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.

Photorealistic image of a Japanese girl with blue bob hair wearing a shiny white and black edgPlugsuit bodysuit sitting on a rooftop at sunset in Tokyo.

Steampunk woman wearing a corset dress and tiny top hat, holding an owl, standing framed in a riveted teal train doorway with cinematic low-key lighting.

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)

Get inspirations

Made on Diffus

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

A mystical librarian in flowing celestial robes holding an open book, standing between towering ancient bookshelves, with a cosmic nebula sky blending into the vast library background.

Surreal floating city constructed from towering blue-green crystal buildings above clouds at dawn, rendered in a dinkfsn style ink wash painting.

A mysterious gothic queen with pale skin, glowing fiery red eyes, wearing a detailed black armor and a dark crown emitting red fiery energy in an ethereal gray swirling background.

Close-up of a cyberpunk robotic face wearing a futuristic helmet with glowing red circuitry patterns and red illuminated eyes.

A futuristic robot with glowing eyes stands thoughtfully while painting a detailed nature scene with trees and a river on a canvas.

A battle-ready cyberpunk geisha stands in a neon-lit back-alley temple, wearing a futuristic kimono with graphene armor and mechanical targeting implants on her face and hair.

A huge dragonfly with golden-orange wings and scales, carrying a human rider sitting in a saddle on its back, flying over a rocky and grassy fantasy landscape under a blue sky with fluffy clouds.

Ultra-realistic digital portrait of a cyberpunk girl wearing futuristic black armor embedded with red fluorescent lights, set against a softly lit brooding cityscape with depth of field effects.

Woman with short dark hair wearing a weathered red and silver mecha exoskeleton in a snowy mountain environment with blurred peaks in the background

Black and white overweight cat standing upright on a sidewalk wearing a black Batman costume and sneakers in front of a yellow gas pump and electric car charging station on a sunny day.

A barefoot girl with short blonde hair sits casually on the edge of a rooftop against a bright blue sky with fluffy clouds, surrounded by green plants.

A girl with short blonde hair stands alone in a dark forest clearing illuminated by soft sunlight filtering through tall trees, creating an otherworldly atmosphere.

A highly detailed painting of a majestic three-masted pirate ship anchored in a tranquil tropical cove, with black sails marked by a large white skull and crossbones, surrounded by lush green islands under golden dawn light.

A vast alien crater housing a mysterious sci-fi research facility with a glowing blue core emitting light through concentric rings, surrounded by a purple desert landscape and jagged mountains.

A majestic steampunk airship adorned with rococo scrollwork and illuminated windows floats through a stormy sky under a full moon above an alien jungle.

A digital artwork of a woman with long white hair wearing a black latex bodysuit and thigh-high boots, sitting sideways on an ornate pedestal with a glowing pink cyberpunk background.

A towering obsidian monolith with twisted bone-like roots rises amid swirling purple nebula clouds, green ethereal fire wisps dance around its base in a Risograph print style.

Young girl wearing a Japanese school uniform standing on a balcony at sunset with soft evening light illuminating her and the background cityscape.

A surreal and ethereal hand emerging dramatically from water, surrounded by splashing droplets with a misty, dreamlike landscape in the background.

Black and white portrait of a goth girl wearing a black dress with a strict white collar, holding a small vial of poison in a cemetery background, with intense gaze and wet slicked-back hair.

Low-angle portrait of a porcelain-skinned young woman with a jet-black bob and choppy bangs, wearing a black turtleneck and a daisy-embroidered pinafore, yellow cable-knit knee-high socks, sitting against a bright cerulean sky with translucent soap bubbles floating around.

A close-up drawing of a girl with long white hair partially covering her yellow eyes, surrounded by large bright sunflowers on a white background.

Ultra-close macro photo of a woman's face with black hair, showing fine details with a low saturation and an otherworldly atmosphere in hyperrealistic style.

A regal androgynous character with platinum-blonde hair, wearing a purple top hat and aristocratic coat adorned with intricate gold embroidery, rose-tinted glasses, and magenta eyeshadow.

$A weathered Celtic druid in a bearskin cloak stands chanting over a large cursed standing stone covered in glowing green ogham runes, with sunlight fracturing through distant megaliths.$