FLUX 1.1 Pro
flux-1-1-proBlack 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
Playground
Try FLUX 1.1 Pro
Input & output
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.
Examples
Open full sizePrompt
black forest gateau cake spelling out the words "FLUX 1 . 1 Pro", tasty, food photography
Settings
- aspect_ratio
- 1:1
Open full sizePrompt
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
Open full sizePrompt
black forest gateau cake spelling out the words "FLUX 1.1 Pro", tasty, food photography
Settings
- aspect_ratio
- 1:1
About FLUX 1.1 Pro
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.
Pricing
| 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.
API
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"
}'import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["RAILWAIL_API_KEY"],
base_url="https://railwail.com/api/v1",
)
image = client.images.generate(
model="flux-1-1-pro",
prompt="A lighthouse on a rocky coast at sunset, photorealistic",
)
print(image.data[0].url)import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.RAILWAIL_API_KEY,
baseURL: "https://railwail.com/api/v1",
});
const image = await client.images.generate({
model: "flux-1-1-pro",
prompt: "A lighthouse on a rocky coast at sunset, photorealistic"
});
console.log(image.data[0].url);// npm install railwail
import railwail from "railwail";
const rw = railwail(process.env.RAILWAIL_API_KEY);
const res = await rw.image("flux-1-1-pro", "A lighthouse on a rocky coast at sunset, photorealistic");
console.log(res.data[0].url);Specifications
- Model ID
flux-1-1-pro- Developer
- Black Forest Labs
- Category
- Image generation
- 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.
seedOptional seed for reproducibility
Type: IntegerDefault: โAllowed values: โpromptWhat to generate
Type: TextDefault: โAllowed values: up to 2,000 charactersaspect_ratioType: ChoiceDefault:1:1Allowed values: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, or 2:3output_formatType: ChoiceDefault:webpAllowed values: webp, png, or jpgoutput_qualityType: IntegerDefault:80Allowed values: 1 to 100safety_toleranceType: IntegerDefault:2Allowed values: 1 to 6
Tags
- replicate
- flux
- black-forest-labs
- text-to-image
- photorealism
- flagship
Use cases
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 UltraHow 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.
Comparable models
All in this category- Flux 1.1 Pro UltraBlack Forest Labs
FLUX 1.1 Pro in ultra mode. Up to 4 megapixel images with raw mode for photorealism.
- Flux DevBlack Forest Labs
Black Forest Labs' development model. Fast, high-quality image generation with LoRA support.
- Google Imagen 4Google DeepMind
Google DeepMind's Imagen 4 text-to-image model, hosted on Replicate. Sharp detail, accurate text rendering, and strong prompt adherence across photographic and illustrated styles. Outputs up to 2K resolution.
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.