Black Forest LabsimageOperational

FLUX.1 Kontext [pro] API

Instruction-based image editing that keeps characters consistent (legacy)

bfl/flux-kontext-pro/text-to-image bfl/flux-kontext-pro/edit

FromUp to −12%

$0.035/img$0.04

per image · Image

Open in Studio API

Try FLUX.1 Kontext [pro]

Runs on your balance at the price shown on the button. Results are saved to your account.

Open full-screen Studio

Prompt*

0/5000

Aspect ratio

Output image shape.

Estimated cost…

Create a free account with Google or email — pay only for what you generate.

Your image will appear here

Write a prompt, pick your settings and hit Run. You only pay for successful generations.

What is FLUX.1 Kontext [pro]?

FLUX.1 Kontext [pro] edits images with plain-language instructions — change clothes, scenes, text or style — while keeping people and objects consistent, at a flat price per image. BFL now lists Kontext as a legacy model; FLUX.2 and FLUX 3 are its successors.

Flat price

One price per image

Consistent edits

Faces and objects stay

4 inputs

Combine up to 4 images

Fast

Seconds per edit

Edit with words

Kontext understands the image you give it: ask for a new background, outfit, time of day or style, or replace text on signs, and everything you didn't mention stays put.

FLUX.1 Kontext [pro] pricing

Pay per image. No subscription. Failed generations are refunded automatically.

Tier	Official price	Cheaper Gen.	You save
Image ≈1 MP	~~$0.04~~/img	$0.035/img	−12%

Official price: BFL API list price for FLUX.1 Kontext [pro] ($0.04 per image). Prices verified 2026-10-16.

Specifications

Resolution: ≈1 MP
Aspect ratios: 1:1 · 4:3 · 3:4 · 16:9 · 9:16 · 3:2 · 2:3 · 21:9 · 9:21
Edit inputs: Up to 4 images
Released: May 29, 2025

Use FLUX.1 Kontext [pro] via API

One request to start a job, one to fetch the result. Same shape for every model.

Full API reference

import os, time, requests

API = "https://cheapergen.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['CHEAPERGEN_API_KEY']}"}

# 1. Submit the job
job = requests.post(f"{API}/run/bfl/flux-kontext-pro/text-to-image", headers=headers, json={
    "prompt": "A cozy reading nook with a window seat, rain outside, warm lamplight, illustrated children's-book style",
    "aspect_ratio": "1:1"
}).json()

# 2. Poll until it finishes (or pass "webhook_url" and skip polling)
while job["status"] in ("queued", "running"):
    time.sleep(3)
    job = requests.get(f"{API}/generations/{job['id']}", headers=headers).json()

print(job["status"], job["output"]["images"][0]["url"] if job["status"] == "succeeded" else job["error"])

const API = "https://cheapergen.com/api/v1";
const headers = {
  Authorization: `Bearer ${process.env.CHEAPERGEN_API_KEY}`,
  "Content-Type": "application/json",
};

// 1. Submit the job
let job = await fetch(`${API}/run/bfl/flux-kontext-pro/text-to-image`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A cozy reading nook with a window seat, rain outside, warm lamplight, illustrated children's-book style",
    "aspect_ratio": "1:1"
  }),
}).then((r) => r.json());

// 2. Poll until it finishes (or pass webhook_url and skip polling)
while (job.status === "queued" || job.status === "running") {
  await new Promise((r) => setTimeout(r, 3000));
  job = await fetch(`${API}/generations/${job.id}`, { headers }).then((r) => r.json());
}

console.log(job.status === "succeeded" ? job.output.images[0].url : job.error);

curl -X POST https://cheapergen.com/api/v1/run/bfl/flux-kontext-pro/text-to-image \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "A cozy reading nook with a window seat, rain outside, warm lamplight, illustrated children'\''s-book style",
  "aspect_ratio": "1:1"
}'

Text to Image

bfl/flux-kontext-pro/text-to-image

Image Edit

bfl/flux-kontext-pro/edit

Example prompts

Hit “Try it” to load a prompt into the playground above.

Image Edit
Change the shop sign to read “BLOOM & CO.” in gold serif letters
Try it
Image Edit
Make it a snowy winter evening with warm windows, same composition
Try it

FLUX.1 Kontext [pro] FAQ

FLUX.1 Kontext [pro] is billed at a flat price per image (about 1 megapixel), including input images. Failed generations are not charged.

Yes. Requests run on Black Forest Labs' FLUX.1 Kontext [pro] model through official API channels, at a lower price than the BFL list price.

Yes, outputs of the FLUX API models can be used commercially, subject to Black Forest Labs' terms and our Terms of Service.

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