Flux 2 Flex - Image Generator

Maximum-quality image generation model by Black Forest Labs with adjustable quality-speed trade-offs and support for up to 10 reference images. Excels at typography, design work, and multi-reference blending.

Also supports Image Editing

This model also supports IMAGE_EDITOR mode for text-based image editing. See Flux 2 Flex - Image Editor.

Endpoint

POSThttps://api.1min.ai/api/features

Request Headers

Field	Value
API-KEY	`<api-key>`
Content-Type	`application/json`

Parameters

Parameter	Type	Required	Description
`type`	string	Yes	Must be `IMAGE_GENERATOR`
`model`	string	Yes	Must be `black-forest-labs/flux-2-flex`
`promptObject`	object	Yes	Configuration object containing all generation parameters

Prompt Object Parameters

Parameter	Type	Required	Description	Default
`prompt`	string	Yes	Text description of the image to generate	-
`aspect_ratio`	string	No	Image aspect ratio (1:1, 16:9, 9:16, 3:2, 2:3, 4:5, 5:4)	1:1
`output_format`	string	No	Output file format (jpg, png)	png
`output_quality`	number	No	Output image quality (0-100)	80
`steps`	number	No	Number of diffusion steps; fewer (6-10) for speed, more (20-50) for quality	25
`guidance`	number	No	Prompt adherence scale (2-5)	3
`safety_tolerance`	number	No	Content safety threshold (1=strictest, 6=most permissive)	2
`prompt_upsampling`	boolean	No	Automatically enhance prompt for more creative output	false
`seed`	number	No	Random seed for reproducibility	Random

Code Examples

cURL
JavaScript
Python

curl --location 'https://api.1min.ai/api/features' \
--header 'API-KEY: <api-key>' \
--header 'Content-Type: application/json' \
--data '{
"type": "IMAGE_GENERATOR",
"model": "black-forest-labs/flux-2-flex",
"promptObject": {
  "prompt": "A vibrant event poster with bold typography: SUMMER FEST 2026, colorful gradient background",
  "aspect_ratio": "9:16",
  "steps": 30,
  "guidance": 4,
  "output_format": "png",
  "output_quality": 90,
  "safety_tolerance": 2
}
}'

fetch('https://api.1min.ai/api/features', {
method: 'POST',
headers: {
  'Content-Type': 'application/json',
  'API-KEY': 'YOUR_API_KEY'
},
body: JSON.stringify({
  type: 'IMAGE_GENERATOR',
  model: 'black-forest-labs/flux-2-flex',
  promptObject: {
    prompt: 'A vibrant event poster with bold typography: SUMMER FEST 2026, colorful gradient background',
    aspect_ratio: '9:16',
    steps: 30,
    guidance: 4,
    output_format: 'png',
    output_quality: 90,
    safety_tolerance: 2
  }
})
})

import requests

url = "https://api.1min.ai/api/features"
headers = {
"Content-Type": "application/json",
"API-KEY": "YOUR_API_KEY"
}

data = {
"type": "IMAGE_GENERATOR",
"model": "black-forest-labs/flux-2-flex",
"promptObject": {
  "prompt": "A vibrant event poster with bold typography: SUMMER FEST 2026, colorful gradient background",
  "aspect_ratio": "9:16",
  "steps": 30,
  "guidance": 4,
  "output_format": "png",
  "output_quality": 90,
  "safety_tolerance": 2
}
}

response = requests.post(url, headers=headers, json=data)

Interactive Playground

API Playground

https://api.1min.ai/api/features

AI Model *

Prompt *

Describe the image you want to generate

Aspect Ratio

Steps

Diffusion steps: 6-10 for speed, 20-50 for quality

Guidance

Prompt adherence scale (2-5)

Safety Tolerance

Content safety threshold (1=strictest, 6=most permissive)

Prompt Upsampling

Output Quality

Output image quality (0-100)

Seed

Random seed for reproducibility

Generated cURL Command:

curl -X POST "https://api.1min.ai/api/features" \
  -H "API-KEY: <your-api-key>" \
  -H "Content-Type: application/json" \
  -d '{
  "type": "IMAGE_GENERATOR",
  "model": "black-forest-labs/flux-2-flex",
  "promptObject": {
    "prompt": "A vibrant event poster with bold typography: SUMMER FEST 2026, colorful gradient background",
    "aspect_ratio": "9:16",
    "steps": 30,
    "guidance": 4,
    "output_format": "png",
    "output_quality": 90,
    "safety_tolerance": 2
  }
}'

Response Format

{
"aiRecord": {
  "uuid": "e5f6a7b8-c9d0-1234-efab-345678901234",
  "model": "black-forest-labs/flux-2-flex",
  "type": "IMAGE_GENERATOR",
  "status": "SUCCESS",
  "createdAt": "2026-03-27T10:00:00.000Z",
  "aiRecordDetail": {
    "promptObject": {
      "prompt": "A vibrant event poster with bold typography: SUMMER FEST 2026, colorful gradient background",
      "aspect_ratio": "9:16",
      "steps": 30,
      "guidance": 4,
      "output_format": "png",
      "output_quality": 90,
      "safety_tolerance": 2
    },
    "resultObject": [
      "development/images/2026_03_27_10_00_05_001_poster.png"
    ]
  },
  "temporaryUrl": "https://s3.us-east-1.amazonaws.com/asset.1min.ai/development/images/2026_03_27_10_00_05_001_poster.png?..."
}
}

Use Cases

Typography & Design: Posters, infographics, and UI mockups with sharp text rendering
Style Transfer: Multi-reference blending for consistent visual style
Flexible Production: Tune quality vs speed by adjusting steps
Brand Assets: Design-heavy materials requiring readable text and fine detail

Endpoint​

Request Headers​

Parameters​

Prompt Object Parameters​

Code Examples​

Interactive Playground​