AEmotionStudio/flux-klein

FLUX Klein 4B — AEmotionStudio Mirror

Mirror of black-forest-labs/FLUX.2-klein-4B for use with ComfyUI-FFMPEGA.

About

FLUX Klein is a 4-billion parameter image editing and generation model from Black Forest Labs. It supports:

• Object removal — erase unwanted objects from images/video frames
• Text-guided editing — change hair color, swap backgrounds, modify clothing, etc.
• Inpainting — fill masked regions with contextually appropriate content

This mirror provides the same bf16 safetensors weights as the upstream repo, hosted on AEmotionStudio infrastructure for supply-chain resilience.

Model Details

Property	Value
Architecture	FLUX (Rectified Flow Transformer)
Parameters	4B
Precision	bf16 (bfloat16)
Total Size	~15 GB
License	Apache 2.0
Source	black-forest-labs/FLUX.2-klein-4B

Files

Component	File	Size
Transformer	transformer/diffusion_pytorch_model.safetensors	7.4 GB
Text Encoder (T5-XXL)	text_encoder/model-00001-of-00002.safetensors	4.7 GB
Text Encoder (T5-XXL)	text_encoder/model-00002-of-00002.safetensors	2.9 GB
VAE	vae/diffusion_pytorch_model.safetensors	160 MB
Tokenizer, configs	tokenizer/, scheduler/, *.json	< 15 MB

Usage with ComfyUI-FFMPEGA

This model is auto-downloaded when you use the auto_mask skill with effect=remove or effect=edit in ComfyUI-FFMPEGA.

Object Removal

Prompt the FFMPEGA Agent:

Remove the watermark

Or use the Effects Builder with SAM3 target + remove effect.

Text-Guided Editing

Prompt the FFMPEGA Agent:

Change the hair to red

Or use auto_mask with effect=edit and edit_prompt="change the hair to red".

Manual Download

If auto-download is disabled, download all files and place them in:

ComfyUI/models/flux_klein/

VRAM Requirements

• Minimum: ~8 GB (with aggressive CPU offloading)
• Recommended: ~13 GB (bf16/fp16, sequential CPU offload)
• GPUs without native bf16 support (pre-Ampere) automatically use fp16 at load time

License

The model weights are licensed under Apache 2.0 by Black Forest Labs. See LICENSE.md for full terms.

Citation

@misc{flux2klein2025,
  title={FLUX.2 Klein},
  author={Black Forest Labs},
  year={2025},
  url={https://huggingface.co/black-forest-labs/FLUX.2-klein-4B}
}