Seedream 4.5
seedream-4-5ByteDance Seedream 4.5: upgraded image generation and editing with stronger spatial understanding and world knowledge.
- Price
- US$0.048/image
- Aspect ratios
- 1:1, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 3:2, 2:3, 21:9, 9:21
- Resolution
- 2K, 4K
- Input → output
- Text → Image
- Developer
- ByteDance
- Updated
- September 24, 2026
Playground
Try Seedream 4.5
Input & output
This run
US$0.048 · 4.8 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 warm, nostalgic film-style interior of a cozy café, shot on 35mm-inspired digital photography with soft afternoon sunlight filtering through the front windows. Wooden shelves display neatly arranged ceramics, pastries, and coffee beans. Hand-painted signage on the main interior window reads ‘Seedream 4.5’ in clean, classic lettering, similar to boutique branding. A vintage bicycle with a wicker basket is visible outside the entrance, casting soft shadows on the floor. Rich textures, natural light, warm tones, subtle grain, and calm neighborhood-café ambiance.
Settings
- aspect_ratio
- 16:9
- width
- 2048
- height
- 2048
- size
- 4K
Open full size
InputPrompt
new york
Settings
- aspect_ratio
- match_input_image
- size
- 2K
Open full sizePrompt
an abstract modern art painting of glass fruit, the glass shines with an iridescent flare, the fruit is transparent
Settings
- aspect_ratio
- match_input_image
- size
- 2K
About Seedream 4.5
Seedream 4.5 is a model by ByteDance in the Image generation category. On Railwail, Seedream 4.5 costs US$0.048 per image. Supported aspect ratios: 1:1, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 3:2, 2:3, 21:9 and 9:21.
Pricing
| Per image | US$0.048 per image |
|---|
- 1 credit = US$0.01
Cost calculator
Price calculator
Total
US$4.80
480 credits
Per run
US$0.048 · 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": "seedream-4-5",
"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-4-5",
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-4-5",
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-4-5", "A lighthouse on a rocky coast at sunset, photorealistic");
console.log(res.data[0].url);Specifications
- Model ID
seedream-4-5- Developer
- ByteDance
- Category
- Image generation
- Input
- Text
- Output
- Image
- Aspect ratios
- 1:1, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 3:2, 2:3, 21:9, 9:21
- Resolution
- 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: –Allowed values: –sizeType: ChoiceDefault:2KAllowed values: 2K or 4KaspectRatioType: ChoiceDefault:1:1Allowed values: 1:1, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 3:2, 2:3, 21:9 or 9:21
Tags
- replicate
- bytedance
- text-to-image
Use cases
Frequently asked questions
What is Seedream 4.5?
Seedream 4.5 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 4.5 cost on Railwail?
On Railwail, Seedream 4.5 costs US$0.048 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 4.5 support?
According to its input schema, Seedream 4.5 knows these parameters: prompt, size (2K or 4K) and aspectRatio (1:1, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 3:2, 2:3, 21:9 or 9:21).
How fast is Seedream 4.5?
There are not enough measured runs of Seedream 4.5 on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.
Is Seedream 4.5 better than FLUX 1.1 Pro?
That depends on the task. Seedream 4.5 (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 4.5 and FLUX 1.1 ProHow do I use Seedream 4.5 through the API?
Create a Railwail API key and send your request with the model ID seedream-4-5. 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 4.5 via the API
One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = US$0.01.