AI image API · Black Forest Labs
Flux 2 Klein 4b API pricing per image
Generate images with Black Forest Labs's Flux 2 Klein 4b through the Cut.Pro API. You see the price before you generate and pay only for what you use.
- Pay as you go, no subscription
- 15 free credits on a new account
- Free quote before every call
From$0.0208per imageR$0.0696 · 2 credits10 images: $0.21Updated November 07, 2026
Pricing
Flux 2 Klein 4b pricing by mode and resolution
| Mode | Resolution | Price per image | In reais | Credits |
|---|---|---|---|---|
| Text only | 1080p | $0.0208 | R$0.0696 | 2 credits |
| With references | 1080p | $0.0312 | R$0.10 | 2 credits |
Updated November 07, 2026. Prices use the cheapest credit pack: 1 credit costs $0.0179 (R$0.0599).
Limits
What Flux 2 Klein 4b accepts in each request
- Modes
- Text only and With references
- Resolutions
- 1080p
- Reference images
- up to 3
Code
How to call Flux 2 Klein 4b free quote, generation and result
BODY='{"model":"bfl/flux-2-klein-4b","prompt":"product photo of a white sneaker on a studio background"}'
CREDITS=$(curl -s -X POST https://api.cut.pro/api/v1/generations/quote \
-H "X-Api-Key: $CUTPRO_API_KEY" \
-H "Content-Type: application/json" \
-d "$BODY" | jq .credits)
curl -X POST "https://api.cut.pro/api/v1/generations?wait=60" \
-H "X-Api-Key: $CUTPRO_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d "$(jq -c --argjson credits "$CREDITS" '. + {credits: $credits}' <<< "$BODY")"const api = "https://api.cut.pro/api/v1";
const headers = { "X-Api-Key": process.env.CUTPRO_API_KEY, "Content-Type": "application/json" };
const body = {
model: "bfl/flux-2-klein-4b",
prompt: "product photo of a white sneaker on a studio background",
};
const quote = await fetch(`${api}/generations/quote`, { method: "POST", headers, body: JSON.stringify(body) }).then((res) => res.json());
let generation = await fetch(`${api}/generations?wait=60`, {
method: "POST",
headers: { ...headers, "Idempotency-Key": crypto.randomUUID() },
body: JSON.stringify({ ...body, credits: quote.credits }),
}).then((res) => res.json());
while (generation.status === "processing") {
generation = await fetch(`${api}/generations/${generation.id}?wait=60`, { headers }).then((res) => res.json());
}
console.log(generation.output?.url ?? generation.error_code);import os, uuid, requests
API = "https://api.cut.pro/api/v1"
headers = {"X-Api-Key": os.environ["CUTPRO_API_KEY"]}
body = {
"model": "bfl/flux-2-klein-4b",
"prompt": "product photo of a white sneaker on a studio background",
}
quote = requests.post(f"{API}/generations/quote", json=body, headers=headers).json()
generation = requests.post(
f"{API}/generations",
params={"wait": 60},
json={**body, "credits": quote["credits"]},
headers={**headers, "Idempotency-Key": str(uuid.uuid4())},
).json()
while generation["status"] == "processing":
generation = requests.get(f"{API}/generations/{generation['id']}", params={"wait": 60}, headers=headers).json()
print(generation["output"]["url"] if generation["status"] == "ready" else generation["error_code"])Read the docsQuestions
API questions before your first call
- At 1080p, each image costs $0.0208 and 10 images come to $0.21 (R$0.70, 12 credits).
- Create an account, make a key and send the request to the quote, which charges nothing. The 15 free credits cover 12 images with Flux 2 Klein 4b.
- Text only: the prompt describes everything. With references: up to 3 images guide the character, product or style.
- No. Buy a credit pack by card, or in reais with Pix from Brazil, and spend it on Flux 2 Klein 4b and every other model with the same key.
- No. The Cut.Pro key calls Flux 2 Klein 4b without a Black Forest Labs account, with one balance for every model in the catalog.
- Yes. With a CPF or CNPJ and full address in your billing details, the nota fiscal is issued after each payment is confirmed.
Still missing one? Help center
Compare
Other models of the same kind
- Flux Kontext ProBlack Forest Labs · from $0.10 per imageSee price
- Flux 2 FlexBlack Forest Labs · from $0.13 per imageSee price
- Flux 2 ProBlack Forest Labs · from $0.078 per imageSee price
- Flux 1 SrpoBlack Forest Labs · from $0.13 per imageSee price
- Flux Kontext Pro MaxBlack Forest Labs · from $0.21 per imageSee price
- Flux Krea LoraBlack Forest Labs · from $0.19 per imageSee price
Generate with Flux 2 Klein 4b today
Create a key, get a free quote and pay only for what you generate.
Create API key