Seedream 4.5

Image generationNewAvailable
by ByteDanceModel ID: seedream-4-5

ByteDance 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
24 September 2026
01

Playground

Try Seedream 4.5

Input & output

US$0.048/image
Try Seedream 4.5
Advanced settings (1)
Output
Your image appears here.

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.

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 Seedream 4.5: A warm, nostalgic film-style interior of a cozy café, shot on 35mm-inspired digital photography with soft afternoon sunlight filtering throuOpen full size

    Prompt

    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
  • Example output 2 from Seedream 4.5: new yorkOpen full size
    InputInput

    Prompt

    new york

    Settings

    aspect_ratio
    match_input_image
    size
    2K
  • Example output 3 from Seedream 4.5: an abstract modern art painting of glass fruit, the glass shines with an iridescent flare, the fruit is transparentOpen full size

    Prompt

    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
03

About Seedream 4.5

TL;DRAs of 24 September 2026

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.

04

Pricing

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

Cost calculator

Price calculator

/ run

Total

US$4.80

480 credits

Per run

US$0.048 · 4.8 credits

Fixed price per run, known before the run starts.

05

API

Call Seedream 4.5 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": "seedream-4-5",
    "prompt": "A lighthouse on a rocky coast at sunset, photorealistic"
  }'
Set your key as RAILWAIL_API_KEYCreate API key
06

Specifications

Model ID
seedream-4-5
Developer
ByteDance
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
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.

  • promptrequired
    Type: Text
    Default: –
    Allowed values: –
  • size
    Type: Choice
    Default: 2K
    Allowed values: 2K or 4K
  • aspectRatio
    Type: Choice
    Default: 1:1
    Allowed 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
07

Use cases

08

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 Pro

How 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.

09

Comparable models

All in this category

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.