FLUX 1.1 Pro

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

Black Forest Labs' flagship text-to-image model. Faster generation than FLUX.1 Pro at higher prompt adherence, with strong photorealism and reliable spatial composition. Runs as a hosted Replicate model.

Price
$0.048/image
Aspect ratios
1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3
Input โ†’ output
Text โ†’ Image
Developer
Black Forest Labs
Updated
September 23, 2026
01

Playground

Try FLUX 1.1 Pro

Input & output

$0.048/image
Try FLUX 1.1 Pro

0 / 2,000

What to generate

Advanced settings (4)

Optional seed for reproducibility

Output
Your image appears here.

This run

$0.048 ยท 4.8 credits

For accounts without a purchase: runs above 2 credits need a top-up.

New here?

10 free credits ($0.10) when you sign up with Google

Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.

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 1.1 Pro: black forest gateau cake spelling out the words "FLUX 1 . 1 Pro", tasty, food photographyOpen full size

    Prompt

    black forest gateau cake spelling out the words "FLUX 1 . 1 Pro", tasty, food photography

    Settings

    aspect_ratio
    1:1
  • Example output 2 from FLUX 1.1 Pro: a beautiful mystical landscape photo with the text "FLUX 1.1 [Pro]", subtle beauty, must say "1.1", incorporate blueberriesOpen full size

    Prompt

    a beautiful mystical landscape photo with the text "FLUX 1.1 [Pro]", subtle beauty, must say "1.1", incorporate blueberries

    Settings

    aspect_ratio
    1:1
  • Example output 3 from FLUX 1.1 Pro: black forest gateau cake spelling out the words "FLUX 1.1 Pro", tasty, food photographyOpen full size

    Prompt

    black forest gateau cake spelling out the words "FLUX 1.1 Pro", tasty, food photography

    Settings

    aspect_ratio
    1:1
03

About FLUX 1.1 Pro

TL;DRAs of September 23, 2026

FLUX 1.1 Pro is a model by Black Forest Labs in the Image generation category. On Railwail, FLUX 1.1 Pro costs $0.048 per image. Supported aspect ratios: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, and 2:3.

FLUX 1.1 Pro is the production-grade member of the FLUX family from Black Forest Labs, the team formed by the original Stable Diffusion authors. It improves on FLUX.1 Pro with roughly 3x faster inference, better prompt following, and fewer anatomy and text artifacts. Output resolution is controlled via aspect ratio rather than a fixed grid.
04

Pricing

Prices in US dollars. Usage is charged from prepaid credits.
Per image$0.048 per image
  • 1 credit = $0.01

Cost calculator

Price calculator

Total

$4.80

480 credits

Per run

$0.048 ยท 4.8 credits

Fixed price per run, known before the run starts.

05

API

Call FLUX 1.1 Pro with your Railwail API key. Use this model ID in the request:
curl https://railwail.com/api/v1/images/generations \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux-1-1-pro",
    "prompt": "A lighthouse on a rocky coast at sunset, photorealistic"
  }'
Set your key as RAILWAIL_API_KEYCreate API key
06

Specifications

Model ID
flux-1-1-pro
Input
Text
Output
Image
Output formats
WEBP, PNG, JPG
Aspect ratios
1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3
Billing
Fixed price, known before the run
Catalog entry updated
September 23, 2026

Input parameters

Inputs and settings from the model's input schema. The example in the API section shows which of them the API accepts.

  • seed

    Optional seed for reproducibility

    Type: Integer
    Default: โ€“
    Allowed values: โ€“
  • prompt

    What to generate

    Type: Text
    Default: โ€“
    Allowed values: up to 2,000 characters
  • aspect_ratio
    Type: Choice
    Default: 1:1
    Allowed values: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, or 2:3
  • output_format
    Type: Choice
    Default: webp
    Allowed values: webp, png, or jpg
  • output_quality
    Type: Integer
    Default: 80
    Allowed values: 1 to 100
  • safety_tolerance
    Type: Integer
    Default: 2
    Allowed values: 1 to 6

Tags

  • replicate
  • flux
  • black-forest-labs
  • text-to-image
  • photorealism
  • flagship
07

Use cases

08

Frequently asked questions

What is FLUX 1.1 Pro?

FLUX 1.1 Pro is a model by Black Forest Labs in the Image generation category. On Railwail you can call it with an API key through the Railwail API.

How much does FLUX 1.1 Pro cost on Railwail?

On Railwail, FLUX 1.1 Pro costs $0.048 per image. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals $0.01.

Which settings does FLUX 1.1 Pro support?

According to its input schema, FLUX 1.1 Pro knows these parameters: seed, prompt (up to 2,000 characters), aspect_ratio (1:1, 16:9, 9:16, 4:3, 3:4, 3:2, or 2:3), output_format (webp, png, or jpg), output_quality (1 to 100), and safety_tolerance (1 to 6).

How fast is FLUX 1.1 Pro?

There are not enough measured runs of FLUX 1.1 Pro on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is FLUX 1.1 Pro better than Flux 1.1 Pro Ultra?

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

Compare FLUX 1.1 Pro and Flux 1.1 Pro Ultra

How do I use FLUX 1.1 Pro through the API?

Create a Railwail API key and send your request with the model ID flux-1-1-pro. Code examples for curl, Python and JavaScript are in the API section of this page.

09

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Use FLUX 1.1 Pro via the API

One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = $0.01.