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.

0/4

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.

Portrait of a nordic female demon with flawless crimson skin, white marble horns curving from her temples, sharp white graphic eyeliner, and avant-garde red couture fashion against a smoky gray background.

Anime-style girl in a pink hoodie bending forward, tying red high-top sneakers, with long brown hair and a green backpack outdoors in a park setting.

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 futuristic robotic insect warrior with golden butterfly wings and chrome armor stands confidently with cables in each hand, set against a vibrant paint splatter background.

A retro anime style wolf girl with ginger hair, wolf ears, and a bushy tail sits on a moss-covered balcony railing with a playful expression, plants around, and buildings in the foggy background.

Corin Wickes (Zenless Zone Zero) XL/Ilustrious LoRa v1.0

Jinx (Arcane / League of legends) | FLUX + Zimage Flux v2.0

STYLES | PONY & ANIMAGINE RMS v0.1 (Pony V6 XL)

A detailed digital illustration of a female angel with black and red hair, red eyes, white feathered wings, a cracked floating halo, wearing a black vest, white shirt, and red tie, featuring visible tattoos and scars on her arms.

[Pony] Geekpower Artists Style Optionaltypo

Get inspirations

Made on Diffus

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

A fantasy warrior in heroic armor stands on ornate medieval architecture ledge next to a massive golden dragon under sunset sky with dramatic clouds.

A colossal dragon with immense wings soaring over a sprawling grand fantasy city under dramatic clouds lit by warm sunset light, in a speedpainting style.

Young woman in an ivory lace chiffon dress and black velvet stockings reclining gracefully on a four-poster bed in a Victorian-era mansion softly illuminated by lamplight.

A bonsai tree preserved inside a glass jar filled with murky liquid, placed on a wooden window sill with a faded and decomposed appearance.

View through a stone archway revealing ancient castle ruins covered in ivy and moss, illuminated by soft dawn light with overgrown greenery surrounding the scene.

Tall futuristic tower surrounded by a sprawling sci-fi cityscape with multiple moons and celestial bodies in a dramatic cosmic sky.

A mysterious scene with towering red crystal structures in vertiginous shapes lining a dark pathway, and a woman dressed in red walking towards the distance.

A Soviet Arctic explorer wearing a weathered retro-futuristic spacesuit with CCCP insignia trudges through snow with the setting sun in the background.

A close-up of a hooded figure wearing an intricately detailed ornate mask with golden teeth, purple cloak, and visible eyes under a white and purple hood.

Close-up digital illustration of a cartoon black and white dog with large brown eyes and a red ladybug perched on its nose against a textured grey background.

A vividly colored fantasy frog sits inside a water droplet surrounded by swirling blue and orange inks, rendered on textured art paper in a surrealistic style.

Abstract painting featuring a female silhouette with dark tones, gestural brushstrokes, and a tricolor organic background blending dark blue, black, and orange hues.

Aerial photograph of a yellow seaplane flying over a vibrant turquoise ocean, leaving a white wake behind with visible underwater vegetation.

A cinematic portrait of a woman with her face partly illuminated by a narrow beam of warm orange light, casting dramatic shadows on her face and background.

Close-up of a slender, camouflaged praying mantis perched on a lush green leaf with soft diffused light and visible coarse film grain.

Illustration of two girls about to kiss, featuring heart-shaped pupils, camellia and lily flowers, depicted in a retro artstyle with volumetric lighting within a polaroid-style frame

A retro-futuristic portrait of a woman holding a red rose against a purple synthwave gradient background, wearing a sleek black outfit.

Old Danish opera diva in an ornate orange dress stands confidently amidst dark ages soldiers holding spears on a rainy cobblestone street with dramatic lighting.

Futuristic black robot with glowing red lines on chest and head standing against a dark, misty cyberpunk background.

A cyberpunk scene showing nomads wrapped in vibrant neon-patterned fabrics blowing in the wind, set against a glowing turquoise futuristic city with towering skyscrapers and neon billboards.

Witch wearing an oversized brimmed hat and flowing robe, with platinum blonde hair and glowing golden eyes emerging from shadow in dark background.

$Portrait of a seated figure with deep ultramarine skin marked by flowing gold veins, wearing a translucent garnet ceremonial robe with metallic embroidery, framed by golden filigree and set against fractured lavender tiles.$