Seedream 4
seedream-4ByteDance's unified text-to-image generation and editing model with up to 4K resolution.
- Price
- US$0.036/image
- Aspect ratios
- 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9
- Resolution
- 1K, 2K, 4K
- Input โ output
- Text โ Image
- Developer
- ByteDance
- Updated
- September 24, 2026
Playground
Try Seedream 4
Input & output
This run
US$0.036 ยท 3.6 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
a photo of a store front called "Seedream 4", it sells books, a poster in the window says "Seedream 4 now on Replicate"
Settings
- aspect_ratio
- 4:3
- width
- 2048
- height
- 2048
- size
- 2K
Open full size
InputPrompt
a selection of photos of this woman looking at a store front and perusing a book shop that's called "Seedream 4", it sells books, a poster in the window says "Seedream 4 now on Replicate"
Settings
- aspect_ratio
- 4:3
- width
- 2048
- height
- 2048
- size
- 2K
About Seedream 4
Seedream 4 is a model by ByteDance in the Image generation category. On Railwail, Seedream 4 costs US$0.036 per image. Supported aspect ratios: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3 and 21:9.
Pricing
| Per image | US$0.036 per image |
|---|
- 1 credit = US$0.01
Cost calculator
Price calculator
Total
US$3.60
360 credits
Per run
US$0.036 ยท 3.6 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": "seedream-4",
"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="seedream-4",
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: "seedream-4",
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("seedream-4", "A lighthouse on a rocky coast at sunset, photorealistic");
console.log(res.data[0].url);Specifications
- Model ID
seedream-4- Developer
- ByteDance
- Category
- Image generation
- Input
- Text
- Output
- Image
- Aspect ratios
- 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9
- Resolution
- 1K, 2K, 4K
- Billing
- Fixed price, known before the run
- Catalog entry updated
- September 24, 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: โsizeType: ChoiceDefault:2KAllowed values: 1K, 2K or 4KaspectRatioType: ChoiceDefault:1:1Allowed values: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3 or 21:9
Tags
- replicate
- bytedance
- text-to-image
Use cases
Frequently asked questions
What is Seedream 4?
Seedream 4 is a model by ByteDance in the Image generation category. On Railwail you can call it with an API key through the Railwail API.
How much does Seedream 4 cost on Railwail?
On Railwail, Seedream 4 costs US$0.036 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 Seedream 4 support?
According to its input schema, Seedream 4 knows these parameters: prompt, size (1K, 2K or 4K) and aspectRatio (1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3 or 21:9).
How fast is Seedream 4?
There are not enough measured runs of Seedream 4 on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.
Is Seedream 4 better than FLUX 1.1 Pro?
That depends on the task. Seedream 4 (ByteDance) 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 Seedream 4 and FLUX 1.1 ProHow do I use Seedream 4 through the API?
Create a Railwail API key and send your request with the model ID seedream-4. 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 Seedream 4 via the API
One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = US$0.01.