Updated: Jan 16, 2026
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The FLUX.1 [dev] Model is licensed by Black Forest Labs. Inc. under the FLUX.1 [dev] Non-Commercial License. Copyright Black Forest Labs. Inc.
IN NO EVENT SHALL BLACK FOREST LABS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH USE OF THIS MODEL.
flux2_klein-SDXL_Upscale_workflow
(text to image upscale)
The purpose of this workflow is to mix flux2_klein excellent prompt tracking and high image quality with illustrious-SDXL's vast AGC character resources.
In other words, characters that flux2_klein has not yet learned can be expressed using illustrious-SDXL's learned resources without using Lora.
It combines flux2_klein and SDXL for extremely fast generation speeds.
This is how I use it, but it's up to you to use it in your own way.
* Note *
Turn Off Upscale-Switch, only flux2_klein will be rendered.
Can be used as a regular flux2_klein workflow
Doesn't upscale anything
Upscale ratio 1.5 to 2.0 (1.5 recommended)
Requirements
ComfyUI ver. 0.9.1 or higher
flux2_klein
Models
flux-2-klein-4b-fp8.safetensors
or
text_encoders
VAE
https://huggingface.co/Comfy-Org/flux2-dev/resolve/main/split_files/vae/flux2-vae.safetensors
Illustrious Model
Civitai | Share your models Illustrious Checkpoint
also recommend my merge model
DMD2 Speed LoRA
dmd2_sdxl_4step_lora_fp16 or dmd2_sdxl_4step_lora_fp32
Recommend upscaler lollypop
https://huggingface.co/uwg/upscaler/blob/main/ESRGAN/lollypop.pth
Use Custom Node
https://github.com/pythongosssss/ComfyUI-Custom-Scripts
https://github.com/yolain/ComfyUI-Easy-Use
https://github.com/LEv145/images-grid-comfy-plugin
https://github.com/pixelpainter/comfyui-mute-bypass-by-ID
