> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.
# ComfyUI Flux.2 Klein 4B Guide
> A quick introduction to FLUX.2 [klein] 4B and how to run text-to-image and image editing workflows in ComfyUI.
## About FLUX.2 \[klein]
FLUX.2 \[Klein] is the fastest model in the Flux family, unifying text-to-image and image editing in one compact architecture. Itβs designed for interactive workflows, immediate previews, and latency-critical applications, with distilled variants delivering end-to-end inference around one second while keeping strong quality for single- and multi-reference editing.
**Model highlights:**
* Two 4B types: Base (undistilled) for maximum flexibility and fine-tuning; Distilled (4-step) for speed-first deployments
* Performance: distilled \~1.2s (5090) Β· 8.4GB VRAM; base \~17s (5090) Β· 9.2GB VRAM
* Editing support: style transforms, semantic edits, object replacement/removal, multi-reference composition, iterative edits
Make sure your ComfyUI is updated.
* [Download ComfyUI](https://www.comfy.org/download)
* [Update Guide](/installation/update_comfyui)
Workflows in this guide can be found in the [Workflow Templates](/interface/features/template).
If you can't find them in the template, your ComfyUI may be outdated. (Desktop version's update will delay sometime)
If nodes are missing when loading a workflow, possible reasons:
1. You are not using the latest ComfyUI version (Nightly version)
2. Some nodes failed to import at startup
* The Desktop is base on ComfyUI stable release, it will auto-update when there is a new Desktop stable release available.
* [Cloud](https://cloud.comfy.org) will update after ComfyUI stable release.
So, if you find any core node missing in this document, it might be because the new core nodes have not yet been released in the latest stable version. Please wait for the next stable release.
## Flux.2 Klein 4B Workflows
Download the text-to-image workflow for Flux.2 Klein 4B.
Download the image editing workflow using the 4B base model.
Download the fast distilled 4B image editing workflow.
## Flux.2 Klein 4B Model Downloads
Text encoder for 4B models.
Diffusion model (4B base).
Diffusion model (4B distilled).
VAE for 4B models.
**4B Model Storage Location**
```
π ComfyUI/
βββ π models/
β βββ π text_encoders/
β β βββ qwen_3_4b.safetensors
β βββ π diffusion_models/
β β βββ flux-2-klein-base-4b-fp8.safetensors
β β βββ flux-2-klein-4b-fp8.safetensors
β βββ π vae/
β βββ flux2-vae.safetensors
```
## Flux.2 Klein 9B Workflows
Download the text-to-image workflow for Flux.2 Klein 9B.
Download the image editing workflow using the 9B base model.
Download the fast distilled 9B image editing workflow.
## Flux.2 Klein 9B Model Downloads
For diffusion models, please visit BFL's repo, accept the agreement, and then download the models.
Diffusion model (9B base).
Diffusion model (9B distilled).
Text encoder for 9B models.
VAE for 9B models.
**9B Model Storage Location**
```
π ComfyUI/
βββ π models/
β βββ π diffusion_models/
β β βββ flux-2-klein-9b-fp8.safetensors
β β βββ flux-2-klein-base-9b-fp8.safetensors
β βββ π text_encoders/
β β βββ qwen_3_8b_fp8mixed.safetensors
β βββ π vae/
β βββ flux2-vae.safetensors
```