How much does Flux 3 Image Klein cost on varg?

Flux 3 Image Klein costs from $0.01 per run on varg (from $0.01/image on the cheapest route). varg charges the provider's price with no markup, from one credit balance. For the exact price of a request before you run it, send the same body to POST https://api.varg.ai/v2/estimate.

How do I call the Flux 3 Image Klein API?

Send POST https://api.varg.ai/v2/tools/image/call with the header "Authorization: Bearer $VARG_API_KEY" and a JSON body that includes "model": "flux_3_image_klein". The call answers 202 with a job right away. Poll GET https://api.varg.ai/v2/jobs/{id} until "status" is "completed", then read output.outputs[0].url, or pass options.webhook_url to be called back.

Can I use Flux 3 Image Klein from Claude, ChatGPT or Cursor?

Yes. Add the varg MCP server (https://mcp.varg.ai/mcp) to Claude, ChatGPT, Cursor or any other MCP client and sign in with varg, with no API key to paste. The agent runs Flux 3 Image Klein with call_tool, passing tool "image" and "model": "flux_3_image_klein".

How long does a Flux 3 Image Klein request take?

Typically about 5 s on the fastest route, by the catalog's estimate. The API answers at once with a job id, so nothing waits on an open connection while it runs.

Images · Text to image · Image to image

Flux 3 Image Klein API

Black Forest Labs FLUX 3 Image Klein. Compact open-weights FLUX 3 Image (5.6B): native 4K, bounding-box layout, edits with up to 10 references.

Price: From $0.01 per run from $0.01/image
Typical time: ~5 s
Model id: flux_3_image_klein

Flux 3 Image Klein runs on one varg API key and one credit balance, the same as every other model here. You pay the provider's price, with no markup.

POST /v2/tools/image/call

curl -X POST https://api.varg.ai/v2/tools/image/call \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux_3_image_klein",
  "prompt": "A woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds."
}'

Try it in the Playground Get an API key

Real outputA woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds.

Flux 3 Image Klein pricing

From $0.01 per run. Prices are in US dollars and are the provider's own, with no markup. Flux 3 Image Klein has 3 routes: "model": "flux_3_image_klein" picks one automatically, or pass a route key as "model" to pin it. For the exact price of a request, send the same body to POST https://api.varg.ai/v2/estimate.

fal from $0.01/image
fal:blackforestlabs/flux-3/klein/text-to-image
Text to image FLUX 3 Image Klein text-to-image (via fal) — compact open-weights FLUX 3 Image. 5.6B params, native 4K, bounding-box layout, prompt expansion on by default.
Image size square_hd
$0.01/image
Image size square
$0.01/image
Image size portrait_4_3
$0.01/image
Image size portrait_16_9
$0.01/image
Image size landscape_4_3
$0.01/image
Image size landscape_16_9
$0.01/image
Other
$0.01/image
Minimum charge
$0.01
Most one request can cost
$0.04
Typical time
~5 s
fal from $0.01/image
fal:blackforestlabs/flux-3/klein/edit-image
Image to image FLUX 3 Image Klein edit (via fal) — edits and composes up to 10 references with bounding-box layout control. Compact open-weights, prompt expansion on by default.
Image size square_hd
$0.01/image
Image size square
$0.01/image
Image size portrait_4_3
$0.01/image
Image size portrait_16_9
$0.01/image
Image size landscape_4_3
$0.01/image
Image size landscape_16_9
$0.01/image
Other
$0.01/image
Minimum charge
$0.01
Most one request can cost
$0.04
Typical time
~5 s
bfl from $0.01/image
bfl:flux-3-image-klein
Text to image, Image to image FLUX 3 Image Klein (direct BFL) — compact open-weights FLUX 3 Image. Single endpoint for text-to-image and editing with up to 10 references. 5.6B params, native 4K, bounding-box layout. Poll-only.
Resolution 768sq
$0.01/image
Resolution 1k
$0.01/image
Resolution 1.5k
$0.02/image
Resolution 2k
$0.02/image
Resolution 4k
$0.04/image
Other
$0.01/image
Minimum charge
$0.01
Most one request can cost
$0.04
Typical time
~5 s

Flux 3 Image Klein inputs

The JSON body of the request. Media inputs are URLs: upload a local file with POST /v2/files and pass the URL it returns. Full JSON Schema, no key needed: api.varg.ai/v2/tools/image?model=flux_3_image_klein

Flux 3 Image Klein request fields
Field	What it does
`model` string required	`flux_3_image_klein` picks a route automatically. To pin one, pass a route key from Pricing above.
`prompt` string	—
`files` array of { url }	—
`aspect_ratio` string	Allowed e.g. 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4 \| 21:9 \| auto

Provider options

Optional, under provider_options.<provider>. Only the options of the provider that runs the job apply; pin a route to choose it.

`provider_options.fal`

Flux 3 Image Klein options for fal
Field	What it does
`prompt` string	The prompt to generate an image from. The model is trained on detailed captions: describe framing, subject, background and lighting.
`image_urls` array of URL strings	—
`seed` integer	The same seed and the same prompt given to the same version of the model will output the same image every time. Allowed -9007199254740991–9007199254740991
`sync_mode` boolean	If True, the media will be returned as a data URI and the output data won't be available in the request history.
`num_images` integer	The number of images to generate. Allowed -9007199254740991–9007199254740991
`output_format` string	Allowed jpeg \| png \| webp
`enable_safety_checker` boolean	If set to true, the safety checker will be enabled.
`enable_prompt_expansion` boolean	If set to true, the prompt is expanded into a detailed caption before generation.

`provider_options.bfl`

Flux 3 Image Klein options for bfl
Field	What it does
`prompt` string	Free-form prompt describing the image.
`seed` integer	Allowed 0–4294967295
`steps` integer	Allowed 1–16
`width` integer	Allowed -9007199254740991–9007199254740991
`height` integer	Allowed -9007199254740991–9007199254740991
`images` string	—
`resolution` string	Allowed 768sq \| 1k \| 1.5k \| 2k \| 4k
`aspect_ratio` string	Allowed 21:9 \| 2:1 \| 16:9 \| 3:2 \| 7:5 \| 4:3 \| 5:4 \| 1:1 \| 4:5 \| 3:4 \| 5:7 \| 2:3 \| 9:16 \| 1:2 \| 9:21
`output_format` string	Allowed jpeg \| png
`safety_tolerance` integer	Harm moderation tolerance from 0 (strictest) to 7. Allowed 0–7

Call the Flux 3 Image Klein API

POST https://api.varg.ai/v2/tools/image/call with Authorization: Bearer $VARG_API_KEY. It answers 202 with a job right away.

1. Send the request

cURL

curl -X POST https://api.varg.ai/v2/tools/image/call \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux_3_image_klein",
  "prompt": "A woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds."
}'

JavaScript

const headers = {
  Authorization: `Bearer ${process.env.VARG_API_KEY}`,
  'Content-Type': 'application/json',
}

const res = await fetch('https://api.varg.ai/v2/tools/image/call', {
  method: 'POST',
  headers,
  body: JSON.stringify({
    "model": "flux_3_image_klein",
    "prompt": "A woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds."
  }),
})
const job = await res.json() // { id: "job_…", status: "queued" }

Python

import os
import requests

headers = {"Authorization": f"Bearer {os.environ['VARG_API_KEY']}"}

job = requests.post(
    "https://api.varg.ai/v2/tools/image/call",
    headers=headers,
    json={
      "model": "flux_3_image_klein",
      "prompt": "A woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds."
    },
).json()  # {"id": "job_…", "status": "queued"}

2. Get the result

Poll the job until its status is completed, failed or cancelled; Flux 3 Image Klein typically takes about 5 s. The result is at output.outputs[0].url.

GET /v2/jobs/{id}

curl https://api.varg.ai/v2/jobs/$JOB_ID \
  -H "Authorization: Bearer $VARG_API_KEY"

# Poll until "status" is completed, failed or cancelled.
# The result is in output.outputs[0].url

JavaScript

let current = job
while (!['completed', 'failed', 'cancelled'].includes(current.status)) {
  await new Promise((resolve) => setTimeout(resolve, 3000))
  current = await (await fetch(`https://api.varg.ai/v2/jobs/${current.id}`, { headers })).json()
}
console.log(current.output?.outputs?.[0]?.url)

Python

import time

while job["status"] not in ("completed", "failed", "cancelled"):
    time.sleep(3)
    job = requests.get(f"https://api.varg.ai/v2/jobs/{job['id']}", headers=headers).json()

print(job["output"]["outputs"][0]["url"])

Or take a webhook instead of polling

Add options.webhook_url and varg POSTs the finished job to it.

request body

{
  "model": "flux_3_image_klein",
  "prompt": "A woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds.",
  "options": {
    "webhook_url": "https://your-app.com/varg-webhook"
  }
}

From Claude, ChatGPT or Cursor (MCP)

The varg MCP server, https://mcp.varg.ai/mcp, runs Flux 3 Image Klein with call_tool. Sign in with varg, no API key to paste. How to connect it

call_tool

{
  "tool": "image",
  "input": {
    "model": "flux_3_image_klein",
    "prompt": "A woman in black with glowing orange shield sunglasses holds a glass Klein bottle, black-and-white concrete room, orange light through window blinds."
  },
  "wait": true
}