CheaperGen
Black Forest LabsTutorial

How to Use FLUX.2 [flex]

Make an FLUX.2 [flex] image in the CheaperGen Studio — no code, no install, no Black Forest Labs account. Pick a mode, write one clear prompt, set the size and press Generate. A test costs $0.046; developers can follow the API tutorial instead.

Modes
1
Text → Image
Test image
$0.046
1 MP
Sizes
up to 4 MP
4 options
Failed runs
$0
refunded automatically
Create with FLUX.2 [flex]Get API keyAPI docs

Prompt builder

Build a FLUX.2 [flex] prompt

Fill in the parts of the shot; the prompt assembles itself. Send it to the playground below and run it — the steps after it explain each part.

Your FLUX.2 [flex] prompt

Fill in a few boxes — or start from the example — and the prompt appears here.

Try it

Try FLUX.2 [flex] here

Runs on your balance at the price on the button; failed runs are refunded. Results are saved to your account.

Open the full-screen Studio

Before you start

Which FLUX.2 [flex] mode to use

FLUX.2 [flex] has 1 mode. Pick by what you already have.

FLUX.2 [flex] modes
ModeYou give itBest forFrom
Text → ImageA promptImages from a description: concepts, illustrations, ad visuals.$0.046/image

Step by step

How to use FLUX.2 [flex] in 6 steps

  1. 1

    Open FLUX.2 [flex] in the Studio

    Open the Studio (it opens with FLUX.2 [flex] selected), or choose the Image tab and pick FLUX.2 [flex] in the model menu. Sign in with Google or your email; you pay per generation from prepaid credits.

  2. 2

    Choose what to make

    • Text → Image — a prompt.
  3. 3

    Write the prompt

    One shot per prompt works best. Cover these, in plain sentences:

    • Subject. The main subject and its key details: material, colour, expression, product features.
    • Composition. Framing and angle: close-up, flat lay, three-quarter view, rule of thirds, negative space.
    • Setting and light. Background, environment and lighting: studio softbox, golden hour, neon.
    • Style. Photo, illustration, 3D render or painting — plus lens or medium details.

    More structure and examples: the FLUX.2 [flex] prompt guide.

  4. 4

    Set the options

    The settings sit under the prompt; rarely needed ones are behind ⋯. What each does — and to the price — is in the table below.

  5. 5

    Generate

    The exact price is shown before you run: press Generate (or ⌘/Ctrl + Enter). The amount is held from your balance and refunded in full if the generation fails.

  6. 6

    Download and iterate

    Results appear above the prompt; download them from there. Change one thing per try — the prompt, the composition or a setting — so you know what helped. Compare runs the same prompt on several models side by side, and Code shows the same request for the API.

Settings

FLUX.2 [flex] settings explained

For Text → Image. Prices are per image.

FLUX.2 [flex] settings
SettingChoicesDefaultWhat it doesPrice
Aspect ratio1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9, 9:211:1Output image shape.Changes the price
Resolution1 MP, 2 MP, 3 MP, 4 MP1 MPOutput size in megapixels (1 MP ≈ 1024×1024). FLUX.2 is billed per megapixel.$0.046–$0.1364/image
Steps(⋯)1–5050Sampling steps. More steps add detail and take longer (same price).No effect on the price
Guidance(⋯)1.5–105How closely the image follows the prompt (1.5–10).No effect on the price
Prompt upsampling(⋯)On / offOffLet the model expand and rewrite the prompt before generating.No effect on the price
Seed(⋯)Free text—Use the same seed and settings to reproduce a result. Leave empty for random.No effect on the price

Every tier and a calculator: FLUX.2 [flex] API Pricing.

Worked example

A first prompt to try

Text → Image with the default settings. Paste it into the Studio and change one thing at a time.

“Vintage travel poster for “KYOTO”, Mt. Fuji at dawn, bold serif lettering, screen-print texture”

Aspect ratio: 1:1 · Resolution: 1 MP

$0.046$0.05 for this image

Try it in the Studio

Avoid these

Common FLUX.2 [flex] mistakes

Drafting at 4 MP

Every try at 4 MP costs 3.0× one at 1 MP. Settle the composition and motion at 1 MP, then render the keeper at the size you deliver.

Describing what you don't want

Prompts work better when they describe what should be on screen. "No blur" or "no extra fingers" can pull the result towards the very thing you name.

FAQ

How to use FLUX.2 [flex]: questions

Yes. Open it in the CheaperGen Studio, pick a mode, write a prompt and press Generate. No code, no install and no Black Forest Labs account.

There is no free tier, and no subscription is needed either: you pay per image, from $0.046 for a 1 MP image — up to 32% below the official price. Credits are prepaid and failed generations are refunded. Every price is on the [FLUX.2 [flex] pricing](/models/bfl/flux-2-flex/pricing) page.

Write one clear shot per prompt — subject, action, setting, camera and light — and change one thing per try. The [FLUX.2 [flex] prompt guide](/models/bfl/flux-2-flex/prompt-guide) has a structure and examples that work.

Yes. The same model and price are on the API — see [how to use the FLUX.2 [flex] API](/models/bfl/flux-2-flex/how-to-use-api) — and on our MCP server, so agents like Claude can generate for you (MCP setup).

Nothing is charged. The price is held when you press Generate and refunded in full if the generation fails or you cancel it while it is queued.

It depends on quality, speed and price; the FLUX API page compares all 9 side by side.

FLUX.2 [flex] is developed by Black Forest Labs. CheaperGen provides API access and does not own the model. Trademarks belong to their respective owners.