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Open-weight model · Image to image

FLUX.2-small-decoder

by Black Forest Labs black-forest-labs/FLUX.2-small-decoder

FLUX.2-small-decoder is an open-weight model for image to image from Black Forest Labs, released under Apache License 2.0. It has 62M parameters. At 16-bit it needs about 0.1 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index. It draws 218.2k downloads a month.

FLUX.2 Small Decoder is a distilled VAE decoder that serves as a drop-in replacement for the standard FLUX.2 decoder. It delivers faster decoding and lower VRAM usage with minimal to zero quality loss. The encoder remains unchanged. 1.

Parameters62M
Context—
Weights610.8 MB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads218.2k

Runs On

What it takes to serve FLUX.2-small-decoder (62M parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.

PrecisionWeightsMemory neededCheapest setupPer hourAlso fits
16-bit 0.1 GB 0.1 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 0.1 GB 0.1 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 0.0 GB 0.0 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00

Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Oct 10, 2026.

FLUX.2-small-decoder on every accelerator the SAVRN Index prices, at every precision

Model Card

By Black Forest Labs, published under apache-2.0, revision a3efc24f613e.

FLUX.2 Small Decoder is a distilled VAE decoder that serves as a drop-in replacement for the standard FLUX.2 decoder. It delivers faster decoding and lower VRAM usage with minimal to zero quality loss. The encoder remains unchanged.

Key Features

  1. ~1.4x faster decoding compared to the full decoder.
  2. ~1.4x less VRAM at decode time, enabling higher resolutions without running out of memory.
  3. ~28M decoder parameters (vs ~50M in the full decoder) thanks to narrower channel widths ([96, 192, 384, 384] vs [128, 256, 512, 512]).
  4. Minimal quality loss — images are almost identical.
  5. Available under the Apache 2.0 license.

Compatible with all open FLUX.2 models: - FLUX.2-klein-4B - FLUX.2-klein-9B - FLUX.2-klein-9b-kv - FLUX.2-dev

Comparison

Full Decoder Small Decoder

Usage

pip install git+https://github.com/huggingface/diffusers.git

Read the full model card (402 words)

Identity and Version

Repository
black-forest-labs/FLUX.2-small-decoder
Publisher
Black Forest Labs
Task
Image to image
Modality
Image
Library
diffusers
Parameters
62M parameters
Languages
en
Revision
a3efc24f613ef42d9428af62fdbd6f5fd8856c4a
First published
2026-04-06
Last updated
2026-04-07

Files and Weights

10 files, 619.4 MB in total. The weights are 3 files totalling 610.8 MB in safetensors.

Weights3 files · 610.8 MB
Configuration1 file · 842 B
Documentation1 file · 3.9 KB
Other4 files · 8.5 MB
Repository1 file · 1.7 KB
Every file
FileTypeSizeSHA-256
diffusion_pytorch_model.safetensorsWeights249.5 MB d8d52ba03647
full_encoder_small_decoder.safetensorsWeights249.5 MB ea4273f02d1f
small_decoder.safetensorsWeights111.8 MB ad7833477475
config.jsonConfiguration842 B —
README.mdDocumentation3.9 KB —
compare_full_decoder.pngOther1.2 MB 188624cc1d06
compare_small_decoder.pngOther1.3 MB 3ceccc1bea55
comparison_panel.jpegOther3.5 MB ea01b25d80d3
editing.jpgOther2.5 MB 2912ca5a7cb9
.gitattributesRepository1.7 KB —

License and Download

License
apache-2.0
Access
Open weights, no gate
Download size
610.8 MB
Download from Black Forest Labs

Released by Black Forest Labs through its official repository on Hugging Face. Read the license.

Memory Requirements

PrecisionWeights in memory
As published610.8 MB
16-bit0.1 GB
8-bit0.1 GB
4-bit0.0 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Questions About FLUX.2-small-decoder

How much GPU memory does FLUX.2-small-decoder need?

About 0.1 GB at 16-bit and 0 GB at 4-bit: the weights (62M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run FLUX.2-small-decoder on?

At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.

Can I use FLUX.2-small-decoder commercially?

Yes. FLUX.2-small-decoder is released under Apache License 2.0. The Apache License 2.0 is a permissive open-source license. It permits commercial use, modification and redistribution. It requires keeping the license and copyright notices and any NOTICE file, stating significant changes, and it includes an express patent grant from contributors.

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