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    Flux.1-Schnell Merged with Flux.1-Dev bnb-nf4 Fp8 4 steps - Unet-bnb-nf4
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    Unet (without clips ans vae) bnb-nf4 version of the merge of Flux.1-schnell and Flux.1-Dev

    Comfyui node for unet nf4:

    https://github.com/DenkingOfficial/ComfyUI_UNet_bitsandbytes_NF4

    I used the tip from comfy.org for merging just the Flux.1-Dev double_blocks (MM-DiT) onto Flux.1-Schnell, giving you a higher quality model that still runs in just 4 steps!
    https://blog.comfy.org/august-2024-flux-support-new-frontend-for-loops-and-more/

    All in one:

    Clips(t5xxlfp16, L) and vae are included, you can put it in comfyui checkpoint folder and use comfyui default WF

    Work with Forge 2.0.1

    Description

    This is the Unet (without clips ans vae) bnb-nf4 version of the merge of Flux.1-schnell and Flux.1-Dev

    FAQ

    Comments (26)

    barry9000Aug 25, 2024· 1 reaction
    CivitAI

    Your previews look incredible for the UNET only model (flux1SchnellMergedWith_unetBnbNf4.safetensors), but I keep getting error when trying to load it in ComfyUI: ERROR: Could not detect model type

    I've tried all the different checkpoint loaders (including CheckpointLoaderNF4), using separate DualCLIPLoader and Load VAE nodes. Keep getting that same error regardless. FYI, I'm able to successfully load/run other Flux Schnell and Dev models and merges without issue, so I'm not sure what the issue is. Could you maybe provide a simple ComfyUI workflow that you've verified works for you?

    jice
    Author
    Aug 25, 2024

    not tested on comfyui, working good with Forge

    jice
    Author
    Aug 25, 2024· 1 reaction

    @barry9000 I just looked, the comfyui nf4 loader does not support the unet version without clips and vae, only the all in one (clips and vae included) nf4 version, sorry
    Open a issue to comfyui github.
    https://github.com/comfyanonymous/ComfyUI_bitsandbytes_NF4/issues/44

    barry9000Aug 25, 2024

    @jice Understood, thanks for the update.

    barry9000Aug 25, 2024· 1 reaction

    @jice I've got Forge installed, I just rarely use it. Loaded your model successfully in Forge and results are amazing. Thanks for sharing the model.

    Giovecivitai1Aug 25, 2024
    CivitAI

    A GGUF version is possible?

    jice
    Author
    Aug 25, 2024

    Sorry i dont know how to make gguf, i try to learn

    RanshansSep 20, 2024

    Using stable-difusiónCPP project is actually posible transform to gguf and make a quantization

    dongxiatAug 28, 2024
    CivitAI

    if have BnB in the filename its mean (vae, clip-l,t5xxl) is baked and without Bnb means only model Unet, right?

    jice
    Author
    Aug 28, 2024· 2 reactions

    @dongxiat No, BitsAndBytes (bnb) is a library optimized for manipulating model weights with low precision, particularly for deep learning. It allows models to be run using more compact representations (such as 8-bit or 4-bit) without significantly sacrificing model performance. So it has nothing to do with whether the clips are present or not.

    jojapormsAug 31, 2024
    CivitAI

    I keep getting this: ERROR: Could not detect model type

    Updated and everything, got the other flux models working except for this.

    jice
    Author
    Aug 31, 2024

    @jojaporms Look at description, i give the link for the node

    metaltakaki9432Sep 18, 2024· 1 reaction
    CivitAI

    I'm looking for like this checkpoint for flux!!!

    Thanks!!

    SujalronNov 11, 2024· 1 reaction
    CivitAI

    bro please remove login only download i am downloading it from cmd and i need it often

    SujalronNov 11, 2024
    CivitAI

    bro can you make nf4 of flux d lite alpha , i tried but it did not work

    jice
    Author
    Nov 11, 2024

    No sorry

    SujalronNov 13, 2024

    @jice oki

    knfelNov 30, 2024
    CivitAI

    Hello :D Does anyone know how I can make the loras work?

    mrkhusbuFeb 24, 2025
    CivitAI

    I got problem ForgeUI "OperationalError: no such column: "size" - should this be a string literal in single-quotes?"

    jice
    Author
    Feb 24, 2025

    the problem is not the checkpoint: https://github.com/lllyasviel/stable-diffusion-webui-forge/issues/2669#issuecomment-2670889693 A1111 has the same probleme, is a libsqlite 3.49.1 issue, go back to 3.47.2

    arabeskdunya131Apr 25, 2025
    CivitAI

    based on SDXL 1.0? or another?

    jice
    Author
    Apr 25, 2025

    Based on Flux.1-Schnell and Flux.1-Dev

    dilectiogamesNov 4, 2025
    CivitAI

    it works great on 6Gb VRAM and forge and is even faster than SDXL. but I've noticed the images have some sort of artifacts and are slightly less defined than your examples. I've narrowed down the issue to the fact that I believe I have a different T5 text encoder. Do you still have the link to the text encoder you are using?

    X4Lch3mistApr 25, 2026
    CivitAI

    I can't get it to work. 😪

    Checkpoint
    Flux.1 D
    by jice

    Details

    Downloads
    5,217
    Platform
    CivitAI
    Platform Status
    Available
    Created
    8/24/2024
    Updated
    5/20/2026
    Deleted
    -

    Files

    flux1SchnellMergedWithFlux_unetBnbNf4.safetensors

    Available On (1 platform)

    Same model published on other platforms. May have additional downloads or version variants.