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POST
/
v1
/
images
/
generations
curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3.1-flash-image-preview",
    "prompt": "A cyberpunk city at night with flickering neon lights",
    "size": "16:9",
    "n": 1,
    "metadata": {
      "resolution": "2K"
    }
  }'

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "gemini-3.1-flash-image-preview",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}

Documentation Index

Fetch the complete documentation index at: https://docs.toapis.com/llms.txt

Use this file to discover all available pages before exploring further.

  • Google Gemini 3.1 Flash image generation model (Nano banana2)
  • Use model parameter to select gemini-3.1-flash-image-preview model
  • Supports text-to-image and image-to-image, up to 4K resolution output
  • Up to 14 reference images to maintain style/character consistency
  • Supports extreme aspect ratios (1:4, 4:1, 1:8, 8:1)
  • Integrated Google Search enhancement for more accurate real-world images
  • Async task management, query results by task ID
Important Change: For better performance and cost control, we no longer support passing base64 image data directly in image_urls. Please use the Upload Image API first to upload images and get URLs, then call this endpoint.

​
Authorizations

​
Authorization
string
required
All endpoints require Bearer Token authenticationGet your API Key from the API Key Management PageAdd to request header:
Authorization: Bearer YOUR_API_KEY

​
Body

​
model
string
default:"gemini-3.1-flash-image-preview"
required
Image generation model nameExample: "gemini-3.1-flash-image-preview"
​
prompt
string
required
Text description for image generation
​
size
string
Image aspect ratioSupported ratios:
ValueUse Case
1:1Square, avatar, social media
3:2 / 2:3Standard photo
4:3 / 3:4Traditional display ratio
16:9 / 9:16Widescreen / vertical video cover
5:4 / 4:5Instagram images
21:9Ultra-wide banner
1:4 / 4:1Long poster / banner
1:8 / 8:1Extreme long image / ad banner
​
n
integer
default:1
Number of images to generate⚠️ Note: Must be a pure number (e.g. 1), do not add quotes, otherwise it will error
​
image_urls
object[]
List of reference image URLs for image-to-image or image editingLimit: Maximum 14 images (recommended: up to 10 object references + 4 character references)
​
metadata
object
Metadata parameters for passing additional configuration options

​
Response

​
id
string
Unique task identifier for status queries
​
object
string
Object type, always generation.task
​
model
string
Model name used
​
status
string
Task status
  • queued - Queued for processing
  • in_progress - Processing
  • completed - Successfully completed
  • failed - Failed
​
progress
integer
Task progress percentage (0-100)
​
created_at
integer
Task creation timestamp (Unix timestamp)
​
metadata
object
Task metadata
curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3.1-flash-image-preview",
    "prompt": "A cyberpunk city at night with flickering neon lights",
    "size": "16:9",
    "n": 1,
    "metadata": {
      "resolution": "2K"
    }
  }'

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "gemini-3.1-flash-image-preview",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}