Gemini 4 Carbon
Google's Gemini 4 Carbon, announced 28 Oct 2026 to a limited set of cyber defenders and made generally available to paying API developers on 10 Nov 2026 (the release date shown). The post-trained, deeper-reasoning sibling of Gemini 4 Argon on the same sparse mixture-of-experts base. Artificial Analysis Intelligence Index v5.0.1 scores it 60 at high effort (58 at medium) — second only to Claude Fable 5.2 at 65, and ahead of Claude Opus 5.5 at 59 per secondary reports. Google's launch price of $2/$10 per 1M tokens (cache reads $0.10) ends on 30 Nov 2026: from 1 Dec it is $4/$20 (cache $0.20), which is the price Artificial Analysis currently lists and the one to budget for. Thinking tokens bill as output, and Carbon spends them freely: 205M output tokens across the Index (median 72.8M) at $7.76 per Index task. 1,048,576-token window shared between input and output, 65,536 output tokens per synchronous request, text, image, video, audio and PDF in, text out, implicit caching only. Google reports first place on CursorBench 4.0, Perplexity WANDR and Zapier AutomationBench at over 2x lower cost per task than the next-best external model (vendor claim).
1M
tokens
66K
tokens
$2
per 1M tokens
$10
per 1M tokens
78
tokens/sec
Nov 2026
2026-11-10
$6.00
per 1M tokens
16.5
quality per $
Capabilities
Benchmarks
Price vs Quality
Context Window in Context
- GPT-5.6 Sol1.1M
- GPT-5.6 Terra1.1M
- GPT-5.6 Luna1.1M
- GPT-6 Astra1.1M
- ▸ Gemini 4 Carbon1.0M
- Kimi K31.0M
- Gemini 4 Argon1.0M
- Kimi K3.1 Pro1.0M
Not on our gateway yet
Swfte Connect does not hold a key for Gemini 4 Carbon, so there is nothing to run here. Add your own provider key and call it with the same API as every other model in this directory.
curl https://api.swfte.com/agents/v2/gateway/chat/completions \
-H "Authorization: Bearer $SWFTE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "google:gemini-4-carbon",
"messages": [{"role": "user", "content": "Hello"}]
}'About Gemini 4 Carbon
Gemini 4 Carbon is a flagship AI model by Google, released on November 10, 2026. It supports a context window of 1049K tokens and can generate up to 66K output tokens.
At $2 per million input tokens and $10 per million output tokens, its blended cost of $6.00/1M tokens places it in the premium pricing tier. Its value score of 16.5 reflects the balance of quality and cost.
Using Gemini 4 Carbon with Swfte
Access Gemini 4 Carbon through Swfte Connect, our unified LLM gateway. Connect gives you a single API for 50+ models, with automatic routing, cost optimization, and fallback handling. You can also try Gemini 4 Carbon in our AI Playground before integrating.