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.

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

Nani Pelekai (Lilo & Stitch) - Lora Illustrious Illustrious

Akabur Style PDXL, Illustrious Akabur V2.5

A surreal abstract portrait of a young woman with platinum blonde hair and pale skin, her face partially obscured by bold, colorful horizontal brushstrokes in yellow, blue, red, green, and white against a dark background.

biostuff experiments - mushroom house v0.1 mossystuff

Get inspirations

Made on Diffus

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

A dramatic oil painting in fantasy realism style showing a knight in black armor embracing a lady in a flowing white dress beneath a massive ancient banyan tree at sunset, with textured brushwork and a warm earthy palette.

A muscular cave-man warrior in tribal armor rides a large rhino-like monster under a bright full moon with backlighting, depicted in a realistic digital painting style.

A female warrior with long dark hair in intricately detailed dark green and gold-trimmed armor, holding a double-edged glaive, against a deep emerald background.

Digital painting of a dystopian snowy beach with towering futuristic skyscrapers, a red-hooded figure walking on the snow, under double moons and dramatic golden light.

Three grotesque demonic creatures with glowing red eyes emerging amidst intricate gothic cathedral ruins with worn stone stairs and red dripping marks.

An old wizard with white hair and beard wearing a yellow coat and black robes, walking with a cane through an intricate, fantastical cityscape bathed in yellow and cyan hues with towering, elaborate architecture.

A teen female angel with long flowing red hair, wearing an ornate black and gold corseted dress with intricate details, and large black feathery wings, illuminated by Rembrandt lighting against a dark, nebulous background.

Close-up side view of a hyper-realistic eye glowing with aqua electric energy, showcasing intricate details and dynamic lighting effects.

Close-up hyperrealistic cyberpunk portrait of a girl with messy brown dreadlocks, sun-kissed skin, henna mandala tattoos, facial piercings, and expressive eyes, featuring warm colors and a furtive gaze.

A tall, dark humanoid figure with large feathery wings hovers above a cloaked crowd in a dimly lit stone hall illuminated by candles.

Full body portrait of a tall girl with space buns hairstyle wearing black lace top with yellow details, black shorts, patterned black tights and ankle boots, standing on a rooftop surrounded by white dust and mysterious dark hooded figures in the background with a maroon gradient backdrop.

Portrait of a woman with short curly hair, softly blurred with morning light and shadows, photographed in the style of Paolo Roversi.

Highly detailed futuristic cityscape featuring a sleek red sports car on an elevated highway with neon lights and cyberpunk architecture.

CGI-rendered futuristic cityscape with a woman standing on a platform wearing an orange robe, surrounded by towering metallic skyscrapers under dramatic lighting.

A highly detailed digital artwork showcasing a futuristic architectural structure with metallic spires and warm lighting, set in a mountain landscape with reflective water at dusk.

An ethereal woman with long flowing white hair wearing a sparkling white gown stands in a misty, moonlit field surrounded by glowing fireflies with tall dark structures in the background.

Ultra-realistic portrait of a female biomechanical robot with white metallic skin and gold accents, looking upward with dramatic lighting.

A guard in a detailed scarlet robe stands solemnly by still water reflecting the full moon and dark, jagged Mordor landscape under volumetric moonlight.

A golden metallic robot with a skull-like face surrounded by swirling smoke in a dark, atmospheric setting.

Highly detailed mechanical cyborg with a polished white helmet and intricate metal skeleton standing in a dim, deteriorated laboratory setting.

A dark fantasy warrior wearing intricate glowing armor with blue luminescence and an ethereal face mask, standing against a black background.

A female volleyball player reaching out to hit a volleyball very close to the camera, with her hair flowing and a volleyball net and crowd blurred in the background under a clear blue sky.

A photorealistic fog enveloping a cityscape with silhouettes of trees and a prominent building, bathed in soft hues of pink, yellow, and orange at sunset.

Surreal dark and moody mountain landscape with a double exposure effect forming a colorful all seeing eye pyramid, sun and moon behind clouds in the sky.

A man and woman holding hands and standing by a large circular window, admiring a detailed futuristic cityscape with skyscrapers and a river under a bright sky.

A sci-fi woman with wild blonde hair stands confidently inside a mechanical and surreal spaceship interior, wearing a long orange coat and black boots.

A futuristic warrior clad in highly detailed power armor with a helmet, holding a large red and black spear in a war-torn cityscape background.

A woman in a futuristic orange outfit with black gloves posing dynamically in front of a mechanical and organic spacecraft background in outer space, with flowing fabric and contrasting light and dark elements.

Portrait of a serene female figure with a pale porcelain-like face, adorned with an intricately designed black and gold ornate headdress featuring baroque filigree and cosmic symbols, wearing a high-collared black garment with golden embroidered patterns.

A slender Japanese woman striking an eccentric, dynamic pose wears avant-garde armor-like fashion with spiked details, standing on a snowy rock under a sky filled with a holographic grid of cold-colored patterned figures.

$Side profile of a futuristic geisha wearing an emerald green kimono and a transparent glass headpiece with flowing fractal designs, styled in Sorayama and Yoshitaka Amano influences.$