# Google Gemini 4 Carbon API

> Gemini 4 Carbon is Google's most capable Gemini 4 model, released on November 10, 2026 and positioned above Gemini 4 Argon. Google built it for long-horizon agentic work such as complex software engineering, full-stack web development, scientific research and cybersecurity defense. It accepts text, image, video, audio and PDF input with a 1M-token context window, always reasons before answering with low, medium or high effort, and supports function calling and structured output.

Source: https://www.sandbase.ai/models/google/gemini-4-carbon
API reference: https://www.sandbase.ai/models/google/gemini-4-carbon#api

## Facts

- Provider: Google
- Type: Language model
- Model ID: `google/gemini-4-carbon`
- Price: $4 per 1M input tokens, $20 per 1M output tokens
- Context window: 1M tokens, up to 65.5K output tokens
- Capabilities: chat, vision, audio input, reasoning, structured output, function calling
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Chat Completions API: `POST https://api.sandbase.ai/v1/chat/completions`

```bash
curl -X POST https://api.sandbase.ai/v1/chat/completions \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "google/gemini-4-carbon",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}'
```

## FAQ

### How do I call Google Gemini 4 Carbon through SandBase?

Create a SandBase API key, then send requests with the model ID "google/gemini-4-carbon" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does Google Gemini 4 Carbon cost?

$4 per 1M input tokens and $20 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

### What is the context window of Google Gemini 4 Carbon?

1M tokens of context, with up to 65.5K output tokens per response.

### Which features does Google Gemini 4 Carbon support?

Google Gemini 4 Carbon supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

### Do I need a separate Google account?

No. One SandBase API key and balance gives you access to Google Gemini 4 Carbon and the other models in the catalog; you do not need to sign up with Google separately.