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API Documentation
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Images
Generate Image

Generate Image

Loading models...
N
Nano Banana Pro (NBP)
NBP0 models support this endpoint

Professional-Grade Creation Upgrade: Enhanced multilingual text rendering, native 4K quality, and stronger consistency in high-definition multi-image outputs.

Generate image

https://api.modelstream.ai
POST/v1/images/generations

Authentication

BearerAuth
AuthenticationBearer <token>

All API requests must be authenticated using a Bearer token in the Authorization header. Please ensure your API key is active.Authorization: Bearer sk-xxxxxx

Parameter Location: Header Param

Request Body

application/json

These parameters come from the selected model form_schema. Switching models updates this list and the request example.

prompt*string

Text instruction for editing/blending. Nano Banana Pro (Gemini 3 Pro Image) performs high-quality editing, restyling, or merging of the uploaded reference images per the prompt, with strong text rendering and complex composition.

RequiredExample Value: A close-up editorial portrait of a stylish female model wearing extravagant alien-shaped futuristic sunglasses, oversized sculptural frames, reflective chrome lenses, high-fashion avant-garde look. She poses confidently in front of a vivid high-saturation color wall with bold gradients of neon pink, electric blue, orange and purple. Clean studio lighting, glossy skin highlights, sharp facial details, luxury fashion campaign style, vibrant colors, cinematic composition, ultra realistic, high resolution.Placeholder: Describe how to edit or blend the reference images...
images*array

Upload the image(s) to edit or blend, up to 11 (up to 6 object images + 5 character images). The model performs image-to-image editing per the prompt.

RequiredValue Range: 0 ≤ value ≤ 11
size?string

Aspect ratio of the output image. Default 1:1.

Example Value: 1:1
Enum/Options:
1:12:33:23:44:34:55:49:1616:921:91:41:84:18:1
quality?string

Output resolution, default 1K. Nano Banana Pro supports 1K / 2K / 4K.

Example Value: 1K
Enum/Options:
1K2K4K
gweb_search?boolean

When enabled, the model will have real-time web search capabilities for up-to-date information.

Example Value: false

Response Parameters

application/json
200apiDocs.responses.successGenerateImage
created?integer

Parameter description for Created

data?array

Parameter description for Data

curl -X POST "https://api.modelstream.ai/v1/images/generations" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "NBP",
  "prompt": "A close-up editorial portrait of a stylish female model wearing extravagant alien-shaped futuristic sunglasses, oversized sculptural frames, reflective chrome lenses, high-fashion avant-garde look. She poses confidently in front of a vivid high-saturation color wall with bold gradients of neon pink, electric blue, orange and purple. Clean studio lighting, glossy skin highlights, sharp facial details, luxury fashion campaign style, vibrant colors, cinematic composition, ultra realistic, high resolution.",
  "n": 1,
  "size": "1:1",
  "quality": "1K",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "A close-up editorial portrait of a stylish female model wearing extravagant alien-shaped futuristic sunglasses, oversized sculptural frames, reflective chrome lenses, high-fashion avant-garde look. She poses confidently in front of a vivid high-saturation color wall with bold gradients of neon pink, electric blue, orange and purple. Clean studio lighting, glossy skin highlights, sharp facial details, luxury fashion campaign style, vibrant colors, cinematic composition, ultra realistic, high resolution."
        }
      ]
    }
  ]
}'
{
  "created": 0,
  "data": [
    {
      "url": "string",
      "b64_json": "string",
      "revised_prompt": "string"
    }
  ]
}