Model Info and links

https://huggingface.co/black-forest-labs/FLUX.2-klein-base-4B

import torch
from diffusers import Flux2KleinPipeline

device = "cuda"
dtype = torch.bfloat16

pipe = Flux2KleinPipeline.from_pretrained("black-forest-labs/FLUX.2-klein-base-4B", torch_dtype=dtype)
pipe.enable_model_cpu_offload()  # save some VRAM by offloading the model to CPU

prompt = "A cat holding a sign that says hello world"
image = pipe(
    prompt,
    height=1024,
    width=1024,
    guidance_scale=4.0,
    num_inference_steps=50,
    generator=torch.Generator(device=device).manual_seed(0)
).images[0]
image.save("flux-klein.png")

Test 0 - Seed and guidance

Prompt: photorealistic girl in bookshop choosing the book in romantic stories shelf. smiling

Prompt: Create a close-up photograph of a woman's face and hand, with her hand raised to her chin. She is wearing a white blazer and has a gold ring on her finger. Her nails are neatly manicured and her hair is pulled back into a low bun. She is smiling and has a radiant expression on her face. The background is a plain light gray color. The overall mood of the photo is elegant and sophisticated. The photo should have a soft, natural light and a slight warmth to it. The woman's hair is dark brown and pulled back into a low bun, with a few loose strands framing her face.

Prompt: Generate a photo of a woman's legs, with her feet crossed and wearing white high-heeled shoes with ribbons tied around her ankles. The shoes should have a pointed toe and a stiletto heel. The woman's legs should be smooth and tanned, with a slight sheen to them. The background should be a light gray color. The photo should be taken from a low angle, looking up at the woman's legs. The ribbons should be tied in a bow shape around the ankles. The shoes should have a red sole. The woman's legs should be slightly bent at the knee.

Parameters: Steps: 50| Size: 1024x1024| Scheduler: FlowMatchEulerDiscreteScheduler| Seed: 2736029172| CFG scale: 4| App: SD.Next| Version: c95ff3d| Pipeline: Flux2KleinPipeline| Operations: txt2img| Model: FLUX.2-klein-base-4B

285H Time: 6m 32.89s | total 715.32 pipeline 392.86 preview 227.32 callback 95.10 | GPU 20062 MB 16% | RAM 26.75 GB 22%

Test 1 - Bookstore

Prompt: photorealistic girl in bookshop choosing the book in romantic stories shelf. smiling

Parameters: Steps: 32| Size: 1024x1024| Scheduler: FlowMatchEulerDiscreteScheduler| Seed: 1931701040| CFG scale: 6| App: SD.Next| Version: c95ff3d| Pipeline: Flux2KleinPipeline| Operations: txt2img| Model: FLUX.2-klein-base-4B

285H Time: 4m 12.24s | total 428.93 pipeline 252.21 preview 121.19 callback 55.50 | GPU 19696 MB 16% | RAM 29.23 GB 24%

Test 2 - Face and hands

Prompt: Create a close-up photograph of a woman's face and hand, with her hand raised to her chin. She is wearing a white blazer and has a gold ring on her finger. Her nails are neatly manicured and her hair is pulled back into a low bun. She is smiling and has a radiant expression on her face. The background is a plain light gray color. The overall mood of the photo is elegant and sophisticated. The photo should have a soft, natural light and a slight warmth to it. The woman's hair is dark brown and pulled back into a low bun, with a few loose strands framing her face.

Parameters: Steps: 16| Size: 1024x1024| Scheduler: FlowMatchEulerDiscreteScheduler| Seed: 1620085323| CFG scale: 1.0| App: SD.Next| Version: c95ff3d| Pipeline: Flux2KleinPipeline| Operations: txt2img| Model: FLUX.2-klein-base-4B

285H Time: 1m 3.77s | total 136.09 pipeline 63.73 callback 61.13 preview 10.65 vae 0.54 | GPU 19696 MB 16% | RAM 29.51 GB 24%

Test 3 - Legs

Prompt: Generate a photo of a woman's legs, with her feet crossed and wearing white high-heeled shoes with ribbons tied around her ankles. The shoes should have a pointed toe and a stiletto heel. The woman's legs should be smooth and tanned, with a slight sheen to them. The background should be a light gray color. The photo should be taken from a low angle, looking up at the woman's legs. The ribbons should be tied in a bow shape around the ankles. The shoes should have a red sole. The woman's legs should be slightly bent at the knee.

Parameters: Steps: 64| Size: 1024x1024| Scheduler: FlowMatchEulerDiscreteScheduler| Seed: 1931701040| CFG scale: 4| App: SD.Next| Version: c95ff3d| Pipeline: Flux2KleinPipeline| Operations: txt2img| Model: FLUX.2-klein-base-4B

285H Time: 8m 15.91s | total 828.99 pipeline 495.88 callback 308.33 preview 24.74 | GPU 22654 MB 18% | RAM 29.42 GB 24%

Test 4 - Other model covers

Test 5 - Other prompts

Test 6 - Optional find the cover

Test 7 - Empty prompts

System Info

Wed Feb  4 19:15:39 2026
app: sdnext.git updated: 2026-02-02 hash: c7ecba67c tag:  tags:  url: https://github.com/liutyi/sdnext/tree/pytorch
arch: x86_64 cpu: x86_64 system: Linux release: 6.14.0-37-generic 
python: 3.12.3 PyTorch: 2.10.0+xpu
device: Intel(R) Arc(TM) Graphics (1) ipex: 
ram: free:51.66 used:10.67 total:62.33
xformers: diffusers: 0.37.0.dev0 transformers: 4.57.5
active: xpu dtype: torch.bfloat16 vae: torch.bfloat16 unet: torch.bfloat16
base: black-forest-labs/FLUX.2-klein-base-4B refiner: none  vae: none te: none unet: none

App config

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Model metadata

black-forest-labs/FLUX.2-klein-base-4B

Schedule

FLUX.2-klein-base-4B-model-test.json