Open weights

FLUX 3 Image Klein

Frontier quality with the speed and customization of open weights.

Download open weightsRead the docs
Talk to us about licensing
  • A green Lisbon kiosk with a sign reading LIMONADA FRESCA
  • Ukiyo-e print of a lighthouse keeper in a storm
  • Portrait of a woman in a denim jacket against orange
  • A red book cover reading Design Harder
  • A freediver gliding above a coral reef
  • Anime witch flying over a town at dusk
  • An eagle hunter holding a golden eagle at golden hour
  • Art deco travel poster reading RIVIERA EXPRESS
  • Portrait of a young man in an olive bomber against teal tiles
  • Stained-glass owl in front of a full moon
  • A glassblower shaping a glowing bulb in a dark workshop
  • Risograph poster reading SUNDAY RIDE
  • Black-and-white portrait of a man smoking a cigarette
  • Byzantine mosaic of a peacock in blue and gold
  • A model in a mustard trench coat on a salt flat

The most capable open weights image model

5.6B parameters, runs on a single consumer GPU, and draws on FLUX 3’s shared learning across images, video, and audio.

Undistilled version for fine-tuning and research, a distilled version for fast generation, and API access with prompt enhancement, pixel-perfect editing, and native 4K.

  • Run it anywhere

    Your hardware, your cloud, your pipeline.

  • One model, every task

    Generation, editing and multi-reference in a single set of weights.

  • Build on it

    Fine-tune it, distill it, wire it into ComfyUI or your own stack.

Compose images from scratch or make precise edits

Use bounding boxes to define a layout or make targeted edits.

A navy postage stamp with a white long-haired cat under a gold crescent moon, the text 日本 INTERNATIONAL POSTAGE STAMP, the year 1959 and the kanji 猫
  1. Text_1[80, 98, 392, 322]

    Cream type in the top left: a large brush-stroke “日本”, with “INTERNATIONAL POSTAGE STAMP” running top to bottom beside it.

  2. Text_2[98, 673, 184, 895]

    The year “1959” in a bold gold face.

  3. moon[111, 431, 272, 578]

    A thin gold crescent moon in a sky scattered with small gold stars.

  4. cat[282, 108, 930, 898]

    A fluffy white cat with blue eyes lying across the stamp, looking up at the moon, its long tail sweeping along the bottom.

  5. Text_3[778, 764, 928, 911]

    A large cream kanji “猫”.

What it makes

Photography

Detailed skin, fabric, weather, and light.

  • A giant koi swimming through fog above rice terraces
  • Portrait of a woman in a denim jacket against orange
  • An eagle hunter holding a golden eagle at golden hour
  • A steaming dumpling stall at a night market in Taipei
  • Black-and-white portrait of a man smoking a cigarette
  • Macro of a jumping spider on a dewy fern
  • A red fox asleep in a vintage suitcase on a train
  • Portrait of a young man in an olive bomber against teal tiles
  • A green Lisbon kiosk with a sign reading LIMONADA FRESCA
  • A glassblower shaping a glowing bulb in a dark workshop
  • A woman in a pink dress against a cream wall
  • A model in a mustard trench coat on a salt flat
  • Low-key portrait of an old bearded man
  • A freediver gliding above a coral reef
  • A snow leopard resting on a rocky ledge

Illustration

Design your style across woodblock, mosaic, clay, pixels, anime, and more.

  • Ukiyo-e print of a lighthouse keeper in a storm
  • A figure in red floating among rainbow pinwheels
  • Cross-stitch hummingbird and hibiscus in an embroidery hoop
  • Claymation astronaut planting a flower on the moon
  • Anime witch flying over a town at dusk
  • Stained-glass owl in front of a full moon
  • Red and black linocut of a fox leaping a fence
  • Collage illustration of a footballer in a yellow number 9 shirt
  • Pixel-art ramen street at night in the rain
  • Isometric diorama of a tiny two-storey bookshop
  • Anime pilot in front of a giant mecha in a hangar
  • Byzantine mosaic of a peacock in blue and gold
  • Neon sign of a cat holding a coffee cup on a brick wall
  • Needle-felted hedgehog in a mushroom forest
  • Anime figure with a clear umbrella in a neon street
  • Charcoal sketch of an old boxer with taped hands

Type and design

Rapidly explore graphic design ideas.

  • A red book cover reading Design Harder, Black Forest Labs
  • Art deco travel poster reading RIVIERA EXPRESS
  • Miso ramen recipe infographic in four steps
  • Illustrated sign reading LET IT GO
  • Risograph poster reading SUNDAY RIDE
  • Labelled anatomy of a sourdough loaf
  • Overlapping colourful letters spelling House
  • Timeline infographic: a short history of flight
  • The water cycle infographic
  • How coffee gets to your cup, in five steps

Make multiple edits at once without changing anything else

Edit any part of an image while preserving the original.

  • A van on a tree-lined street, edited: Turn this summer street into winter after light snowfall.
    A van on a tree-lined street
    InputEdit
    Turn this summer street into winter after light snowfall.
  • A waterfall in a forest, edited: Freeze the waterfall into blue-white ice and long icicles.
    A waterfall in a forest
    InputEdit
    Freeze the waterfall into blue-white ice and long icicles.
  • A dog looking up at the camera, edited: Tie a small red bandana around the dog's neck.
    A dog looking up at the camera
    InputEdit
    Tie a small red bandana around the dog's neck.
  • A blue convertible in a leafy car park, edited: Put the convertible on an empty desert road under a clear sky.
    A blue convertible in a leafy car park
    InputEdit
    Put the convertible on an empty desert road under a clear sky.
  • Sand dunes at sunset, edited: Add a small caravan of three camels along the dune ridge.
    Sand dunes at sunset
    InputEdit
    Add a small caravan of three camels along the dune ridge.
  • A sailing boat with white sails, edited: Add broad crimson stripes across the sails.
    A sailing boat with white sails
    InputEdit
    Add broad crimson stripes across the sails.

Commercial weights

Running FLUX 3 Image Klein in a product? A commercial license covers self-hosted deployment at scale. Reach out to us to learn more.

Contact sales

Start building with FLUX 3 Image Klein.

Download the weights, read the license, and run it on your own hardware.

Download open weightsLicensing

Frequently asked questions

What is FLUX 3 Image Klein?

FLUX 3 Image Klein is the open-weights member of the FLUX 3 Image family. It generates images from text, edits them from an instruction and combines several references into one image, all in a single model you download and run on your own hardware.

How do I use it?

Download the weights from Hugging Face and run them in your own pipeline, or wire the model into ComfyUI or your own stack. The docs cover setup, prompting and layouts with bounding boxes. Read the docs

Can I place elements with bounding boxes?

Yes. Give each element a box and a description, and Klein renders it inside that box. The canvas is a 0 to 1000 grid on both axes, whatever the aspect ratio, and each box is written as [y_min, x_min, y_max, x_max].

Can I fine-tune it?

Yes. The weights are yours to fine-tune, distill and build on, within the terms of the license they come with.

What license are the weights under?

The open weights come with the license on their Hugging Face model card. Read it before you use them; the licensing page explains how our model licenses fit together. Licensing

Can I use FLUX 3 Image Klein in a commercial product?

Running Klein in a product needs a commercial license, which covers self-hosted deployment at scale. Talk to us about the terms. Contact sales