available in select countries, and Google AI plans are for ages 18 and up.
What changes for you: if you mostly ask Gemini quick questions, write emails or plan trips, nothing changes. Carbon is built for long jobs, such as debugging a large codebase or digging through a pile of dense documents, where it can spend more time checking its own work.
What Google says Gemini 4 Carbon does better
Google says Carbon is built for tasks that “test the limits of a model’s intelligence”, like complex, multi-step coding and debugging and open-ended scientific research. It says Carbon uses more tokens than Argon “to explore thoroughly, reason deeply, and run extended verification loops.” Tokens are the small chunks of text an AI model reads and writes, and more tokens means more work done behind each answer.
On safety, Google says that in its agentic honesty test of 375 tasks, Carbon passed 92%, compared with 70% for Argon. These are Google’s own numbers, not an outside test, so treat them as a claim to watch rather than a final verdict.
The downside: more thinking means slower answers on simple tasks, and the only consumer way in is the most expensive plan.
Skip if: you use Gemini a few times a day for everyday questions. Pro with Argon, or the free plan, will cover you.
If you are choosing an AI plan right now
Gemini is not the only option on the table this month. Anthropic is including its newest model in its $20 Pro plan for a limited time, and we explained how to turn on Claude Fable 5.2. If you work with AI-made images or video, it is also worth knowing how to use Google’s SynthID Detector to check whether something was made with Google’s AI tools.
