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API Documentation
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Images
Generate Image

Generate Image

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G
GPT-5 mini (gpt-5-mini)
gpt-5-mini0 models support this endpoint

GPT-5-Mini condenses the cutting-edge reasoning algorithms of the GPT-5 series into an ultra-fast model. It surpasses all previous lightweight models in logical density, handling complex semantic analysis and dynamic decision-making with microsecond-level response. It is the core for future applications that demand both extreme efficiency and top-tier intelligence.

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.

system_prompt?string

Global instructions or persona for the model.

Example Value: You are a helpful and expert assistant.Placeholder: e.g., You are a senior software architect...
prompt*string
RequiredExample Value: Hello! What can you do?Placeholder: Enter your question or instructions...
image_urls?array

Supports multi-image understanding (optional).

Value Range: 0 ≤ value ≤ 10
image_detail?string
Example Value: auto
Enum/Options:
Auto: autoLow: lowHigh: high
reasoning_effort?string

Controls how much reasoning effort the model spends before answering.

Example Value: medium
Enum/Options:
Minimal: minimalLow: lowMedium: mediumHigh: high
verbosity?string

Controls how verbose the response is.

Example Value: medium
Enum/Options:
Low: lowMedium: mediumHigh: high
max_completion_tokens?number
Example Value: 8192Value Range: 1 ≤ value ≤ 128000
response_format?string
Example Value: text
Enum/Options:
Text: textJSON Object: json_object
stream?boolean
Example Value: true

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": "gpt-5-mini",
  "messages": [
    {
      "role": "developer",
      "content": "You are a senior software architect."
    },
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Analyze this diagram and suggest improvements for scalability."
        },
        {
          "type": "image_url",
          "image_url": {
            "url": "https://example.com/arch.png",
            "detail": "high"
          }
        }
      ]
    }
  ],
  "reasoning_effort": "high",
  "verbosity": "medium",
  "max_completion_tokens": 4096,
  "stream": true
}'
{
  "created": 0,
  "data": [
    {
      "url": "string",
      "b64_json": "string",
      "revised_prompt": "string"
    }
  ]
}