Download Black Forest Labs’ ComfyUI files for FLUX.3 Image Klein, load the official text-to-image template, and save a 1024 × 1024 image on your own NVIDIA GPU.
Estimates for one 1024 × 1024 image with the prompt upsampler. Not measured by YouRunAI.
| Machine | FLUX.3 Image Klein Distilled · int8 | FLUX.3 Image Klein Base · int8 |
|---|---|---|
| NVIDIA RTX 3060/3070 · 8 GB VRAM + 32 GB RAM | Publisher’s target class for int8; ComfyUI offloads, so expect slower runs | Works with offloading; 50 steps make it noticeably slower |
| NVIDIA · 16 GB VRAM | Comfortable starting point | Comfortable; slower than distilled |
| NVIDIA RTX 4090/5090 · 24–32 GB VRAM | Fast; you can try the bf16 files | Fast; you can try the bf16 files |
| AMD Radeon · 16 GB VRAM | Not documented for these int8 files; use an NVIDIA GPU or RunPod | Not documented for these int8 files; use an NVIDIA GPU or RunPod |
| Intel Arc · 16 GB VRAM | Not documented for these int8 files; use an NVIDIA GPU or RunPod | Not documented for these int8 files; use an NVIDIA GPU or RunPod |
| Apple Silicon · 16 GB unified memory | Tight for the 8-bit MLX weights; close other apps | Tight; 50 steps make it slow |
| Apple Silicon · 24–32 GB unified memory | Recommended Mac start (mflux 8-bit) | Works; about three times slower than distilled |
| CPU only · 32 GB RAM | Not supported in practice: requires an NVIDIA GPU; use RunPod | Not supported in practice: requires an NVIDIA GPU; use RunPod |
Black Forest Labs also publishes NVFP4 files for RTX 50-series (Blackwell) GPUs and bf16 files for GPUs above 24 GB in the same repository.
Accept the license, place four files, open the official ComfyUI template and save your first image. Choose the distilled checkpoint for speed or the full checkpoint for maximum quality.
Select the weights you want. The instructions, downloads and settings change with your choice.
The publisher has not provided a complete memory target for this task. Check its hardware guidance before starting.
Black Forest Labs says the int8 files are meant for 8 GB GPUs such as the RTX 3070 and for cards without FP8 support; ComfyUI offloads what does not fit. 16 GB is a more comfortable estimate at 1024 × 1024. Above 24 GB you can switch to the bf16 files in the same repository.
Choose your computer first, then its GPU path. Follow the visual setup and import the linked workflow.
Mac: These int8 (convrot) files target NVIDIA GPUs, and neither Black Forest Labs nor the official ComfyUI guide documents running them on Apple Silicon. On a Mac, choose the MLX 8-bit (Mac) package instead; it runs with mflux. Compatibility source
Download ComfyUI Desktop for Windows with an NVIDIA GPU and install it. If you already have it, update it: the FLUX.3 Klein templates need ComfyUI 0.41.0 or later. Desktop asks where to keep your models; this guide assumes the default Documents\ComfyUI folder.
Download ComfyUI Desktop Official FLUX.3 Klein ComfyUI guideThe files are in a gated repository. Sign in to Hugging Face, open the repository below and choose Agree and access repository. Without this step every download link returns an error. The FLUX Kommunity License allows non-commercial use, and commercial use of outputs for individuals and companies under US$5M annual revenue; read it before using images commercially.
black-forest-labs/flux-3-image-klein-comfy FLUX Kommunity LicenseWhile signed in to Hugging Face in your browser, download each file and move it into the matching folder under Documents\ComfyUI/models. Keep the exact filenames. The template runs the prompt upsampler to expand short prompts; Black Forest Labs says to keep it on.
Restart ComfyUI so it sees the new files. Then either open Templates and search for “FLUX 3 Klein” and choose FLUX 3 Image Klein Distilled: Text to Image, or download the workflow JSON below and drag it onto the canvas. These are two ways to load the same graph; use one. If nodes are red or the template is missing, your ComfyUI is older than 0.41.0.
Download the workflow JSON Template details in the ComfyUI guideEnter a short prompt in the positive prompt box. Keep the template’s 16 steps and CFG 1, and a 1024 × 1024 square. enable_prompt_upsampler is on by default and expands a short prompt before sampling. Turn it off only if you want your exact wording.
| Setting | Value |
|---|---|
| Model | flux3-image-klein-int8-convrot.safetensors |
| Resolution | 1024 × 1024 |
| Steps | 16 |
| CFG | 1 |
| Prompt upsampler | On |
| Example prompt | A red fox asleep inside an open vintage leather suitcase, soft window light, shallow depth of field |
Click Queue (Run). When it finishes, the image appears in the Save Image node and is written to Documents\ComfyUI/output as a PNG. Open that file to check it: the fox, the suitcase and the lighting should match the prompt. Change the seed to get a different image with the same settings.
ComfyUI finishes the queue and a PNG matching your prompt appears in the output folder. Re-run with a new seed to confirm the setup is repeatable.
Files, folders, template names and settings come from the official ComfyUI guide and Black Forest Labs’ repository, checked November 9, 2026. YouRunAI has not rendered with this setup.
Sign in to Hugging Face and accept the license on the flux-3-image-klein-comfy page, then download again in the same browser.
Update ComfyUI to 0.41.0 or later and restart it. Check the filenames exactly match the listed files.
Close other GPU apps, keep 1024 × 1024, use the distilled checkpoint, and make sure ComfyUI is not started with --highvram.
Original instructions, model files, and compatibility notes behind this setup.
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