FLUX 3 Image Klein API
FLUX 3 Image Klein from $0.02 per image — open-weights FLUX 3 generation and editing, no GPU to rent.
The open-weights FLUX 3 tier. Low-cost text-to-image and reference editing that keeps characters and subjects consistent — from $0.02 per image.
No credit card required. Takes 30 seconds.
FLUX 3 Image Klein API pricing
Pay per request from your YepAPI balance — no subscription, no monthly minimum. Prices updated October 23, 2026.
| Billing | Price |
|---|---|
| Rate | $0.02/image |
| What it costs | Per job |
|---|---|
| 1 imagefrom default size | $0.02 |
| 100 imagesa product catalog batch | $2.00 |
| 1,000 imagesa month of app traffic | $20.00 |
2,400+
Developers
1.2M+
API calls served
100+
Endpoints
$0.01
Per call
Yep, that's it.
Try it live
Enter a prompt and generate an image with FLUX 3 Image Klein.
Drop image or click to upload
For image-to-image editing
FLUX 3 Image Klein specs
| Provider | Black Forest Labs |
|---|---|
| Model ID | black-forest-labs/flux-3-image-klein |
| Endpoint | /v1/media/queue |
| Type | Image Generation |
| Output formats | jpeg |
| Image input | Yes |
How to get a FLUX 3 Image Klein API key
- 1
Create a free account
Sign up at yepapi.com with Google or email. It takes about 30 seconds and needs no card.
- 2
Create an API key
Open the dashboard, go to API Keys and create a key. Copy it — it starts with yep_sk_.
- 3
Call FLUX 3 Image Klein
Send a request to /v1/media/queue with the x-api-key header and model "black-forest-labs/flux-3-image-klein".
- 4
Pay as you go
Usage is billed per request from your balance. Top up any amount; there is no subscription.
Strengths
FLUX 3 Image Klein is the open-weights member of the FLUX 3 family.
Suited to reference-based editing that keeps characters and subjects consistent across a set of images.
The lowest-priced FLUX 3 tier, practical for drafts and high-volume generation.
Prompts move to the flagship FLUX 3 Image model when a draft needs a final render.
Quick start
Copy this snippet and start making calls with FLUX 3 Image Klein.
// Step 1: Submit job
const res = await fetch('https://api.yepapi.com/v1/media/queue', {
method: 'POST',
headers: {
'x-api-key': 'YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"model": "black-forest-labs/flux-3-image-klein",
"prompt": "A red fox in a knitted scarf reading a map on a mossy tree stump, children's book illustration, soft watercolor textures, warm autumn palette",
"options": {
"aspectRatio": "1:1"
}
}),
});
const { data } = await res.json();
const jobId = data.jobId;
// Step 2: Poll for result
const status = await fetch(`https://api.yepapi.com/v1/media/status/${jobId}`, {
headers: { 'x-api-key': 'YOUR_API_KEY' },
});
const { data: job } = await status.json();
// job.status: "pending" | "processing" | "completed" | "failed"
// job.result: { text?, image?, audio?, video? }FLUX 3 Image Klein vs similar models
Every model below runs on the same API key — switch by changing the model ID.
| Model | Provider | Price |
|---|---|---|
| FLUX 3 Image Klein | Black Forest Labs | from $0.02/image |
| FLUX.2 Klein | Black Forest Labs | from $0.03/image |
| FLUX.2 Pro | Black Forest Labs | from $0.07/image |
| FLUX.2 Flex | Black Forest Labs | from $0.11/image |
| FLUX 3 Image | Black Forest Labs | from $0.11/image |
| FLUX.2 Max | Black Forest Labs | from $0.15/image |
| GPT Image 2 | OpenAI | from $0.02/image |
| GPT Image 1 Mini | OpenAI | from $0.02/image |
Why use FLUX 3 Image Klein through YepAPI?
FLUX 3 Image Klein API — open-weights FLUX 3 from $0.02
FLUX 3 Image Klein is an open-weights image generation and editing model from Black Forest Labs. It is suited to text-to-image work and to reference-based editing that keeps characters and subjects consistent across images.
On YepAPI you call it on `/v1/media/queue` at about $0.02 per image, with JPEG output by default — no self-hosting, no GPU provisioning, and the same key as the rest of the catalog.
Start generating in 30 seconds
$5 free credit on signup. No credit card required. Pay per call.
What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
The open-weights FLUX 3 tier. Low-cost text-to-image and reference editing that keeps characters and subjects consistent — from $0.02 per image.
FLUX 3 Image Klein costs from $0.02/image through YepAPI, billed per request with no monthly fee. For example, a 1 image (from default size) costs about $0.02.
Sign up at yepapi.com (Google or email, about 30 seconds), open the dashboard and create an API key. The same key works for FLUX 3 Image Klein and every other model — no separate Black Forest Labs account or waitlist.
New YepAPI accounts in most countries get free signup credit, enough to test FLUX 3 Image Klein without a card. After that you pay per request at the rates above — there is no subscription.
Use "black-forest-labs/flux-3-image-klein" as the model on /v1/media/queue. The short alias "flux-3-klein" also works.
Ready to use FLUX 3 Image Klein?
$5 free credit on signup. No credit card required. Pay per call.
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