gemini-3-pro-image-preview (text to image)

curl --location 'https://gptproto.com/api/v3/google/gemini-3-pro-image-preview/text-to-image' \
--header 'authorization: sk-xx' \
--header 'content-type: application/json' \
--data '{
    "prompt": "a cat",
    "size":"4K",
    "aspect_ratio": "1:1",
    "enable_base64_output": false,
    "enable_sync_mode": false,
    "output_format": "png"
  }'

{
  "error": {
    "message": "Invalid signature",
    "type": "401"
  }
}

​

Parameters

• Default: a cat
• A text description of the desired image(s)

• The size of the generated images
• Options: 1K, 2K, 4K

• Default: 1:1
• The aspect ratio of the generated image
• Supported values: 1:1, 2:3, 3:2, 3:4, 4:3, 9:16, 16:9, 21:9

• Default: 1
• The number of images to generate
• Must be between 1 and 10

• Default: auto
• Allows to set transparency for the background of the generated image(s)
• This parameter is only supported for gpt-image-1
• Must be one of transparent, opaque or auto
• When auto is used, the model will automatically determine the best background for the image

• Default: false
• Whether to enable base64 output format
• Options: false, true

• Default: false
• Whether to enable synchronous mode
• Options: false, true

• Default: png
• The output format of the generated image
• Example: png