Black Forest Labs
Operational· checked every few minutes

FLUX 3 Image API

The FLUX 3 Image API: Black Forest Labs' image model for new images and edits at 1K, 2K or 4K, from $0.04 an image, below BFL's price.

Price per image17%off
1K
$0.04$0.048
2K
$0.05$0.10
4K
$0.09$0.607
Get your API keyTry it in the playground
Model IDflux-3-image
generate.py
from openai import OpenAI
client = OpenAI(
    base_url="https://api.zurelay.com/v1",
    api_key="YOUR_ZURELAY_KEY",
)
image = client.images.generate(
    model="flux-3-image",
    prompt="A red fox sitting in fresh snow at dawn, photo",
    size="2K",
    extra_body={"aspect_ratio": "16:9"},
)
print(image.data[0].url)

Base URL https://api.zurelay.com/v1. Works with any OpenAI SDK. FLUX 3 guide

Resolutions
1K · 2K · 4K
Aspect ratios
1:1 to 21:9
Input
Text, Image
Output
Image
Released
Oct 1, 2026
Status
Operational

Examples

Made with FLUX 3 Image. Straight from the API.

Every image here is a single API call with the prompt underneath it, not retouched or upscaled. They're shown as compressed WebP; the API returns full-quality PNG.

Make your own
  • A screen-printed poster for a summer night swim at an outdoor public pool: turquoise water lit from below, a striped diving board, palm silhouettes against a deep violet sky with a few stars. Across the top, the words "NIGHT SWIM" in tall chunky retro capitals; at the bottom, smaller text reading "Lido Pool · Fridays 9 PM to Midnight". Flat colors, visible paper grain.
  • Top-down flat lay photo on a warm beige linen tablecloth: an open sketchbook with a pencil <notebook_1> on the left, a cup of black coffee on a saucer <cup_1> at the upper right, a pair of round tortoiseshell glasses <glasses_1> at the lower right, and a sprig of eucalyptus <plant_1> along the bottom edge. Soft morning window light, gentle shadows, editorial photography. [{"id":"notebook_1","bbox":[150,70,850,480],"desc":"An open spiral sketchbook lying flat, a soft pencil drawing of a mountain range on the right page, a wooden pencil resting across it."},{"id":"cup_1","bbox":[120,590,470,870],"desc":"A matte white ceramic cup of black coffee on a matching saucer, seen from directly above."},{"id":"glasses_1","bbox":[580,560,800,930],"desc":"A pair of round tortoiseshell reading glasses, folded."},{"id":"plant_1","bbox":[860,280,1000,780],"desc":"A single sprig of silver-green eucalyptus lying horizontally."}]
  • A wide cinematic photograph of a lone red cable car crossing between two snowy mountain ridges above a sea of clouds at sunrise, warm golden light on the peaks, the cable glinting, deep blue shadows in the valleys below. Landscape photography, photorealistic.
  • Landscape photograph of a fishing village built on terraced cliffs above a small harbor at blue hour, warm lights glowing in the windows, wooden boats moored on calm water, a stone lighthouse at the end of the pier, low mist over the sea. Long exposure, ultra-detailed, photorealistic.

Pricing

FLUX 3 Image API pricing. A fraction of the list price.

Pay as you go from prepaid credit, with no subscription. Top up from $10. Requests that fail are never billed.

RateZurelayBlack Forest Labs list
1K image
per image
$0.04$0.048
2K image
per image
$0.05$0.10
4K image
per image
$0.09$0.607

Every image is checked against the resolution and aspect ratio you asked for before it's delivered.

Every AI image model and price
Savings calculator

Move the sliders to your monthly usage.

Images per month1,000
Resolution
Zurelay
$40.00
Black Forest Labs list price
$48.00
You save every month$8.00

$96.00 a year

Overview

What is FLUX 3 Image?

FLUX 3 Image is Black Forest Labs' image model for text-to-image and image editing, up to 4K. The Zurelay FLUX 3 Image API makes images for $0.04 at 1K, $0.05 at 2K and $0.09 at 4K, against BFL's $0.048, $0.10 and $0.607, and edits an image you send at the same price.

FLUX 3 Image is the image model in Black Forest Labs' FLUX 3 family, released on October 1, 2026. One model makes new images and edits: the prompt decides which. On Zurelay it uses the model ID flux-3-image, and also accepts black-forest-labs/flux-3-image and bfl/flux-3-image.

BFL prices it per image by resolution: $0.048 at 1K, $0.10 at 2K and $0.607 at 4K. Zurelay charges $0.04, $0.05 and $0.09, and an edit costs the same as a new image.

Send a prompt to POST /v1/images/generations with size 1K, 2K or 4K and an optional aspect_ratio, one of 15 shapes from 21:9 to 9:21: 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 or 9:21. Sizes have the same area at every shape: about one megapixel at 1K, four at 2K (2736 × 1536 for 16:9) and sixteen at 4K (5472 × 3072 for 16:9). A 1K image in a shape other than square can come back at the 2K size, at the 1K price; Zurelay retries any image smaller than asked or in another shape.

To edit, send one image in images, or as a file to /v1/images/edits, and describe the change; without an aspect_ratio, the result keeps the shape of the image you send. FLUX 3 renders legible text, can place things where you ask with layout boxes written into the prompt, and can look up recent facts on the web while it draws.

Strengths

Where FLUX 3 Image shines. And what teams build with it.

01

4K for a fraction of BFL's price

$0.09 for a 16-megapixel image, against BFL's $0.607, and $0.05 at 2K against $0.10.

02

Fifteen shapes

From 21:9 banners and 2:1 headers to 9:16 stories and 9:21 tall posters, with each image's size checked before it's delivered.

03

Text and layout

Words in quotes come out legible, and layout boxes in the prompt put each element where you drew it.

04

Edits that keep the rest

Change a color, an object or the weather and keep everything else in the picture as it was.

Use cases

  • Posters and ad creatives

    Draft promos with the copy in the image, in the exact shape each channel needs.

  • Large prints and hero images

    Make 4K images straight from the model for print, wallpapers and website headers.

  • Controlled compositions

    Place a logo, a product and a headline in set spots with layout boxes.

  • Product and photo edits

    Recolor a product, swap a background or change the season in a photo you already have.

Get started

Call FLUX 3 Image in three steps.

No waitlist and no new SDK. If your code already talks to OpenAI, it already talks to Zurelay.

  1. 1

    Create a key

    Sign up, add credit and create an API key. Set a monthly budget or a rate limit per key if you like.

    Get your API key
  2. 2

    Point your SDK at Zurelay

    Change the base URL. Everything else in your code stays the same.

    https://api.zurelay.com/v1
  3. 3

    Use flux-3-image

    Send a prompt to /v1/images/generations with a size and aspect ratio, and get back a link to your image.

    flux-3-image

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FAQ

FLUX 3 Image API questions.

Anything else? Ask our team and we’ll answer by email.

How much does the FLUX 3 Image API cost?

$0.04 for a 1K image, $0.05 for 2K and $0.09 for 4K, generation or edit. Black Forest Labs' own price is $0.048, $0.10 and $0.607. You pay per image delivered, and failed attempts are not billed.

Which sizes and aspect ratios does FLUX 3 Image support?

1K (the default), 2K and 4K, in 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 and 9:21. Every shape has about the same area: one megapixel at 1K, four at 2K and sixteen at 4K, such as 1024 × 1024 square at 1K or 5472 × 3072 for 16:9 at 4K. A 1K image in a shape other than square can come back at the 2K size, at the 1K price.

Can I edit images with FLUX 3 Image?

Yes. Send one image in images on /v1/images/generations, as an https URL or a base64 data URL, or as a file to /v1/images/edits with the OpenAI SDK, and describe the change. Without an aspect_ratio, the result keeps the shape of the image you send. Combining several reference images isn't available on Zurelay yet.

How do layout boxes work?

Tag each element in the prompt, like <sun_1>, and end the prompt with a JSON list of boxes: id, a bbox of [x1, y1, x2, y2] on a 0 to 1000 grid, and a short description. FLUX 3 puts each element inside its box. Set aspect_ratio to the shape you drew the boxes for.

Can I call the FLUX 3 Image API with the OpenAI SDK?

Yes. Point the OpenAI SDK at https://api.zurelay.com/v1 and call images.generate with model flux-3-image and size 1K, 2K or 4K. Pass aspect_ratio through extra_body in Python or as an extra body property in Node.

Is this Black Forest Labs' FLUX 3 Image?

Yes. Your requests run on FLUX 3 Image, and Zurelay checks each image's resolution and shape before delivering it. Zurelay is an independent service and is not affiliated with or endorsed by Black Forest Labs.

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