Seedream 4.5 API

Use Seedream 4.5 API to turn prompts and reference photos into scroll‑stopping 4K visuals that stay consistent across every post, ad and landing page.

Prompt

Based on the character reference image I upload, keep the character's face, hairstyle, body proportions, and main costume design and colors unchanged. Do not change the character and do not change the style. Turn the whole image into a "costume design sheet". Around the character, use only pencil line drawings to show the front, side, and back views of this outfit, as well as decomposed structure sketches of accessories, like a tailor's pattern sheet, with construction lines, simple size numbers, and a few small handwritten English notes. The overall layout should be clean and symmetrical, like an RPG game character design sheet, with a consistently warm color tone, ultra-high resolution, 4K, no logo, no watermark.

Parameters

size

prompt_priority

standard

image_urls

https://pub-ebac96ac8a0c4c789f53c7470fd2339c.r2.dev/20251204024444_14614_1.png

Estimated Cost (per image)

2.5 Credits

Total = Base Price × Count (n)

Sample Result

Prompt

724 (suggested: 2,000)

Input Images

Upload reference images

Click to upload or drag and drop

Supported formats: JPG, JPEG, PNG, WEBP
Maximum file size: 10MB; Maximum files: 10

Priority

Size

For specific aspect ratios, describe them in your prompt

Count

For multiple images, describe variations in your prompt

History

Max 20 items

0 running · 0 completed

Your generation history will appear here

Pricing

Starting from

$0.035

2.5 Credits

per image

Guaranteed

99.9% Uptime

Seedream 4.5 API for 4K social visuals

Plug Seedream 4.5 API into your product or workflow via evolink.ai and generate studio‑grade images, precise edits and reliable characters for every campaign, without hiring a full creative team.

What Seedream 4.5 API gives you

From simple prompts to 4K lifestyle shots

Seedream 4.5 API turns short prompts and a few reference photos into cinematic, realistic scenes that look ready for ads and landing pages. You get natural faces, clean lighting and sharp details, so even quick tests can go straight into your social feeds or store.

Generate your first scene

Edit multiple photos with perfect consistency

Upload several product or character photos and apply the same change to all of them in one Seedream 4.5 API request. Poses, outfits and key details stay the same, so whole sets of banners, thumbnails and gallery images look like they came from one well‑planned shoot.

Try multi‑image editing

Sharp text, logos and layouts

Seedream 4.5 API handles in‑image copy, buttons and logos well, so posters, app screenshots and thumbnails stay readable even on small screens. You can quickly test new hooks, offers and layouts without redrawing everything for each version.

Design ad‑ready creatives

Why choose Seedream 4.5 API on evolink.ai

Combine Seedream 4.5 API’s visual quality with evolink.ai’s unified gateway so your team ships better creatives without extra complexity.

Made for campaign‑grade visuals

Seedream 4.5 API is tuned for realistic scenes, stable characters and clean text, so your ads, emails and hero sections look like agency work instead of quick drafts. You spend less time fixing odd hands, faces or layouts and more time testing offers.

One integration, many use cases

Connect evolink.ai once and select Seedream 4.5 API for high‑end images in any tool, from your SaaS product to internal dashboards. Marketing, design and growth teams all tap the same endpoint while developers keep the integration surface simple.

Control cost while scaling

With evolink.ai you can mix Seedream 4.5 API with cheaper models in one routing layer, saving this premium model for your most important campaigns. Usage‑based billing makes it easy to track what each project spends and adjust your mix over time.

How to integrate Seedream 4.5 API

Connect evolink.ai once, then call the /v1/images/generations endpoint in three simple steps.

Get your evolink.ai API key

Sign up or log in to evolink.ai, enable Seedream models in your project and copy your API key. Store it as an environment variable so your backend, scripts or no‑code tools can authenticate securely when calling the Seedream 4.5 API.

Call /v1/images/generations

From your app or automation, send a POST request to /v1/images/generations with the model name, prompt, size and optional parameters like n, image_urls or prompt_priority. Include the Authorization header with your evolink.ai API key, then submit the request to start an image generation task.

Check task status and use the image

Read the task ID from the initial response and query the task status endpoint until the status is finished, or use a callback_url if your system supports webhooks. Once the task succeeds, take the returned image URLs, save them to your storage or CDN, and display them inside your product or publishing workflow.

Open Seedream 4.5 API docs

Seedream 4.5 API benefits

Turn advanced image generation into an everyday tool for your team.

Visual quality

Cinematic realism for every channel

Seedream 4.5 API focuses on lifelike lighting, textures and depth, so carousels, landing pages and banners look like real shoots instead of quick mockups. Your brand feels more trustworthy when users see consistent, polished visuals everywhere.

Batch workflow

Multi‑image editing in one go

Edit or restyle a whole batch of lifestyle, product or team photos with one prompt and keep key details aligned. This is perfect for seasonal refreshes and campaigns where you need many variants fast without breaking consistency.

Resolution & formats

4K and social‑native formats

Generate 4K hero shots and feed‑ready assets from the same API call, with square, vertical and cinematic ratios covered. You reduce manual cropping and export steps, and get files that drop straight into your tools.

Consistency

Consistent characters and products

Keep the same founder, mascot or hero product stable across dozens of images while changing backgrounds and angles. Seedream 4.5 API helps every frame feel like part of one story, which is key for long‑term branding and serial content.

Developer friendly

Simple API for builders

Through evolink.ai you call Seedream 4.5 API with the same pattern as other models, so your dev team does not juggle different vendors. It plugs cleanly into websites, SaaS products, internal panels and no‑code flows.

Cost control

Usage‑based pricing with routing

Evolink.ai lets you reserve Seedream 4.5 API for top‑impact visuals and send lighter tasks to cheaper models, all behind one gateway. You get predictable spend and can tune the mix as your volume grows.

Seedream 4.5 vs other image APIs

See how Seedream 4.5 API compares with Nano Banana Pro and Flux 2 for everyday creative work.

Model	Duration	Resolution	Price	Strength
Seedream 4.5 via evolink.ai	N/A	Up to 4K still images with strong text and multi‑image consistency	~$0.035 / image	Great balance of cinematic realism, small‑text clarity and batch editing for social, ads and e‑commerce, all behind a simple unified API gateway.
Nano Banana Pro (Gemini 3 Pro Image)	N/A	High‑resolution images up to 4K with strong photo realism and UI layouts	$0.05 / image	Excellent for photoreal shots, UI mockups and data‑driven charts when you need deep reasoning and tight integration with the wider Gemini ecosystem.
Flux 2 by Black Forest Labs	N/A	Up to 4 megapixels with fast generation for complex scenes and typography	$0.03 / image	Very strong at multi‑reference generation and advanced typography, suitable for teams that want open or semi‑open weights and fine‑grained control.

Seedream 4.5 API FAQ

Everything you need to know about the product and billing.

Seedream 4.5 API is a high‑end AI image generation and editing interface that turns prompts and reference images into realistic, high‑resolution visuals for any digital channel. It is ideal for solo founders, social media managers, performance marketers and SaaS teams who need a steady stream of brand‑safe images without building an in‑house studio. Through evolink.ai you can use Seedream 4.5 API inside your product, no‑code automations or internal tools, and keep output quality consistent across campaigns and clients.

Both Seedream 4.5 API and Seedream 4.0 focus on story‑driven, realistic images, but 4.5 is tuned for even stronger multi‑image editing, identity consistency and text rendering inside images. With Seedream 4.5 API you can more reliably preserve a character or product across a whole batch of shots, while also placing dense text like headlines or pricing in the scene without it turning blurry. On evolink.ai you can keep using Seedream 4.0 for fast, cost‑effective sequences and upgrade to Seedream 4.5 API whenever you need your most polished visuals.

Yes, Seedream 4.5 API is particularly strong for product‑centric campaigns, such as e‑commerce galleries, launch announcements, retargeting creatives and app store screenshots. You can upload existing packshots or lifestyle photos, then ask the model to change backgrounds, moods or props while keeping reflections, materials and key details accurate. This means you can quickly spin up new seasonal, regional or bundle‑focused ads from the same base assets, instead of scheduling new photo shoots every time you run a fresh offer or A/B test.

Evolink.ai uses pay‑as‑you‑go pricing for image APIs, so you pay per generated image rather than committing to a fixed subscription. Seedream 4.5 API is positioned as a premium visual model, and its final price per image or per 1K images is shown directly in your evolink.ai dashboard alongside other models, making it easy to compare and plan budgets. You can combine Seedream 4.5 API with more affordable models in the same integration, reserving it for flagship campaigns where the uplift in click‑through and conversion rate justifies the higher quality.

Seedream 4.5 API is well suited for automating social media visuals, especially when you want each post to feel bespoke while still protecting your brand identity. You can plug the API into schedulers, content calendars or custom growth tools so each new caption, offer or content idea automatically receives a matching image. Because Seedream 4.5 API handles realistic faces, text overlays and complex scenes well, it helps you maintain a cohesive grid, story set or short‑form video thumbnail strategy even as you scale to daily or hourly posting.

To integrate Seedream 4.5 API you first sign up on evolink.ai, generate a unified API key and enable Seedream models in your project. Your developers then call a single HTTP endpoint with a model name, prompt, reference images and optional parameters like aspect ratio or style, so you can switch models later without rewriting your integration. From there you can surface Seedream 4.5 API in user‑facing features such as automatic thumbnails, profile picture generators or design wizards, or keep it behind the scenes to empower your marketing and creative operations teams.

API Reference

Select endpoint

Authentication

All APIs require Bearer Token authentication.

Header

Authorization: 
Bearer YOUR_API_KEY

Get API Key

POST

/v1/images/generations

Generate Image

Create an image generation task using text prompts or reference images. Supports text-to-image, image-to-image, and image editing modes.

Asynchronous processing mode, use the returned task ID to .

Generated image links are valid for 24 hours, please save them promptly.

Request Parameters

modelstringRequiredDefault: doubao-seedream-4.5

Image generation model name.

Value	Description
doubao-seedream-4.5	Seedream 4.5 model

Exampledoubao-seedream-4.5

promptstringRequired

Prompt describing the image to be generated or how to edit the input image.

Notes

Limited to 2000 tokens

ExampleA serene lake reflecting the beautiful sunset

nintegerOptionalDefault: 1

Maximum number of images to generate.

Value	Description
1-15	Any integer between 1 and 15

Notes

To generate multiple images, include prompts like: "generate 2 different images" in your prompt
Reference image count + final generated image count ≤ 15 images
Each request will pre-charge based on the value of n, actual charges based on the number of images generated

Example1

sizestringOptionalDefault: 2048x2048

Size of generated image, supports two formats.

Value	Description
2K	Simplified format - model auto-determines optimal size
4K	Simplified format - model auto-determines optimal size
2560x1440	Pixel format example
2048x2048	Pixel format (default)
4096x4096	Pixel format example

Notes

Simplified format: describe aspect ratio/shape/purpose in prompt, model will automatically determine optimal size
Pixel format: Width x Height within range [2560x1440, 4096x4096]
Aspect ratio range: [1/16, 16]

Example2048x2048

prompt_prioritystringOptionalDefault: standard

Prompt optimization strategy, used to set the mode for prompt optimization.

Value	Description
standard	Standard mode, higher quality output, longer processing time

Examplestandard

image_urlsarrayOptional

Reference image URL list for image-to-image and image editing features.

Notes

Max 14 images per request
Max size: 10MB per image
Formats: .jpeg, .jpg, .png, .webp, .bmp, .tiff, .gif
Aspect ratio (width/height) range: [1/16, 16]
Width and height (px) > 14
Total pixels: no more than 6000×6000
URLs must be directly accessible by the server

Examplehttps://example.com/image1.png

callback_urlstringOptional

HTTPS callback address after task completion.

Notes

Triggered on completion, failure, or cancellation
Sent after billing confirmation
HTTPS only, no internal IPs
Max length: 2048 chars
Timeout: 10s, Max 3 retries

Examplehttps://your-domain.com/webhooks/image-task-completed

Request Example

{
  "model": "doubao-seedream-4.5",
  "prompt": "A serene lake reflecting the beautiful sunset",
  "size": "2048x2048",
  "n": 1,
  "prompt_priority": "standard"
}

Response Example

{
  "created": 1757165031,
  "id": "task-unified-1757165031-seedream4d",
  "model": "doubao-seedream-4.5",
  "object": "image.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 45
  },
  "type": "image",
  "usage": {
    "billing_rule": "per_call",
    "credits_reserved": 1.8,
    "user_group": "default"
  }
}