What is Flux.2 Klein?

Klein is the open-weights line of Black Forest Labs' Flux.2 generation, released in 9B and 4B sizes. It is the successor to the Flux.1 family that most open image models were built on.

No. Generation runs on our GPU pool, so a laptop or phone browser is enough. A 9B model locally means a large download and a card with the VRAM to hold it.

Which Klein sizes can I use?

Both 9B and 4B, plus the community checkpoints and LoRAs built on either, of which there are more than 2,100 on Civitai today.

Can I edit images with Klein, not just generate?

Yes. The Klein node in ComfyUI covers generation, editing, inpainting, outpainting and face swap in one place.

How does Klein compare with Flux.1?

Flux.1 still has by far the larger community — roughly 25,000 models on Civitai against 2,100 for Klein — so Flux.1 wins on ecosystem while Klein is the newer architecture. Both are here, so judge on your own prompt.

Can I import a Klein model from Civitai?

Yes. Paste the model URL and Diffus imports it — weights, previews and trigger words — then puts it in the generator.

Plans start at $1/month and every plan is credit-based, so the cost of a generation is visible before you run it.

Black Forest Labs' Flux.2 line

Run Flux.2 Klein in Your Browser

Klein 9B and 4B, plus the 2,100+ community models built on them. No 9-billion-parameter download, no GPU, no environment to keep alive.

The difference, not the spec sheet

Why Run Klein Here

The weights are open. What is not free is the disk, the card and the afternoon of setup.

2,100+ Klein Models, Already Hosted

Community checkpoints and LoRAs built on Klein 9B and 4B are on disk and selectable. Paste a Civitai link to add one that isn't.

Browse models

One Node, the Whole Workflow

Generate, edit, inpaint, outpaint and face swap from a single self-contained Klein node in ComfyUI — no graph to assemble before the first image.

Open ComfyUI

Compare It Against the Rest

Flux.1, Flux Kontext, Qwen, SDXL and SD 3.5 are in the same session. Run one prompt through several and keep what wins.

Start generating

Core capabilities

What You Can Do With It

Generation is the first step, not the whole job.

Prompt to picture

Text to Image on Klein

Prompt Klein 9B for quality or 4B when you want the lighter model, at the aspect ratio you need, with the sampler and guidance already tuned for the Flux.2 line.

Start generating

Edit where you generate

Edit, Inpaint and Outpaint

The Klein node covers editing in the same place you generate — repaint a region, extend the frame, swap a face — without exporting and losing the parameters.

Open ComfyUI

Bring your own LoRAs

Stack Community LoRAs

Klein has its own growing LoRA ecosystem on Civitai. Import one by URL and stack it, or fine-tune your own here and use it the moment training ends.

Browse models

How it works

Three Steps, No Setup

Nothing to download and no hardware to buy.

step 1

Pick Klein

Choose Klein 9B or 4B, or a community fine-tune built on either.

step 2

Write the Prompt

Or bring an image to edit — the same node handles both.

step 3

Generate and Refine

Inpaint, outpaint or upscale in place. Outputs land in your gallery.

Get started

Free creator tools

More Free Tools to Try

Single-purpose tools that need no setup. Describe it, click, done.

Flux 1 Image Generator

Text to image on the Flux.1 line, with community LoRAs.

Try for free

Flux Kontext Image Editor

Prompt-guided edits that keep character and style consistent.

Try for free

AI Image Generator

Text to image with community models, styles and aspect ratios.

Try for free

Explore the library

Models Built on Flux

Checkpoints and LoRAs across the Flux line, ready without a download.

A cat girl character with black hair, green eyes, round rimless glasses, cat ears, and tail, wearing an off-shoulder green sweater, kneeling barefoot.

Link from the legend of Zelda BOTW [FLUX DEV] v1.0

A stylized white-haired girl with green eyes wearing a dark green overcoat stands in a snowy village at night with falling snow and illuminated lampposts.

Close-up portrait of a girl with long black hime-cut hair and red eyes drinking blood from a blood bag using a straw, dressed in a white coat and black shirt with a red necktie, set against a dimly lit dark background with soft shadows.

A detailed landscape painting forming a face silhouette with a snow-capped mountain ridge, an alpine lake reflecting dawn light on the left, and a shadowed pine forest with a chapel clearing on the right.

Cyberpunk stylized portrait of a bald woman with tribal patterns and big eyes, lit by pink and blue light with glasses and electrical wires attached.

MeMaXL Flat Anime Style - Noob/Illustrious/Pony/XL v4.0 B [Zootlustrious-v2]

Vanillaware Style | Anima/SDXL v2.0 [Zootlustrious-v2]

Cyberpunk(Photographic style) SDXL V.1.0

A person dressed in an ornate metallic steampunk outfit stands on a foggy cobblestone platform holding a detailed gun, with a vintage steam train in the background.

Digital line art illustration featuring a woman reclining on a soft surface, viewed from behind, with flowing long blue hair and silk fabric draping over her legs, surrounded by glowing bokeh lights and orbs on a white background.

Vixon's Pony Styles - Kehoe v1.0 Kehoe v1.0

Get inspirations

Made on Diffus

Work from the community, with the model and prompt behind every image.

A young girl sleeping peacefully in her bedroom with glowing magical fairies flying above her bed, illuminated by moonlight through an old wooden lattice window.

A creepy elven assassin with pale skin and tangled black hair in a messy braid stands in a moonlit, desolate courtyard. She wears a tattered dark grey cloak over leather attire and holds a sharp obsidian dagger. A tiny sprite with iridescent wings perches on her shoulder. Gnarled trees and a stormy night sky form the background.

Oil painting of a serene young angel girl with large feathery wings, featuring a richly textured face with palette knife technique and a colorful abstract background.

A mature woman dressed in an ornate teal business suit kneeling on stone debris in a vast desert with a clear blue sky and stylized clouds, surrounded by rocky ruins and distant figures.

Close-up beauty portrait of a model adorned with layered gold and emerald jewelry, illuminated by a soft green light creating an ethereal glow.

A towering crystalline obelisk with celestial galaxies inside, set on an ancient stone platform with intricate carvings under a starry sky and aurora.

Three towering futuristic alien structures rise from a mirrored lake beneath a twilight sky, glowing with bioluminescent turquoise veins and reflecting perfectly on the water surface, with a large planet in the background and rugged mountains framing the scene.

Massive space elevator extending from floating islands to the sky at sunset, painted in warm colors with detailed clouds and birds, inspired by Studio Ghibli art style.

Cyberpunk style humanoid robot with a glossy black exoskeleton and glowing wires stands against a futuristic neon-lit cityscape at night.

A dark fantasy eldritch figure with a large organic horned headdress, surrounded by tangled bulbous root-like structures and pale spheres, in a detailed gothic style.

Portrait of a cyberpunk girl with pink hair, yellow eyes, sharp golden teeth, wearing a futuristic black outfit and metallic collar against a vibrant neon background.

A mage summoner with long hair and robes standing in a dark, reflective lake surrounded by glowing ethereal cats, facing a shadowy figure in a dense forest.

Close-up portrait of a woman with striking red eyes, detailed red and white face paint, and a red and white patterned headscarf.

A surreal endless stairwell made of ink spirals down through dark abstract layers with small human figures on steps, illuminated by a glowing circular light at the center.

Close-up photorealistic portrait of a tattooed woman with blue gradient hair, multiple piercings, black painted nails, and vibrant butterfly tattoos on her face against a red background.

A comic-style penguin wearing sunglasses and a floral shirt points at a computer screen filled with PG-13 rated movie thumbnails, questioning the rating system.

Miniature conductor figures stand on a railway platform built on an open book page with tall paper skyscrapers, as a graphite silver train approaches amid drifting paper dust and glowing amber station lights.

A miniature engineer stands on a glowing spider silk suspension bridge stretched between tall blades of grass, illuminated by golden dawn light over a foggy valley.

A gaunt pale blue-gray eerie creature with glowing yellow eyes and a crown of thorny branches crouches in a dark, misty swamp surrounded by tall reeds and mossy trees, with white butterflies fluttering and a distant human figure running through the background.

A serene moonlit village scene featuring a stone bridge over a gently flowing river reflecting street lamps, surrounded by willow trees and rustic houses.

A petite princess in a delicate red gown stands solemnly in a grand throne room, surrounded by four armored knights with stained-glass windows casting colorful rays.

Close-up hyper-realistic portrait of a red-haired woman with freckles wearing transparent glasses featuring small swimming golden fish.

Vibrant cosmic illustration of a Tyrannosaurus Rex head with open jaws revealing a colorful nebula and swirling galaxies inside, against a black background.

A towering spear-shaped megastructure rises from a frozen flatland, its surface adorned with glowing colorful neon ornamental patterns, surrounded by geometric circuitry platforms under a starry sky.

A dark moody portrait of a young teenager with short black hair combed to the side, intense blue eyes, wearing a high-collared black outfit against a solid intense blue background with dramatic lighting and shadows.

$A shattered moon named Xal'Tor floats above a rocky alien landscape, fractured into colossal shards with blue glowing energy emanating from cracks and a beam of light descending to the surface.$