AI image API · Black Forest Labs
FLUX 3 Klein API pricing per image
Generate images with Black Forest Labs's FLUX 3 Klein 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$0.0845per imageR$0.28 · 5 credits10 images: $0.84Updated November 07, 2026
Pricing
FLUX 3 Klein pricing by mode and resolution
| Mode | Resolution | Price per image | In reais | Credits |
|---|---|---|---|---|
| Text only | 2k | $0.0845 | R$0.28 | 5 credits |
| With references | 2k | $0.0845 | R$0.28 | 5 credits |
Updated November 07, 2026. Prices use the cheapest credit pack: 1 credit costs $0.0179 (R$0.0599).
Limits
What FLUX 3 Klein accepts in each request
- Modes
- Text only and With references
- Resolutions
- 2k
- Aspect ratios
- 21:9, 16:9, 3:2, 4:3, 1:1, 3:4, 2:3, 9:16
- Reference images
- up to 8
Code
How to call FLUX 3 Klein free quote, generation and result
BODY='{"model":"bfl/flux-3-klein","prompt":"product photo of a white sneaker on a studio background"}'
CREDITS=$(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-3-klein",
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-3-klein",
"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 2k, each image costs $0.0845 and 10 images come to $0.84 (R$2.83, 48 credits).
- Create an account, make a key and send the request to the quote, which charges nothing. The 15 free credits cover 3 images with FLUX 3 Klein.
- Text only: the prompt describes everything. With references: up to 8 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 3 Klein and every other model with the same key.
- No. The Cut.Pro key calls FLUX 3 Klein 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
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Generate with FLUX 3 Klein today
Create a key, get a free quote and pay only for what you generate.
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