Google: Gemini Nano Banana 2.1 (Image to Image) API Reference

About

Nano Banana 2.1 Edit by Google transforms reference images using text instructions, with output resolutions up to 4K and optional video or PDF context.

1. Calling the API

Setup your API Key

To begin using Infron, you first need to create an account and generate your API Key.

Once you have your API key, set it as an environment variable in your runtime environment. This allows your applications to securely access Infron’s API.

export INFRON_KEY="YOUR_API_KEY"

Submit a request

For long-running requests, you can poll for results.

curl https://media.onerouter.pro/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d @- <<'EOF'
{
    "model": "google/gemini-nano-banana-2.1/image-to-image",
    "prompt": "make a photo of the man driving the car down the california coastline.",
    "image_urls": [
        "https://storage.googleapis.com/infron_gcs/quick-upload/2026/10/12/20261012-161023-1321f4ac-1.png"
    ],
    "n": 1,
    "aspect_ratio": "16:9",
    "resolution": "1K",
    "output_format": "png",
    "enable_web_search": true,
    "enable_image_search": false,
    "output_format": "png",
    "response_format": "url"
}
EOF

Response with queue task id

The response will look like this:

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "20261012081156659271714f1jK554Z",
    "object": "image",
    "model": "google/gemini-nano-banana-2.1/image-to-image",
    "status": "created",
    "urls": {
      "query": "https://media.onerouter.pro/v1/images/tasks/20261012081156659271714f1jK554Z"
    },
    "created_at": "2026-10-12 08:11:56.69"
  }
}

Fetch request status

You can fetch the status of a request to check if it is completed or still in progress.

curl https://media.onerouter.pro/v1/images/tasks/{task_id} \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" 

# For example
curl https://media.onerouter.pro/v1/images/tasks/20261012081156659271714f1jK554Z \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json"

Response with queue task status query

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "20261012081156659271714f1jK554Z",
    "object": "image",
    "model": "google/gemini-nano-banana-2.1/image-to-image",
    "status": "in_progress",
    "fail_reason": "",
    "submit_time": 1791792717,
    "start_time": 1791792716,
    "finish_time": 0,
    "outputs": [],
    "created_at": "2026-10-12 08:11:57"
  }
}

Possible statuses:

• created
• in_progress
• processing
• completed
• failed

created -> in_progress → processing → completed | failed

Poll every 1-2 seconds until status is "completed" or "failed"

Get the result (when status is "completed")

Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "20261012081156659271714f1jK554Z",
    "object": "image",
    "model": "google/gemini-nano-banana-2.1/image-to-image",
    "status": "completed",
    "fail_reason": "",
    "submit_time": 1791792717,
    "start_time": 1791792716,
    "finish_time": 1791792735,
    "outputs": [
      "https://infron.ai/cdn/media/image/gemini_1d2fb433-ac9d-4f61-be3f-bc990c87126c.png"
    ],
    "usage": {
      "completion_tokens": 2099,
      "image_count": 1,
      "image_quality": "",
      "prompt_tokens": 1134,
      "resolution": "1K",
      "total_tokens": 3233,
      "web_search": true
    },
    "cost": {
      "total_cost": 0.042644,
      "cost_details": {
        "prompt_cost": 0,
        "completion_cost": 0,
        "image_cost": 0.042644,
        "video_cost": 0,
        "audio_cost": 0,
        "native_web_search_cost": 0,
        "plugin_web_search_cost": 0,
        "tools_cost": 0,
        "prompt_cache_read_cost": 0,
        "prompt_cache_write_cost": 0,
        "prompt_cache_write_5_min": 0,
        "prompt_cache_write_1_h": 0,
        "reasoning_cost": 0,
        "discount_rate": 1,
        "is_byok": false,
        "byok_cost": 0
      }
    },
    "created_at": "2026-10-12 08:11:57"
  }
}

2. Schema

Input

Example request

curl https://media.onerouter.pro/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d @- <<'EOF'
{
    "model": "google/gemini-nano-banana-2.1/image-to-image",
    "prompt": "make a photo of the man driving the car down the california coastline.",
    "image_urls": [
        "https://storage.googleapis.com/infron_gcs/quick-upload/2026/10/12/20261012-161023-1321f4ac-1.png"
    ],
    "n": 1,
    "aspect_ratio": "16:9",
    "resolution": "1K",
    "output_format": "png",
    "enable_web_search": true,
    "enable_image_search": false,
    "output_format": "png",
    "response_format": "url"
}
EOF

Output

Example output

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "20261012081156659271714f1jK554Z",
    "object": "image",
    "model": "google/gemini-nano-banana-2.1/image-to-image",
    "status": "completed",
    "fail_reason": "",
    "submit_time": 1791792717,
    "start_time": 1791792716,
    "finish_time": 1791792735,
    "outputs": [
      "https://infron.ai/cdn/media/image/gemini_1d2fb433-ac9d-4f61-be3f-bc990c87126c.png"
    ],
    "usage": {
      "completion_tokens": 2099,
      "image_count": 1,
      "image_quality": "",
      "prompt_tokens": 1134,
      "resolution": "1K",
      "total_tokens": 3233,
      "web_search": true
    },
    "cost": {
      "total_cost": 0.042644,
      "cost_details": {
        "prompt_cost": 0,
        "completion_cost": 0,
        "image_cost": 0.042644,
        "video_cost": 0,
        "audio_cost": 0,
        "native_web_search_cost": 0,
        "plugin_web_search_cost": 0,
        "tools_cost": 0,
        "prompt_cache_read_cost": 0,
        "prompt_cache_write_cost": 0,
        "prompt_cache_write_5_min": 0,
        "prompt_cache_write_1_h": 0,
        "reasoning_cost": 0,
        "discount_rate": 1,
        "is_byok": false,
        "byok_cost": 0
      }
    },
    "created_at": "2026-10-12 08:11:57"
  }
}

3. Detailed Pricing

Charges depend on actual token usage and search queries. Web and image queries are counted separately. The final amount is returned in data.cost.total_cost.