Flux Kontext Max API

Complete API reference for Flux Kontext Max with enhanced multi-image context understanding.

Model Overview

Quick Comparison

Supported Aspect Ratios

Both modes support 9 aspect ratios:

• 1:1, 16:9, 9:16, 3:2, 2:3, 4:3, 3:4, 21:9, 9:21

Cost

Flux Kontext Max (Text-to-Image)

Endpoint

POST /api/v1/image/task

Authentication

Authorization: Bearer YOUR_API_KEY

Request Parameters

Required

Note: The width:height ratio must be one of: "1:1", "16:9", "9:16", "3:2", "2:3", "4:3", "3:4", "21:9", "9:21"

Example Request

javascriptCopy
const response = await fetch('https://api.flaq.ai/api/v1/image/task', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model_name: 'flux-kontext-max',
    prompt: 'A futuristic cityscape at night with neon lights',
    width: 16,
    height: 9
  })
});

const { data } = await response.json();
const taskId = data.task_id;

// Poll for results
const pollResponse = await fetch(
  `https://api.flaq.ai/api/v1/image/${taskId}`,
  {
    headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
  }
);

const result = await pollResponse.json();
console.log(result.data.task_result.images[0].url);

Flux Kontext Max (Image-to-Image)

Endpoint

POST /api/v1/image/task

Request Parameters

Required

Note: The width:height ratio must be one of: "1:1", "16:9", "9:16", "3:2", "2:3", "4:3", "3:4", "21:9", "9:21"

Single Image Edit Example

javascriptCopy
{
  model_name: 'flux-kontext-max',
  prompt: 'Enhance this portrait with cinematic lighting',
  width: 3,
  height: 4,
  image_url_list: ['https://example.com/portrait.jpg']
}

Multi-Image Composition Example

javascriptCopy
{
  model_name: 'flux-kontext-max',
  prompt: 'Merge these architectural photos into a unified panorama',
  width: 21,
  height: 9,
  image_url_list: ['https://example.com/arch1.jpg', 'https://example.com/arch2.jpg', 'https://example.com/arch3.jpg']
}

Response Format

Initial Response

Both modes return a task_id for polling:

jsonCopy
{
  "code": 0,
  "data": {
    "task_id": "{task_id}",
    "task_status": "submitted",
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}"
  },
  "message": "success"
}

Polling Response

Poll /api/v1/image/{taskId} to check status:

jsonCopy
{
  "code": 0,
  "data": {
    "task_id": "{task_id}",
    "task_status": "succeed",
    "task_status_msg": null,
    "response_url": "https://api.flaq.ai/api/v1/image/{task_id}",
    "task_result": {
      "credit": 0.08,
      "images": [
        {
          "url": "https://example.com/generated-image.jpeg"
        }
      ]
    }
  },
  "message": "success"
}

Status Values

• submitted: Task accepted
• processing: Generation in progress
• succeed: Generation completed successfully
• failed: Generation failed

Error Handling

Common Errors

Invalid Aspect Ratio

jsonCopy
{
  "code": 400,
  "message": "Ratio must be one of: 1:1, 16:9, 9:16, 3:2, 2:3, 4:3, 3:4, 21:9, 9:21"
}

Missing Image URL (Image-to-Image Mode)

jsonCopy
{
  "code": 400,
  "message": "image_url_list is required for flux-kontext-max"
}

Too Many Images

jsonCopy
{
  "code": 400,
  "message": "Maximum 5 images allowed"
}

Best Practices

Text-to-Image Tips

1. Detailed Prompts: Provide clear, detailed descriptions for best results
2. Aspect Ratio: Choose appropriate aspect ratio for your use case
3. Complex Scenes: Flux Kontext Max excels at complex, detailed scenes
4. Efficient Polling: Check status every 2-3 seconds

Image-to-Image Tips

1. Context-Aware: Leverage multi-image input for context-rich generation
2. High-Quality Input: Use high-resolution source images for best results
3. Clear Transformation Goals: Describe the desired outcome precisely
4. Multi-Image Synergy: Combine up to 5 images for complex compositions

Example Use Cases

High-End Product Photography

javascriptCopy
{
  model_name: 'flux-kontext-max',
  prompt: 'Ultra-realistic product shot of diamond jewelry on black velvet',
  width: 4,
  height: 3
}

Architectural Visualization

javascriptCopy
{
  model_name: 'flux-kontext-max',
  prompt: 'Modern minimalist interior with natural lighting',
  width: 16,
  height: 9
}

Multi-Image Panorama

javascriptCopy
{
  model_name: 'flux-kontext-max',
  image_url_list: ['view1.jpg', 'view2.jpg', 'view3.jpg', 'view4.jpg'],
  prompt: 'Seamless 360-degree panorama of mountain landscape',
  width: 21,
  height: 9
}

Advanced Style Transfer

javascriptCopy
{
  model_name: 'flux-kontext-max',
  image_url_list: ['photo.jpg'],
  prompt: 'Transform into oil painting with Van Gogh style brushwork',
  width: 1,
  height: 1
}