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/IMAGE/Seedream/seedream-4-5
Image
ByteDance

Seedream 4.5 API

Generate and edit detailed images from prompts and reference images.

  • Text to image
  • Image editing
Try modelGet API KeyDocumentation

Starting at

$0.036

per generation

10% cheaper than fal.ai
6 parameters · 1 price options

Seedream 4.5 playground

Input

Text description for image generation

Reference images as complete HTTP(S) URLs or base64 data:image URIs for image-to-image mode

Sign in to run

Runs are charged to your balance.

Output

Output will appear here.

Check the price and run the model. Your result will appear here; browser use does not need an API key.

Seedream 4.5 API pricing

OptionPrice per generationfal.aiYour savings
Standard$0.036$0.04−10%

Quick start

Full API reference →
1curl -X POST https://api.api-stock.com/api/v1/generation/create \
2  -H "Authorization: Bearer $API_STOCK_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{
5    "model": "seedream-4-5",
6    "input": {
7      "prompt": "A cinematic shot of a city at dusk",
8      "size": "1:1",
9      "resolution": "2K",
10      "outputFormat": "jpeg",
11      "promptOptimizeMode": "standard"
12    }
13  }'

Parameters

NameTypeRequiredDefaultDescription
promptstringYes—Text description for image generation
urlsstring[]No—Reference images as complete HTTP(S) URLs or base64 data:image URIs for image-to-image mode
sizestringNo1:1Image aspect ratioOne of: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9, 9:21, auto
resolutionstringNo2KImage resolutionOne of: 2K, 4K
outputFormatstringNojpegOutput image format (Seedream 5.0 Lite / Pro / Flash only; ignored by other models)One of: jpeg, png
promptOptimizeModestringNostandardPrompt optimization mode (seedream-4-5 only; ignored by other models)One of: standard, fast

Frequently asked questions

How much does Seedream 4.5 cost?

Seedream 4.5 starts at $0.036 per generation on API Stock. The final charge depends on the selected settings.

When was Seedream 4.5 released?

Seedream 4.5 was released on December 3, 2025 and is available through API Stock.

How do I get an API key for Seedream 4.5?

Create an account and API key on API Stock, then fund your balance. The same key works with Seedream 4.5 and other catalog models.

How do I call the Seedream 4.5 API?

POST to https://api.api-stock.com/api/v1/generation/create with your API key and model "seedream-4-5". Use the returned task id for polling or receive a webhook.

What input parameters does Seedream 4.5 accept?

Seedream 4.5 accepts 6 input parameters, including the required field(s) prompt. See their types, defaults and allowed values above.

What happens if a Seedream 4.5 request fails?

API Stock automatically retries the request on a reserve provider. If every provider fails, the charge is refunded to your balance.

Can I use Seedream 4.5 with the same API key as other models?

Yes. Use your API Stock API key and balance for Seedream 4.5 and other catalog models.

Other Image models

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