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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-official",
    "prompt": "An ink wash painting of mountains and rivers, layered peaks with swirling mist",
    "size": "16:9",
    "n": 1,
    "metadata": {
      "temperature": 1.0,
      "topP": 0.95,
      "resolution": "1K",
      "personGeneration": "ALLOW_ALL",
      "thinkingConfig": {
        "thinkingLevel": "HIGH"
      }
    }
  }'

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "gemini-3.1-flash-image-preview-official",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}
  • Direct connection to Google Vertex AI using the Gemini 3.1 Flash Image native API
  • Select the gemini-3.1-flash-image-preview-official model via the model parameter
  • Supports text-to-image and image-to-image generation
  • Supports native generation parameters like temperature, topP, and maxOutputTokens
  • Supports resolution (1K/2K/4K), personGeneration, and imageOutputOptions image configuration
  • Supports thinkingConfig thinking mode for improved complex scene generation
  • Supports safetySettings for content safety control
  • Supports extreme aspect ratios (4:1, 8:1)
  • Asynchronous task management with task ID for result querying
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 endpoint to upload images first, then use the returned URL in this API.

​
Authorizations

​
Authorization
string
required
All endpoints require Bearer Token authenticationGet API Key: Visit the API Key Management page to obtain your API KeyAdd to request headers:
Authorization: Bearer YOUR_API_KEY

​
Body

​
model
string
default:"gemini-3.1-flash-image-preview-official"
required
Image generation model nameExample: "gemini-3.1-flash-image-preview-official"
​
prompt
string
required
Text description for image generation
​
size
string
Image aspect ratioSupported formats:
  • 1:1 - Square
  • 3:2 / 2:3
  • 3:4 / 4:3
  • 4:5 / 5:4
  • 9:16 / 16:9
  • 21:9
  • 4:1 / 8:1 - Extreme widescreen ratios
​
n
integer
default:1
Number of images to generateFixed at 1
​
image_urls
string[]
Reference image URL array for image-to-image generation or editing⚠️ Only URL format is supported (base64 is no longer supported)
  • Publicly accessible image URLs (http:// or https://)
  • Use the Upload Image endpoint to upload local images and get URLs
Limits:
  • Maximum 14 images
  • Maximum file size per image: 10MB
  • Supported formats: .jpeg, .jpg, .png, .webp
​
metadata
object
Vertex AI native extension parameters

​
Response

​
id
string
Unique task identifier for querying task status
​
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-official",
    "prompt": "An ink wash painting of mountains and rivers, layered peaks with swirling mist",
    "size": "16:9",
    "n": 1,
    "metadata": {
      "temperature": 1.0,
      "topP": 0.95,
      "resolution": "1K",
      "personGeneration": "ALLOW_ALL",
      "thinkingConfig": {
        "thinkingLevel": "HIGH"
      }
    }
  }'

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