Flux Pro
flux-proState-of-the-art image generation with top of the line prompt following, visual quality, image detail and output diversity.
- Price
- US$0.066/image
- Aspect ratios
- 1:1, 16:9, 3:2, 2:3, 4:5, 5:4, 9:16, 3:4, 4:3
- Input โ output
- Text โ Image
- Developer
- Black Forest Labs
- Updated
- 24 September 2026
Playground
Try Flux Pro
Input & output
This run
US$0.066 ยท 6.6 credits
For accounts without a purchase: runs above 2 credits need a top-up.
New here?
10 free credits (US$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
The world's largest black forest cake, the size of a building, surrounded by trees of the black forest
Settings
- width
- 1024
- height
- 1024
Open full sizePrompt
Elevated view of a quaint 18th-century German village in the Black Forest, captured with a fisheye lens. The scene shows a group of cheerful villagers in period attire gathered in the town square, enjoying slices of Black Forest cake and mugs of beer. The distorted wide-angle view encompasses thatched-roof houses, surrounding forest, and perhaps a church spire, giving a sense of the village nestled in the broader landscape.
Settings
- width
- 1024
- height
- 512
Open full sizePrompt
A dark-haired woman in her early thirties playing the piano accordion in the middle of an octagonal wooden dance floor with a wooden roof in the swedish forest, surrounded by dancers dancing in pairs
Settings
- width
- 1024
- height
- 1024
About Flux Pro
Flux Pro is a model by Black Forest Labs in the Image generation category. On Railwail, Flux Pro costs US$0.066 per image. Supported aspect ratios: 1:1, 16:9, 3:2, 2:3, 4:5, 5:4, 9:16, 3:4 and 4:3.
Pricing
| Per image | US$0.066 per image |
|---|
- 1 credit = US$0.01
Cost calculator
Price calculator
Total
US$6.60
660 credits
Per run
US$0.066 ยท 6.6 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-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-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-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-pro", "A lighthouse on a rocky coast at sunset, photorealistic");
console.log(res.data[0].url);Specifications
- Model ID
flux-pro- Developer
- Black Forest Labs
- Category
- Image generation
- Input
- Text
- Output
- Image
- Aspect ratios
- 1:1, 16:9, 3:2, 2:3, 4:5, 5:4, 9:16, 3:4, 4:3
- Billing
- Fixed price, known before the run
- Catalog entry updated
- 24 September 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.
promptrequiredType: TextDefault: โAllowed values: โaspectRatioType: ChoiceDefault: โAllowed values: custom, 1:1, 16:9, 3:2, 2:3, 4:5, 5:4, 9:16, 3:4 or 4:3
Tags
- replicate
- black-forest-labs
- text-to-image
Use cases
Frequently asked questions
What is Flux Pro?
Flux 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 Pro cost on Railwail?
On Railwail, Flux Pro costs US$0.066 per image. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals US$0.01.
Which settings does Flux Pro support?
According to its input schema, Flux Pro knows these parameters: prompt and aspectRatio (custom, 1:1, 16:9, 3:2, 2:3, 4:5, 5:4, 9:16, 3:4 or 4:3).
How fast is Flux Pro?
There are not enough measured runs of Flux Pro on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.
Is Flux Pro better than FLUX 1.1 Pro?
That depends on the task. Flux Pro (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 Pro and FLUX 1.1 ProHow do I use Flux Pro through the API?
Create a Railwail API key and send your request with the model ID flux-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 ProBlack Forest Labs
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.
- 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.
Use Flux Pro via the API
One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = US$0.01.