Question 1

What is Seedream 4.5?

Accepted Answer

Seedream 4.5 is ByteDance's latest image generation model featuring a unified architecture that handles both text-to-image generation and image editing in a single model. It's designed for iterative creative workflows where generation and refinement happen in rapid cycles.

Question 2

How much does Seedream 4.5 cost on Runflow?

Accepted Answer

Seedream 4.5 is priced at $0.04 per image on Runflow. That's flat per-image pricing — no GPU-second billing, no cold start charges.

Question 3

What makes Seedream 4.5 different from Seedream 4?

Accepted Answer

Seedream 4.5 introduces a unified generation and editing architecture — the same model handles both text-to-image generation and image editing. Seedream 4 is the previous generation with solid quality at $0.03/image. Both are available on Runflow via the same API.

Question 4

What resolutions does Seedream 4.5 support?

Accepted Answer

Seedream 4.5 supports resolutions from 1920×1920 up to 4096×4096 pixels, with total pixel count between 2560×1440 and 4096×4096. You can pass custom width/height values via the image_size parameter.

Question 5

Can I use Seedream 4.5 commercially?

Accepted Answer

Yes. Seedream 4.5 is available under a commercial license. You can use it in production SaaS products, client work, and high-volume pipelines.

Question 6

How does Seedream 4.5 compare to FLUX and Midjourney?

Accepted Answer

Seedream 4.5's key differentiator is its unified generation and editing architecture — competing models typically require separate pipelines. At $0.04/image it's also competitively priced against FLUX Pro variants. Detailed per-niche benchmark scores are coming to Runflow.

Question 7

Do I need to manage GPUs or infrastructure?

Accepted Answer

No. Runflow handles all GPU provisioning, scaling, and failover. You make an API call, you get back an image. No infrastructure to manage.

Use Case	Assessment	Notes
Portrait	Strong	Solid photorealism at a competitive price point
Fashion	Moderate	Good detail, slightly less refined than 4.5
Product	Strong	Accurate product rendering with clean output
Creative	Moderate	Capable artistic generation with good composition

Parameter	Type	Required	Description
prompt	string	required	Text prompt describing the image to generate.
image_size	object \| string	optional	Output size. Width and height must be between 1920–4096, or total pixels between 2560×1440 and 4096×4096. Default: 2048×2048.
num_images	integer	optional	Number of generation runs. Range: 1–6. Default: 1.
max_images	integer	optional	Max images per generation run (enables multi-image mode). Range: 1–6. Default: 1.
enable_safety_checker	boolean	optional	Enable content moderation. Default: true.
seed	integer	optional	Random seed for reproducible outputs.
sync_mode	boolean	optional	Return media as data URI without storing in history. Default: false.

Seedream 4.5 API

Seedream model family by ByteDance

Seedream 4.5

Seedream 4

Benchmarked for your use case

API Parameters

Technical Specifications

Why run Seedream 4.5 on the Runflow API

Unified generation + editing in one model

Edit-aware generation

Up to 4K output resolution

Sentinel quality scoring

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Frequently asked questions