Black Forest LabsAPI cost

FLUX.2 [klein] 4B API Cost

A 1K FLUX.2 [klein] 4B image costs $0.001, against $0.014 at the official price. What you spend depends on image size, how many images you make and how many you keep — here is what real work costs, what a monthly budget buys and how to spend less.

1K image: $0.001; official $0.014
1,000 images: $0.95; 1K
1,000 images / month: $0.95; 1K
Below official: up to 93%; failed runs: $0

Create with FLUX.2 [klein] 4B Get API key API docs

Try it

Try FLUX.2 [klein] 4B — the price is on the button

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

Calculator

Calculate your FLUX.2 [klein] 4B cost

Pick the size, your monthly volume and how many tries you keep. Every figure is a live quote.

Size

Images you keep per month 100

Tries per keeper

Per month · 100 generations

0.095

~~$1.41~~ at the official price

Per image: 0.001
Per kept image: 0.001
Saved per month: $1.31
Saved per year: $15.72

Live prices · failed generations are free

Cost drivers

What drives the FLUX.2 [klein] 4B API cost

3 things set your bill. Prices are live; the full tier list is on the FLUX.2 [klein] 4B API pricing page.

Image size

The biggest lever. An image costs 4.0× as much at 2K as at 1K.

1K: $0.001; 1.0×
2K: $0.004; 4.0×

Task

Text to Image from $0.001/image, Image Edit from $0.0013/image.

Takes you keep

Every successful image is billed, including takes you discard. Keeping one in three makes each kept 1K image cost $0.003 instead of $0.001. Failed generations are refunded.

Real work

What images cost with FLUX.2 [klein] 4B

Typical jobs priced end to end at today's per-image prices.

FLUX.2 [klein] 4B cost of common deliverables
Deliverable	Generations	Tier	Official	CheaperGen
Concept exploration	20 images	1K	~~$0.28~~	$0.019 With a monthly plan: Max $0.018
Product photo set	12 images	1K	~~$0.17~~	$0.012 With a monthly plan: Max $0.011
Ad creative variations	50 images	1K	~~$0.70~~	$0.048 With a monthly plan: Pro $0.047Max $0.045
Blog illustrations for a month	100 images	1K	~~$1.40~~	$0.095 With a monthly plan: Pro $0.093Max $0.09
Catalog of 1,000 products × 3 shots	3,000 images	1K	~~$42.15~~	$2.85 With a monthly plan: Pro $2.78Max $2.70
Hero images	4 images	2K	~~$0.069~~	$0.016 With a monthly plan: Max $0.015

Monthly plans lower prices on most models (shown under each price); you can still pay as you go. Pro $499/month · Max $4,999/month.

Budgets

What a FLUX.2 [klein] 4B budget buys

Images per budget at each size.

FLUX.2 [klein] 4B: output per budget
Size	$10	$50	$100	$500	$1,000
1K $0.001 per image	10,526	52,631	105,263	526,315	1,052,631
2K $0.004 per image	2,631	13,157	26,315	131,578	263,157

Yearly difference

FLUX.2 [klein] 4B cost vs the official price

The same monthly volume at 1K, priced here and at the official price (verified October 18, 2026).

1,000 images / month

$0.95

~~$14.05~~ official

$157.18 less a year

10,000 images / month

$9.50

~~$140.49~~ official

$1,572 less a year

100,000 images / month

$95.00

~~$1,405~~ official

$15,718 less a year

Compare

A 1K image on other models

The same request on FLUX models and the cheapest similar models, at each model's lowest price for that size.

Cost of the same request on FLUX.2 [klein] 4B and other models
Model	Tier	Cost	vs. FLUX.2 [klein] 4B
FLUX.2 [klein] 4B Black Forest Labs	1K	$0.001	—
FLUX 3 Image Klein FLUX family	1K	$0.002	+99%
Z-Image Turbo Alibaba	1K	$0.005	+397%
GPT Image 2.5 OpenAI	1K · low	$0.007	+538%
GPT Image 2.5 Flare OpenAI	1K · low	$0.007	+538%
Seedream 5.0 Flash ByteDance	1K	$0.016	+1520%
FLUX.2 [pro] FLUX family	1 MP	$0.028	+2805%
FLUX 3 FLUX family	1K	$0.032	+3237%
FLUX.1 Kontext [pro] FLUX family	Image	$0.035	+3557%
FLUX.2 [flex] FLUX family	1 MP	$0.046	+4742%
FLUX.2 [max] FLUX family	1 MP	$0.065	+6679%
FLUX.1 Kontext [max] FLUX family	Image	$0.07	+7213%

Price is one input; quality, speed and features differ. Each model's cost page has its own breakdown.

Cost control

Keep FLUX.2 [klein] 4B spend predictable

The same rules in the API, the Playground and the Studio. Details in the billing docs.

Price it first. POST /v1/quote/bfl/flux-2-klein-4b/text-to-image returns the exact price of any request, free.
Cap a request. Send max_cost_usd and a request priced above it is refused without charge.
Prepaid only. You can't spend more than your balance; auto top-up is optional and you set its amount.
Failed = free. Failed generations, and jobs you cancel while queued, are refunded in full.
Every charge itemized. Each generation returns its exact cost, and the dashboard lists every charge.

FAQ

FLUX.2 [klein] 4B API cost questions

FLUX.2 [klein] 4B API Pricing

FLUX.2 [klein] 4B API Pricing Per Image

Cheapest FLUX.2 [klein] 4B API

A 1K image costs $0.001 (official $0.014). Prices run from $0.001 to $0.0038 per image depending on size, with no subscription needed and no minimum spend.

It depends only on usage. 1,000 images a month cost $0.95; 10,000 images a month cost $9.50; 100,000 images a month cost $95.00 (at 1K). At the middle volume that is $1,572 a year less than at the official price.

Image size and task. The quote endpoint (POST /v1/quote/{endpoint}) prices any request for free before you run it. Rates by size: price per image.

You pay for every successful generation, including takes you decide not to use. Failed generations, and jobs you cancel while they are queued, are refunded in full automatically. To spend less per try, see [Cheapest FLUX.2 [klein] 4B](/models/bfl/flux-2-klein-4b/cheapest).

Yes. Credits are prepaid, so you can't spend more than your balance. Pass max_cost_usd with a request and it is refused, without charge, if its price would be higher. Auto top-up is optional.

Our prices are live; official prices were verified October 18, 2026. FLUX.2 [klein] 4B is Black Forest Labs' open-weights model. CheaperGen provides API access to the open weights, run on GPU inference for open-source models, and does not own the model. Trademarks belong to their respective owners.