How much does FLUX.2 [klein] 4B cost?

$0.001 per output megapixel (0.25 and 0.5 megapixels are billed as one) plus $0.001 per reference image. A 1-megapixel image from a text prompt costs $0.001; the maximum, five references at 4 megapixels, is $0.009.

How do I call FLUX.2 [klein] 4B?

It runs on Hormouz's asynchronous predictions API: submit a prediction with your prompt, then poll until the image is ready. Point your base URL at Hormouz and use a Hormouz API key.

Can FLUX.2 [klein] 4B edit images?

Yes. Send up to five images in the images field and describe the change in the prompt. Use aspect_ratio match_input_image to keep the shape of the first image. Each reference image adds $0.001.

What output sizes does it support?

Set output_megapixels to 0.25, 0.5, 1, 2 or 4 (default 1), with an aspect_ratio from 1:1 to 21:9 in either orientation. Output format can be jpg (default), png or webp.

How do I access FLUX.2 [klein] 4B from inside Iran?

Hormouz serves it from inside Iran over a stable connection. You pay in Iranian rial through the dashboard, with no foreign card or circumvention tooling needed.

flux-2-klein-4b: image generation model

FLUX.2 [klein] 4B is Black Forest Labs' compact image model for very fast generation and editing, from a tenth of a cent per image. Served asynchronously from inside Iran through Hormouz.

Pricing:: $0.001000 – $0.009000 / image
Type:: image

Image generation

FLUX.2 [klein] 4B is a 4-billion-parameter image model distilled from Black Forest Labs' larger FLUX.2 model. It generates in four steps, so a typical image is ready in a second or two, while keeping much of its teacher's grasp of lighting, composition and legible text in images. It is open-weight under Apache 2.0.

It is served through Hormouz behind an asynchronous predictions API: submit a prediction, then poll until the image is ready. The required input is a prompt. Pass up to five reference images in images to edit a picture or keep a product or character consistent, choose an output size with output_megapixels (0.25, 0.5, 1, 2 or 4; default 1) and set aspect_ratio (default 1:1, or match_input_image).

Pricing follows what you ask for: $0.001 per output megapixel (0.25 and 0.5 are billed as one) plus $0.001 per reference image. A plain 1-megapixel image costs $0.001 and the largest request — five references at 4 megapixels — costs $0.009. Hormouz provides stable access from inside Iran, with no foreign credit card or circumvention tooling required.

Quickstart

# Create the prediction, then poll until succeeded
curl -s https://api.hormouz.net/v1/predictions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"version":"black-forest-labs/flux-2-klein-4b","input":{"prompt":"A beautiful sunset"}}'

Specs

Vendor	Black Forest Labs
Type	Image
Context window	—
Pricing	$0.001000 – $0.009000 / image
API	predictions

Code example

cURL

# Create the prediction, then poll until succeeded
curl -s https://api.hormouz.net/v1/predictions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"version":"black-forest-labs/flux-2-klein-4b","input":{"prompt":"A beautiful sunset"}}'

Python

import requests
BASE = "https://api.hormouz.net/v1"
H = {"Authorization": "Bearer ng-YOUR_API_KEY", "Content-Type": "application/json"}
r = requests.post(f"{BASE}/predictions", headers=H,
    json={"version": "black-forest-labs/flux-2-klein-4b", "input": {"prompt":"A beautiful sunset"}})
print(r.json()["id"])

JavaScript

const BASE = "https://api.hormouz.net/v1";
const res = await fetch(`${BASE}/predictions`, {
  method: "POST",
  headers: { Authorization: "Bearer ng-YOUR_API_KEY", "Content-Type": "application/json" },
  body: JSON.stringify({ version: "black-forest-labs/flux-2-klein-4b", input: {"prompt":"A beautiful sunset"} }),
});
const { id } = await res.json();

Buy the flux-2-klein-4b API, paid in rial

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One Hormouz key reaches flux-2-klein-4b and 600+ other models, and you pay only for what you use.
No VPN and no risk of a banned account; just change the base URL to api.hormouz.net/v1.

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FAQ

How much does FLUX.2 [klein] 4B cost?: $0.001 per output megapixel (0.25 and 0.5 megapixels are billed as one) plus $0.001 per reference image. A 1-megapixel image from a text prompt costs $0.001; the maximum, five references at 4 megapixels, is $0.009.
How do I call FLUX.2 [klein] 4B?: It runs on Hormouz's asynchronous predictions API: submit a prediction with your prompt, then poll until the image is ready. Point your base URL at Hormouz and use a Hormouz API key.
Can FLUX.2 [klein] 4B edit images?: Yes. Send up to five images in the images field and describe the change in the prompt. Use aspect_ratio match_input_image to keep the shape of the first image. Each reference image adds $0.001.
What output sizes does it support?: Set output_megapixels to 0.25, 0.5, 1, 2 or 4 (default 1), with an aspect_ratio from 1:1 to 21:9 in either orientation. Output format can be jpg (default), png or webp.
How do I access FLUX.2 [klein] 4B from inside Iran?: Hormouz serves it from inside Iran over a stable connection. You pay in Iranian rial through the dashboard, with no foreign card or circumvention tooling needed.

Updated 2026-10-13