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.

0/2

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.

Woman warrior standing barefoot against a flat yellow background, wearing a deep purple kimono with golden phoenix embroidery, holding a large ornate halberd, with a blunt ash-blonde bob haircut.

All Disney Princess (Illustrious) Illustrious

An anatomical chart illustrating a great horned owl as a surveillance drone, showing half natural feathers and half robotic machinery with wires, processors, and sensors.

A tall winged figure in a blue dress adorned with swirling colorful abstract patterns stands against a dark background with artistic splashes and tiny curious characters at her feet.

White-haired girl with blue eyes sitting on a subway bench with an abstract background filled with many blue eyes.

A glamorous woman in a deep red sequin dress performing with a vintage microphone on a stage with a grand piano and dramatic lighting in a retro nightclub setting.

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.

Get inspirations

Made on Diffus

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

A woman in a red sheer dress illuminated by red light stands before two large blue flowers against a dark background, creating a dramatic contrast.

A warrior with white hair stands on a rocky cliff near a tall, cascading waterfall in a Nordic fjord landscape featuring rugged cliffs and misty water.

A fierce female warrior in black and gold power armor holding a glowing red spear, standing in a gothic cathedral with supernatural red energy swirling around her.

A fierce female warrior with cat ears, silver spiky hair, yellow slit pupils, and scars wearing power armor, holding a glowing axe, standing on the moon with a large full moon and starry sky background.

A colossal dark fantasy spider with glowing eyes hovers above a towering ancient spire surrounded by eerie fog and ghostly battlefield.

Digital artwork of a chrome skeleton wearing a white leather jacket with a hood, holding a futuristic rifle against a solid red background.

Vintage-style 1930s movie still of a woman in a black dress adorned with an intricate necklace and earrings, standing in front of a large crescent moon, with classic makeup and closed eyes.

An abandoned rusted cyborg covered in vines and pink and yellow flowers lying on its back with a watercolor splatter backdrop.

Close-up cinematic portrait of a young woman with vibrant ginger hair styled in two buns, bright blue eyes, freckles, red lipstick, wearing a blue and white striped shirt with floral neckline.

A glossy yellow duckling with a wide beak featuring sharp dripping teeth, floating in shimmering yellow water with a dreamy yellow background.

A bold pop art-style illustration of a shiny metallic ring with a pink glossy finish and the word 'YEAH' engraved on top, set against a vibrant blue background.

A confident fashion model with blonde hair and pink sunglasses wearing an orange sleeveless dress and pink high-heeled boots standing on an urban street with palm trees and pastel buildings under a clear blue sky.

A crowded medieval market alley lined with timber-and-plaster buildings, featuring a hooded merchant at a wooden stall displaying brass amulets and trinkets bathed in warm amber light.

Portrait of a slender fae female with pale blonde hair and luminous green eyes, wearing a black cloak and tunic, holding a dagger amid deep shadows.

A black silhouette figure with angel wings and a glowing halo, featuring vivid red streaks in the hair, set against a neutral beige background with dramatic chiaroscuro lighting.

A tattooed man with flowing white shirt and tattered pants stands on a rusted staircase in a smoky, golden-lit post-apocalyptic cityscape.

A terrified woman looks up from the bottom of a dark, claustrophobic well as a rusty bucket is lowered on a rope above her, casting eerie shadows.

Close-up ink splash art portrait of a sultry Asian woman with flowing black hair, dark eyeshadow, red lips, and an abstract yellow background.

Close-up portrait of a woman with pale skin wearing a blue beret, vibrant rainbow glitter eyeshadow, magenta glossy lipstick, and playfully sticking her tongue out.

Portrait of a woman with pink-red hair and blue eyes against a black backdrop, illuminated by soft studio lighting highlighting her sharp facial features.

A pastel-colored fantasy landscape inspired by Studio Ghibli, featuring a towering tower resembling a female form, surrounded by fluffy clouds, overlooking a calm blue sea and pebbled shore with a seated figure.

Surreal vector illustration of a female African ghost nun wearing a simulated plugsuit and a metallic crown, highlighted with a bold cyan and pink palette.

Dynamic digital illustration of a female outlaw wearing a flowing red dress and cowboy hat, holding two golden revolvers with visible tattoos on her arms and leg.

Side view of a winged air elemental dressed in a pink gown with white wings, resting amid a dark, apocalyptic castle environment with billowing dust.

A black-toned Renaissance-style depiction of a rusting, intricate steampunk car overgrown with bronze detailing, set in a dark, eerie environment resembling a pristine hell.

Stylized illustration of a blonde girl with a loose braid wearing a bandeau top, wide cargo pants with suspenders, standing against an abstract blue and ochre background.

A stylized figure with pale blonde hair in a braid, wearing a sleeveless high-collar white dress with asymmetrical hem, sitting on a low wall. The silhouette is shaded deep blue against a simple white background.

A hyper-realistic cyberpunk portrait of a young woman with tanned skin, short black hair, and brown eyes, wearing metallic techwear, holding a glowing orb against a cityscape background.

Silhouette of a man wearing a winter coat standing in an autumn forest at night, illuminated by the headlights of a vintage car with fog and volumetric lights creating a mysterious and horror mood.

$A fractured humanoid silhouette in high-contrast black and white with textured cracked surfaces and a glowing amber eye, split between light and darkness.$