Nano Banana 2.1 API

Complete API reference for Nano Banana 2.1 text-to-image and image editing models.

Model Variants

This API supports two model variants:

Quick Comparison

Supported Aspect Ratios

Both models support 14 aspect ratios:

• 16:9, 9:16, 1:1, 3:2, 2:3, 3:4, 4:3, 5:4, 4:5, 21:9, 1:4, 4:1, 1:8, 8:1

Provide the ratio as separate numeric width and height values; for example, width: 16 and height: 9 select 16:9. These values describe a ratio, not output pixel dimensions.

Nano Banana 2.1 (Text-to-Image)

Endpoint

POST /api/v1/image/task

Authentication

Authorization: Bearer YOUR_API_KEY

Request Parameters

Required

Note: The width:height ratio must be one of: 16:9, 9:16, 1:1, 3:2, 2:3, 3:4, 4:3, 5:4, 4:5, 21:9, 1:4, 4:1, 1:8, 8:1.

Optional

Example Request

javascriptCopy
const response = await fetch('https://api.flaq.ai/api/v1/image/task', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model_name: 'nano-banana-2.1',
    prompt: 'A serene mountain landscape at sunset',
    width: 16,
    height: 9,
    resolution: '2k',
    enable_web_search: true,
    enable_image_search: false
  })
});

const { data } = await response.json();
const taskId = data.task_id;

Nano Banana 2.1 Edit (Image Editing)

Endpoint

POST /api/v1/image/task

Request Parameters

Required

Note: The width:height ratio must be one of the 14 supported ratios listed above.

Optional

Single Image Edit Example

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{
  model_name: 'nano-banana-2.1-edit',
  prompt: 'Change the sky to sunset colors',
  width: 16,
  height: 9,
  resolution: '2k',
  image_url_list: ['https://example.com/image.jpg'],
  enable_web_search: false,
  enable_image_search: true
}

Multi-Image Composition Example

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{
  model_name: 'nano-banana-2.1-edit',
  prompt: 'Combine these images into a cohesive landscape',
  width: 16,
  height: 9,
  resolution: '2k',
  image_url_list: ['https://example.com/image1.jpg', 'https://example.com/image2.jpg', 'https://example.com/image3.jpg'],
  enable_web_search: false,
  enable_image_search: false
}

Billing Note: Reference images are charged per image from the first. Each enabled search option adds a separate fixed charge per generation, regardless of image count. See current pricing for rates.

Response Format

Initial Response

jsonCopy
{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}",
    "task_status": "submitted"
  }
}

Polling Response

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{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}",
    "task_status": "processing",
    "task_status_msg": null,
    "task_result": null
  }
}

Successful Response

jsonCopy
{
  "code": 0,
  "message": "success",
  "data": {
    "task_id": "{task_id}",
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}",
    "task_status": "succeed",
    "task_status_msg": null,
    "task_result": {
      "credit": 0.074,
      "images": [
        {
          "url": "https://example.com/generated-image.png"
        }
      ]
    }
  }
}

Status Values

• submitted: Task accepted
• processing: Task is running
• succeed: Task completed successfully
• failed: Task failed

Best Practices

Text-to-Image Tips

1. Describe the Image: Include subject, lighting, and composition in the prompt.
2. Choose a Resolution: Pass 1k, 2k, or 4k in every request.
3. Select an Aspect Ratio: Pass the matching width and height values for one of the 14 supported ratios.
4. Choose Search Options: Omit either search flag for its default false value; set it to true when needed.

Image Editing Tips

1. Provide Reference Images: Include one to 14 accessible image URLs in image_url_list.
2. Describe the Edit: State what should change or be preserved in the prompt.
3. Select Output Settings: Supply the required resolution, width, and height values.
4. Choose Search Options: Web search and image search can be enabled independently.