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FLUX.1 Redux

Image generationAvailable
by Black Forest LabsModel ID: flux-1-redux

FLUX image-variation adapter. Generate variations and remixes from a reference image.

Try itGet API keyCompare
Price
US$0.0036/image
Input → output
Text → Image
Developer
Black Forest Labs
Updated
September 23, 2026
01

Playground

Try FLUX.1 Redux

No input form

US$0.0036/image

No input form for this model yet

Its inputs are not documented yet. So that no run fails on a wrong input, we don't offer a form here. Pick a comparable model instead.

02

Examples

Real outputs from the public examples of this model on Replicate, with the prompt and settings that produced them. They were not generated live on this page.
  • Example output 1 from FLUX.1 ReduxOpen full size
    InputInput

    No text prompt: the model only takes the input shown.

    Settings

    aspect_ratio
    3:2
  • Example output 2 from FLUX.1 ReduxOpen full size
    InputInput

    No text prompt: the model only takes the input shown.

    Settings

    aspect_ratio
    1:1
03

About FLUX.1 Redux

TL;DRAs of September 23, 2026

FLUX.1 Redux is a model by Black Forest Labs in the Image generation category. On Railwail, FLUX.1 Redux costs US$0.0036 per image.

Background

About Black Forest Labs

Founded 2024 · Freiburg, Germany

Black Forest Labs was founded in August 2024 in Freiburg, Germany by Robin Rombach, Patrick Esser, Andreas Blattmann and Dominik Lorenz, the original Stable Diffusion team. After raising a $31M seed round led by Andreessen Horowitz, the lab released the FLUX.1 family (pro, dev, schnell) and the FLUX.1 Tools (Fill, Canny, Depth, Redux). Their mission is to be the leading European open foundation-model lab for generative media.

Visit Black Forest Labs

Architecture

Rectified-flow DiT with image-embedding (Redux) conditioning for variation

FLUX.1 Redux is the image-to-image variation model in the FLUX.1 Tools suite. Rather than ControlNet-style structural conditioning, Redux uses an image encoder (a SigLIP-style vision transformer) to extract a dense embedding of the input image, which is then injected into the FLUX.1 DiT alongside the text embeddings via cross-attention. This is conceptually similar to IP-Adapter and Stable Diffusion's 'unCLIP': the result is a new image that captures the style, palette and high-level composition of the input but is regenerated from noise, producing diverse variations. Optionally a text prompt can steer the variation toward a different style or composition. The base backbone is the standard FLUX.1 rectified-flow DiT with T5-XXL and CLIP-L text encoders and a 16x VAE, sampled in 28-50 flow-matching steps.

Parameters
~12B (FLUX.1 dev backbone) plus image-encoder adapter
Context
512 tokens

Capabilities

  • Image-to-image variation conditioned on a reference image
  • Optional text prompt to steer style or content of variations
  • Preserves overall composition and palette while regenerating details
  • Up to 2 MP output
  • Compatible with FLUX Tools Fill/Canny/Depth pipelines
  • Good for unCLIP-style 'more like this' workflows
  • Best for: design exploration, A/B variants, mood-board expansion, style-transfer-lite.

Training & license

Fine-tuned from FLUX.1 base weights using paired references and image-text data, with a SigLIP-style image encoder trained or adapted to produce conditioning embeddings.

License: FLUX.1 Redux [dev] under the FLUX.1 [dev] non-commercial license; FLUX.1 Redux [pro] via API for commercial use.

Safety testing: Inherits FLUX.1 family safety filters; additional checks for NCII and IP-protected reference images.

Known limitations

  • Not pixel-faithful — output differs from reference
  • Cannot perform precise edits (use Fill for that)
  • Dev weights non-commercial only
  • Tends to homogenise unusual reference styles toward FLUX defaults

Research papers

04

Pricing

Prices in US dollars. Usage is charged from prepaid credits.
Per imageUS$0.0036 per image
  • 1 credit = US$0.01

Cost calculator

Price calculator

/ run

Total

US$0.36

36 credits

Per run

US$0.0036 · 0.36 credits

Fixed price per run, known before the run starts.

05

API

Call FLUX.1 Redux with your Railwail API key. Use this model ID in the request:
flux-1-reduxAPI documentationGet an API key

No verified API example

The inputs of this model are not documented yet.

06

Specifications

Model ID
flux-1-redux
Developer
Black Forest Labs
Category
Image generation
Input
Text
Output
Image
Billing
Fixed price, known before the run
Model size
~12B (FLUX.1 dev backbone) plus image-encoder adapter
License
FLUX.1 Redux [dev] under the FLUX.1 [dev] non-commercial license; FLUX.1 Redux [pro] via API for commercial use.
Catalog entry updated
September 23, 2026

Tags

  • flux
  • black-forest-labs
  • image-edit
  • variation
  • image-to-image
  • remix
07

Use cases

What it is used for

  • Design exploration and mood-board expansion
  • A/B creative variants from a single hero image
  • Style transfer lite
  • Brand-asset variation generation
  • Concept-art iteration
  • Photo-collection coherence
08

Frequently asked questions

What is FLUX.1 Redux?

FLUX.1 Redux is a model by Black Forest Labs in the Image generation category.

How much does FLUX.1 Redux cost on Railwail?

On Railwail, FLUX.1 Redux costs US$0.0036 per image. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals US$0.01.

How fast is FLUX.1 Redux?

There are not enough measured runs of FLUX.1 Redux on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is FLUX.1 Redux better than FLUX 1.1 Pro?

That depends on the task. FLUX.1 Redux (Black Forest Labs) and FLUX 1.1 Pro (Black Forest Labs) are both models in the Image generation category. The comparison page shows their prices and specifications side by side.

Compare FLUX.1 Redux and FLUX 1.1 Pro
09

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