Gemini 4 Carbon: who can use it, price and /swarm

Gemini 4 Carbon, Google's most capable AI model, opened up on November 10, 2026. Paying developers and businesses can use it now, and it is rolling out to Google AI Ultra subscribers in the Gemini app, AI Mode in Search and Google Antigravity.

Until this week Carbon was locked away. Google first released it two weeks earlier only to cybersecurity defenders in its Fairwind Program.

Who can use Gemini 4 Carbon

Google's post does not mention the free Gemini app or the AI Pro plan, so if you are not on Ultra, you are still on Gemini 4 Argon for now. Google also does not list countries for the rollout.

Price

For developers, Carbon costs $2 per million input tokens and $10 per million output tokens. That is an introductory price, the same as Argon's, and it ends on November 30, 2026. After that it doubles to $4 and $20.

One thing to know before you switch everything to Carbon: Google says it uses more tokens than Argon because it explores, reasons and runs longer checks. The same job can cost more even at the same price per token.

Carbon vs Argon

Google's own advice is simple. Use Argon for most coding and knowledge work. Use Carbon for the hardest jobs: complex multi-step coding and debugging, and open-ended scientific research.

Carbon also scored better on Google's honesty test, passing 92% of 375 tasks against 70% for Argon, and it refused to invent missing experiment data 98% of the time. Google says it leads several agent benchmarks, including CursorBench 4.0 and Zapier's AutomationBench. These are Google's reported results.

What is /swarm

Alongside the model, Google is previewing /swarm in Google Antigravity. You type one prompt and it becomes a coordinated team of agents:

1. Carbon takes the demanding roles: design, coordination and auditing.
2. Faster, lighter models do the work in parallel, each in its own isolated workspace.
3. Separate "verifier" agents test every change.

You can follow the whole team in real time. It is a preview, so expect it to change. If the idea of agents is new to you, read what an AI agent actually does first.

What it means for you

For most people nothing changes today unless you pay for AI Ultra. If you do, look for Carbon in the Gemini app's model picker as the rollout reaches you. Developers get a cheap window until November 30 to test it.

The timing is no accident: Anthropic shipped Claude Fable 5.2 one day earlier. If you would rather not pay for either, our free AI tools list is the place to start.

AI Tools This Week is not affiliated with Google.