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.

Rhea/レア (Fire Emblem: Three Houses) SDXL LoRA | 5 Outfits [Illustrious] v1 (Illustrious)

zhongfenghuaStyle_FLUX_ Lora | 厚涂笔触_FLUX版_ Lora v1.0

Extreme close-up of a person with ashy skin wearing aviator goggles with colorful reptilian lenses, bright green lipstick, long black hair with vibrant green streaks, and blue ribbons, surrounded by neon bokeh light effects.

A pale-haired gothic sorceress clad in detailed black and gold armor wielding a rune-inscribed sword, standing on rocky terrain before a colossal obsidian dragon with glowing crimson eyes, set against a pink and purple ethereal sky.

A girl with folded ponytail wearing a white dress with Juliet sleeves and white strappy heels sits calmly on a wooden bench next to a fierce black dragon, illuminated by dappled sunlight filtering through surrounding foliage.

Ant King Beru Solo Leveling IL / PD / XL-GMR Ant King Beru Pony-GMR

Fusor's Cute-sor Style II [Illustrious] v1.0

Toadette (Super Mario) - [Anima/IL] Illustrious

Fire Human | Fantasy Fire Human | Ver 2.0

Get inspirations

Made on Diffus

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

A porcelain-smooth tiny fairy with delicate folded wings stands next to a tall, tied stack of aged book pages rendered in a subdued sepia palette with soft light.

A petite elf girl with platinum white hair and ethereal skin holds a glowing glass sword, wearing a detailed Victorian-style red dress with lace and silver accents in Rembrandt style.

A digital painting of a teen cyborg girl with striking long red hair, blue eyes, and pale white skin, wearing a black tight bodysuit with detailed mechanical joints and ribbed chest under Rembrandt lighting.

Impasto style painting of a woman with long black hair wearing a flowing yellow and red dress and red high heels, set against a textured gray background.

Surreal portrait of a woman with dark hair and golden eyes, featuring a bird painted on her face, surrounded by yellow birds and flowers including a large pink rose.

A girl demon with white hair in two ponytails tied with black bows, glowing red eyes, and pale skin, wearing a detailed black gothic dress and black gloves with claws, standing under moonlight with large black wings spread out and a ruined gothic architecture background.

A pink-haired woman with blue eyes in a delicate turquoise hanfu and high heels sits with crossed legs, petting the head of a giant white and teal snake coiled around her.

Hyperrealistic close-up portrait of a young male in cyberpunk attire wearing orange-tinted glasses and dark futuristic clothing.

Watercolor-style drawing of a deep underwater city featuring glowing cylindrical buildings connected by bridges, with whales swimming above and intricate architectural details extending into the ocean depths.

A radiant angel with glowing pink wings and a golden halo ascends above a vast field of luminous triangular geometric ripple lines against a deep black background.

A colossal mechanical leviathan made of gears emerges from an endless desert of sand, two explorers in reflective suits approach it, with sparks flying and shadows cast on the sand.

Close-up hyper-realistic oil painting of a pale vampire girl with vivid red hair and blue eyes, wearing a black corseted dress with a gothic aesthetic.

Papercut style silhouette of a couple sitting closely together under a starry night sky with a bright crescent moon and shooting stars.

Silhouette of a couple sitting close together on a rooftop edge against a starry night sky with a crescent moon, shooting stars, and a vibrant scattering of orange dots.

Detailed depiction of a dove girl with long pearlescent hair, feather dress in purple hues, lavender iridescent eyes, animal ears, amidst flying doves and an abstract feathered background.

A middle-aged male cybernetic operative wearing dark tactical coat and advanced armor sits on a ledge overlooking a rainy, neon-lit cyberpunk city at night, head lowered in contemplation.

High-angle wide shot of a dense futuristic megacity canyon shrouded in fog with a lone silhouette figure seated on a cantilevered balcony on the far right, overlooking a neon-lit river corridor and towering skyscrapers under cinematic lighting.

A landscape featuring rolling green hills under a blue sky with gentle clouds and a large stylized orange-red sun with radiant rays at the center.

A cyberpunk warrior with spiky blue-black hair, wearing a torn white top and black utility shorts with metallic buckles, holding a battered plush panda and wearing a spiked armored gauntlet.

A grotesque humanoid creature with elongated limbs and a large bulbous head leans forward emerging from a circular white futuristic machine in a minimalist white room lit by diffused daylight.

Watercolor painting of an elderly Black man wearing headphones and a light-colored jacket, sitting on a subway bench with an introspective expression.

A bold portrait of a Black woman with voluminous afro hair passionately singing into a vintage silver microphone, wearing large red hoop earrings and a black top against a terracotta background.

A girl with black medium messy hair and glasses reading a book in her messy bedroom, illuminated by soft natural lighting.

Photorealistic close-up portrait of a highly detailed alien woman with geometric skull and sharp features set in a cinematic film still style.

Realistic street art mural on a white brick wall showing a black silhouette in a suit holding a red balloon, observed by a man standing nearby.

A synthetic angel stands on a cracked obsidian plinth in a ruined sanctuary flooded with overgrowth, featuring golden crystalline wings and a glowing halo at dusk.

A sunset over Italian mountains with a crystal lake surrounded by autumn foliage and blooming pink flowers, a quaint village perched on cliffs above tranquil waters.

Four witches sitting around a glowing fire surrounded by tall blue mushrooms shaped like a crescent moon under a starry night sky.

Close-up of a high-detail horror-themed mechanical skull with glowing eyes, sharp jagged teeth, and a cracked blue metal mask against a red background.

A mysterious fantasy creature composed of translucent water-like tentacles rises in a floral-filled town square with old buildings and a person facing it.

Close-up portrait of a young Asian woman with striking yellow eyes, dark tousled hair, and a translucent orange-red scarf partially covering her face.

$A surreal depiction of Little Red Riding Hood rendered in a fractured stained-glass Cubist style, showing a girl in a red cloak within a dense forest with geometric shard divisions.$