# Gemini 4 Carbon arrives on Token Tunnel

> Gemini 4 Carbon runs through Token Tunnel on Google AI Ultra and Enterprise plans, and Gemini 4 Argon joins our hosted chat completion service.

Nov 11, 2026. Topics: Models. https://www.generalinput.com/changelog/2026-11-11-gemini-4-carbon

Google released Gemini 4 Carbon on November 10. If your Google plan includes it, you can now pick it for specialists, workflows, and chats through [Token Tunnel](/token-tunnel), on the subscription you already pay for. Google says Carbon spends more thinking on each turn than Gemini 4 Argon, which suits long, multi-step agent work. For now Carbon runs only through subscriptions, not on our keys, so it costs no credits per token and isn't one of our hosted models. Auto and your default model don't change.

### How it works

- **Which plans.** Google offers Carbon in Antigravity on AI Ultra and Enterprise plans. The tunnel lists it as soon as your signed-in Google account serves it, under the name Gemini 4 Carbon.
- **Thinking.** Antigravity serves Carbon at its high thinking level.
- **Context.** The tunnel plans for 200,000 tokens of context on Carbon for now, summarizing earlier work in a long conversation past that, until we've measured how much Antigravity accepts.
- **Who can turn it off.** Workspace admins can switch Carbon off for everyone, with the same switch every model has, and each member can turn it off for their own subscription.

### Also shipped

- Workflows and apps that call our hosted chat completion service can now name Gemini 4 Argon as their model. Compare it with the other hosted models on the [models page](/models).