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Flux 3 Klein API — how to connect and pay

Name: Flux 3 Klein API — GetVibe API
Brand: GetVibe API
Price: 0.010667 USD
Availability: InStock

FLUX 3 Klein — the most affordable model of Black Forest Labs' FLUX 3 family (October 2026): text-to-image and editing from reference images (up to 10). 1K (~1 MP), 2K (~4 MP) or 4K (up to 16 MP). Priced per image by output size; reference images do not change the price.

Channel comparison

last 7 days

Channel

Pixelflux-3-kleindefaultcheapest

Price

from $0.010667 per image

Channel

Flowflux-3-klein:flow

Price

from $0.012 per image

Channel	Price
Pixel`flux-3-klein`defaultcheapest	from $0.010667 per image
Flow`flux-3-klein:flow`	from $0.012 per image

Build the result you need

flux-3-klein

Resolution

Input: Text, ImageSome modes require you to attach: source image, seed for reproducibility

Get API key

What is Flux 3 Klein

Contract at a glance

Input: text, image
Output: image
Mode: async (job + polling)
Status polling: every 3 s · up to 90 s

Strengths

Pricing: per image
Inputs: text, image
3 configurable options
One API key for media generation

Where it is used

Article and social media illustrations
Product images
Banners and covers
Design prototypes

Example request

Pass your key in the Bearer header. The API returns jobId for polling the status.

curl -sS https://getvibeapi.com/api/media/generate \
  -H "Authorization: Bearer $GETVIBE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary '{"model":"flux-3-klein","prompt":"a beautiful landscape","opts":{"resolution":"1K","aspect_ratio":"1:1","output_format":"png","enable_prompt_expansion":true}}'

JavaScript

const response = await fetch('https://getvibeapi.com/api/media/generate', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.GETVIBE_API_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "model": "flux-3-klein",
  "prompt": "a beautiful landscape",
  "opts": {
    "resolution": "1K",
    "aspect_ratio": "1:1",
    "output_format": "png",
    "enable_prompt_expansion": true
  }
}),
});

if (!response.ok) throw new Error(`GetVibe API: ${response.status}`);
const { jobId } = await response.json();
console.log(jobId);

API request parameters

Parameters for requests to Flux 3 Klein via the GetVibe API.

Parameter

promptreq.

Type

text

Values

text description

Default

required

Price

—

Parameter

image_url

Type

URL

Values

Public image URL

Default

—

Price

—

Parameter

resolution

Type

option selection

Values

1K (~1 MP) (default) · 2K (~4 MP) · 4K (up to 16 MP)

Default

1K (~1 MP)

Price

1K (~1 MP): $0.010667, 2K (~4 MP): $0.016667, 4K (up to 16 MP): $0.043333

Parameter

aspect_ratio

Type

option selection

Values

1:1 (default) · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 · 2:3 · 21:9 · 9:21 · Auto (as the source)

Default

1:1

Price

Included in the base price

Parameter

output_format

Type

option selection

Values

PNG (default) · JPEG · WebP

Default

PNG

Price

Included in the base price

Parameter

enable_prompt_expansion

Type

yes/no

Values

Yes (default) · No

Default

Yes

Price

Included in the base price

Parameter

seed

Type

text / number

Values

any value

Default

—

Price

Included in the base price

Parameter

input_urls

Type

Array<URLs>, 0–10 items

Values

Public HTTP(S) URLs

Default

—

Price

Included in the base price

Parameter

image_file_id

Type

text

Values

Alternative to image_url: the id of your own file from POST /v1/files (file-pv-…)

Default

—

Price

Included in the base price

Parameter

image_base64

Type

text

Values

Alternative to image_url: the file inline, as base64 or a data: URI

Default

—

Price

Included in the base price

Parameter

input_file_ids

Type

Array<strings>

Values

List of values

Default

—

Price

Included in the base price

Parameter

input_base64

Type

Array<strings>

Values

List of values

Default

—

Price

Included in the base price

Parameter	Type	Values	Default	Price
`prompt`req.	text	text description	required	—
`image_url`	URL	Public image URL	—	—
`resolution`	option selection	1K (~1 MP) (default) · 2K (~4 MP) · 4K (up to 16 MP)	1K (~1 MP)	1K (~1 MP): $0.010667, 2K (~4 MP): $0.016667, 4K (up to 16 MP): $0.043333
`aspect_ratio`	option selection	1:1 (default) · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 · 2:3 · 21:9 · 9:21 · Auto (as the source)	1:1	Included in the base price
`output_format`	option selection	PNG (default) · JPEG · WebP	PNG	Included in the base price
`enable_prompt_expansion`	yes/no	Yes (default) · No	Yes	Included in the base price
`seed`	text / number	any value	—	Included in the base price
`input_urls`	Array<URLs>, 0–10 items	Public HTTP(S) URLs	—	Included in the base price
`image_file_id`	text	Alternative to image_url: the id of your own file from POST /v1/files (file-pv-…)	—	Included in the base price
`image_base64`	text	Alternative to image_url: the file inline, as base64 or a data: URI	—	Included in the base price
`input_file_ids`	Array<strings>	List of values	—	Included in the base price
`input_base64`	Array<strings>	List of values	—	Included in the base price

Request: POST https://getvibeapi.com/api/media/generate. Prices in USD.

Price of Flux 3 Klein

The cost of Flux 3 Klein: from $0.010667 per image. The price is calculated dynamically at the current exchange rate, and the final charge is shown in the API response (priceRub). Payment in USD, no subscriptions.

What a default request costs

With no parameters sent, the request uses these values: Resolution — 1K (~1 MP), Frame format — 1:1, Format — PNG, Expand the prompt automatically — Yes. That request costs $0.010667.

Channels and prices for every parameter combination

For every channel, the price of every parameter combination. It is exactly the amount a successful generation is charged, and the same figure as in the machine-readable table linked below.

Pixelflux-3-kleinfrom $0.010667exact prices

Resolution	1K (~1 MP)	2K (~4 MP)	4K (up to 16 MP)
Pixel	$0.010667	$0.016667	$0.043333

Every combination as JSON: /api/media/price-table?model=flux-3-klein

Flowflux-3-klein:flowfrom $0.012exact prices

Aspect ratio \ Resolution	1K (~1 MP)	2K (~4 MP)	4K (up to 16 MP)
1:1	$0.012	$0.048	$0.192
16:9	$0.012	$0.048	$0.108
9:16	$0.012	$0.048	$0.108
4:3	$0.012	$0.048	$0.144
3:4	$0.012	$0.048	$0.144
3:2	$0.012	$0.048	$0.132
2:3	$0.012	$0.048	$0.132

Every combination as JSON: /api/media/price-table?model=flux-3-klein%3Aflow

README

The machine-readable contract for Flux 3 Klein contains the request schema, operations, limits, polling and response examples.

# Flux 3 Klein

Public model: flux-3-klein
Create job: POST /api/media/generate
Check status: GET /api/media/jobs/{jobId}

## Input parameters
- `prompt` (text): text description; default: required
- `image_url` (URL): Public image URL; default: —
- `resolution` (option selection): 1K (~1 MP) (default) · 2K (~4 MP) · 4K (up to 16 MP); default: 1K (~1 MP)
- `aspect_ratio` (option selection): 1:1 (default) · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 · 2:3 · 21:9 · 9:21 · Auto (as the source); default: 1:1
- `output_format` (option selection): PNG (default) · JPEG · WebP; default: PNG
- `enable_prompt_expansion` (yes/no): Yes (default) · No; default: Yes
- `seed` (text / number): any value; default: —
- `input_urls` (Array<URLs>, 0–10 items): Public HTTP(S) URLs; default: —
- `image_file_id` (text): Alternative to image_url: the id of your own file from POST /v1/files (file-pv-…); default: —
- `image_base64` (text): Alternative to image_url: the file inline, as base64 or a data: URI; default: —
- `input_file_ids` (Array<strings>): List of values; default: —
- `input_base64` (Array<strings>): List of values; default: —

## Public variants
- `flux-3-klein`: Pixel
- `flux-3-klein:flow`: Flow

Model JSON contract Media API guide OpenAPI JSON

FAQ about the Flux 3 Klein API

How much does Flux 3 Klein cost?

The price of Flux 3 Klein: from $0.010667 per image. The price is calculated dynamically at the current exchange rate.

Is it compatible with the OpenAI SDK?

Yes, the API is fully OpenAI-compatible. Just change base_url to https://getvibeapi.com/v1 and set your key — the rest of the code stays the same.

Connect Flux 3 Klein right now

Get API key

Flux 3 Klein API — how to connect and pay

Channel comparison

Build the result you need

What is Flux 3 Klein

Contract at a glance

Strengths

Where it is used

API contract

Example request

JavaScript

API request parameters

Price of Flux 3 Klein

Channels and prices for every parameter combination

README

FAQ about the Flux 3 Klein API

Connect Flux 3 Klein right now

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