FLUX.2 Flex

flux-2-flex

Get API keyAPI reference

FLUX.2 [flex] excels at rendering complex text, typography, and fine details, and supports multi-reference editing within the same unified architecture.

Context windowN/A

ProviderFlux

Released2026/01/04

Playground

Pricing

Billing item	Price
Image generation (per megapixel)	$0.0600 / megapixel
Reference image (per megapixel)	$0.0600 / megapixel

How billing works:

• 1 megapixel = 1024×1024 pixels
• Resolution is always rounded up to the next megapixel
• Generated images and reference images are billed separately
• With multiple reference images, each one is billed as 1 megapixel
• Images larger than 4 megapixels are resized down to 4 megapixels

Example:A 1024×1024 image (1 megapixel) costs $0.0600; a 2048×2048 image (4 megapixels) costs $0.2400

Overview

Input

Text Image

Output

Image

API

API integration

Model ID

flux-2-flex

Use this value as the model in image generation requests

API Key

View it in API key management

Bearer token (OAuth 2.0) used to authenticate image generation requests

Image API

https://api.seawhaleai.com/v2/images/generations

Image size

1:1

Square — avatars and icons

2:3

Portrait — phone wallpapers and posters

3:2

Landscape — scenery and banners

3:4

Portrait — Instagram vertical

4:5

Portrait — social media content

5:4

Landscape — presentation slides

9:16

Vertical — full-screen mobile and Stories

16:9

Widescreen — video thumbnails and desktop wallpapers

21:9

Ultrawide — cinematic framing

Multiple aspect ratios are supported for different use cases — social media, ads, wallpapers and more.

flux-2-flex usage examples

The SeaWhale AI image generation endpoint is compatible with the OpenAI Images API and can be called with standard HTTP requests.

cURL

curl https://api.seawhaleai.com/v2/images/generations \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <API_KEY>" \
  -d '{
    "model": "flux-2-flex",
    "prompt": "A cute kitten playing in the sunshine",
    "aspect_ratio": "1:1"
  }'

Python

import requests

url = "https://api.seawhaleai.com/v2/images/generations"
headers = {
    "Content-Type": "application/json",
    "Authorization": "Bearer <API_KEY>",
}
payload = {
    "model": "flux-2-flex",
    "prompt": "A cute kitten playing in the sunshine",
    "aspect_ratio": "1:1",
}

response = requests.post(url, json=payload, headers=headers)
response.raise_for_status()

data = response.json()
print(data["data"][0]["url"])

Node.js

const response = await fetch('https://api.seawhaleai.com/v2/images/generations', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer <API_KEY>',
  },
  body: JSON.stringify({
    model: 'flux-2-flex',
    prompt: 'A cute kitten playing in the sunshine',
    aspect_ratio: '1:1',
  }),
})

const data = await response.json()
console.log(data.data[0].url)