Text to image workflow
FLUX.2 Klein Image
Black Forest Labs' fastest image model. It runs on a home graphics card, and what you make with it is yours to sell.
By Black Forest Labs·FLUX.2 Klein 4B
Prompt
“a lighthouse on a rocky sea cliff at sunset, long exposure photograph, no people”
What it does
Black Forest Labs built Klein for speed on ordinary hardware: in its words, real-time image generation without sacrificing quality, on a consumer graphics card. On our 8 GB card it makes one in about 30 seconds.
Photography
Scenes that look shot on a real camera. Name a film stock or a lens and it follows.
Prompt
“A rain-soaked Tokyo alley at night with glowing neon signs reflected in the puddles and steam rising from a vent, cinematic photograph, deep blues and magentas.”
Prompt
“A weathered fishing boat moored at a stone quay before dawn, ropes coiled on the deck, shot on Kodak Portra 400 at 35mm f/2, soft blue pre-sunrise light and still water holding the reflection.”
Prompt
“A small wooden cabin with a lit window in a snowy mountain valley at dusk, smoke curling from the chimney, the Milky Way rising overhead, long exposure landscape photograph.”
Prompt
“A green tree frog on a wet leaf after rain, macro photograph, water droplets in sharp focus, dark blurred forest background.”
Art styles
Ask for a style by name, from woodblock print to watercolor.
Prompt
“A red fox curled asleep in fresh snow under pine trees, illustrated as a Japanese woodblock print with flat colors, fine black linework and a pale winter sky.”
Prompt
“A narrow cobblestone street in an Italian hill town with laundry hanging between the balconies, loose watercolor painting on textured paper, warm afternoon light.”
Prompt
“A city of white towers floating above a sea of clouds at sunrise, airships drifting between them, epic fantasy concept art painting with soft golden light.”
Describe the picture in plain sentences, the way you'd describe it to a person, with the subject first. For a photo, name a camera, lens or film stock. It makes new images from text; it doesn't change a picture you already have.
To edit a picture you already have with the same model: FLUX.2 Klein Reference Edit →
Who made it
Black Forest Labs. The AI research lab in Freiburg and San Francisco behind the FLUX image models. Its founding team includes the researchers who created Latent Diffusion and Stable Diffusion.
They released FLUX.2 Klein 4B on January 15, 2026.
The model
FLUX.2 Klein 4B. Klein is German for small. It's the fastest line in the FLUX.2 family, one compact model that both makes and edits images. This workflow uses the smaller of its two sizes.
What it needs to run
Black Forest Labs says it fits in about 13 GB of graphics memory, an RTX 3090 or 4070 and up, and that its FP8 version needs up to 40% less. We run the FP8 version on an 8 GB RTX 2060 Super with 8 GB of RAM, at about 30 seconds an image.
How it compares
Krea 2 Turbo →
Krea's model, built for range of style. Needs a bigger card, and commercial use is free only for companies earning under $1 million a year.
Qwen-Image 2.1 →
Alibaba's model, known for text inside images. Research-only license, so nothing you make can be sold.
SDXL Image →
Stability AI's 2023 model, with years of community add-ons. Reads keyword lists rather than sentences.
License
FLUX.2 Klein 4B is released under Apache 2.0, so you can use what you make commercially.
Run it on FlixML Studio
Free and open source, on your own GPU.