Black Forest LabsimageOperational

FLUX.2 [flex] API

FLUX.2 with adjustable steps and guidance — best for text and fine detail

bfl/flux-2-flex/text-to-image

FromUp to −12%

$0.044/img$0.05

per image · 1 MP

Open in Studio API

Try FLUX.2 [flex]

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.

Resolution

Output size in megapixels (1 MP ≈ 1024×1024). FLUX.2 is billed per megapixel.

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.2 [flex]?

FLUX.2 [flex] lets you tune sampling steps and guidance for the best typography and fine detail, up to 4 megapixels.

Steps & guidance

Tune quality vs speed

Typography

Strong text rendering

Up to 4 MP

1–4 megapixel output

Per-MP pricing

Pay for the size you need

You control the trade-off

Raise steps for the finest detail and crisp typography, or lower them for quick drafts; adjust guidance to follow the prompt more or less strictly.

FLUX.2 [flex] pricing

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

Tier	Official price	Cheaper Gen.	You save
1 MP ≈1024×1024	~~$0.05~~/img	$0.044/img	−12%
2 MP	~~$0.10~~/img	$0.088/img	−12%
3 MP	~~$0.15~~/img	$0.132/img	−12%
4 MP ≈2048×2048	~~$0.20~~/img	$0.176/img	−12%

Official price: BFL API list price for FLUX.2 [flex] ($0.05 per megapixel of output and of input images). Prices verified 2026-10-16.
Text-to-image only for now — use FLUX 3 or Kontext for editing.

Specifications

Resolutions: 1 · 2 · 3 · 4 MP
Steps: 1–50
Guidance: 1.5–10
Released: Nov 25, 2025

Use FLUX.2 [flex] 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-2-flex/text-to-image", headers=headers, json={
    "prompt": "Editorial photo of a ceramic vase with dried flowers on a linen-covered table, soft north light, film grain",
    "aspect_ratio": "1:1",
    "resolution": "1MP"
}).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-2-flex/text-to-image`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "Editorial photo of a ceramic vase with dried flowers on a linen-covered table, soft north light, film grain",
    "aspect_ratio": "1:1",
    "resolution": "1MP"
  }),
}).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-2-flex/text-to-image \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "Editorial photo of a ceramic vase with dried flowers on a linen-covered table, soft north light, film grain",
  "aspect_ratio": "1:1",
  "resolution": "1MP"
}'

Text to Image

bfl/flux-2-flex/text-to-image

Example prompts

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

Vintage travel poster for “KYOTO”, Mt. Fuji at dawn, bold serif lettering, screen-print texture
Try it
Packaging mockup of a tea tin labeled “MORNING MIST — Green Tea”, studio photo
Try it

FLUX.2 [flex] FAQ

FLUX.2 [flex] is billed per image by output megapixels, like Black Forest Labs' own API: a price for the first megapixel and a price for each additional one. Failed generations are not charged.

Yes. Requests run on Black Forest Labs' FLUX.2 [flex] 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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