# Google Nano Banana Pro (Gemini 3 Pro Image) API

> Nano Banana Pro (Gemini 3 Pro Image) is the Pro-tier image generation and editing model of Google's Gemini 3 line, using a reasoning core and producing images alongside text. Google positions it for professional work such as complex graphic design, high-fidelity product mockups and factual data visualizations that need accurate text rendering, with real-world grounding via Google Search and studio-quality visuals up to 4K. Pick Nano Banana 2 instead for faster, higher-volume generation.

Source: https://www.sandbase.ai/model/google/gemini-3-pro-image
API reference: https://www.sandbase.ai/model/google/gemini-3-pro-image/docs

## Facts

- Provider: Google
- Type: Language model
- Model ID: `google/gemini-3-pro-image`
- Price: $2 per 1M input tokens, $12 per 1M output tokens
- Context window: 65.5K tokens, up to 32.8K output tokens
- Capabilities: chat, vision, reasoning
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Gemini generateContent API: `POST https://api.sandbase.ai/v1beta/models/google/gemini-3-pro-image:generateContent`

```bash
curl -X POST https://api.sandbase.ai/v1beta/models/google/gemini-3-pro-image:generateContent \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "contents": [
    {
      "role": "user",
      "parts": [
        {
          "text": "A watercolor illustration of a fox in a snowy forest"
        }
      ]
    }
  ],
  "generationConfig": {
    "responseModalities": [
      "TEXT",
      "IMAGE"
    ]
  }
}'
```

## FAQ

### How do I call Google Nano Banana Pro (Gemini 3 Pro Image) through SandBase?

Create a SandBase API key, then send requests with the model ID "google/gemini-3-pro-image" to Gemini generateContent API (/v1beta/models/google/gemini-3-pro-image:generateContent) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does Google Nano Banana Pro (Gemini 3 Pro Image) cost?

$2 per 1M input tokens and $12 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 Nano Banana Pro (Gemini 3 Pro Image)?

65.5K tokens of context, with up to 32.8K output tokens per response.

### Which features does Google Nano Banana Pro (Gemini 3 Pro Image) support?

Google Nano Banana Pro (Gemini 3 Pro Image) supports vision (image input), reasoning. 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 Nano Banana Pro (Gemini 3 Pro Image) and the other models in the catalog; you do not need to sign up with Google separately.