Seedream 4.5 API

Seedream 4.5 API is ByteDance's advanced text-to-image model available through APIMart. It features 4K resolution output, industry-leading text rendering accuracy, reference image support, batch generation, and unified generation plus editing in one model. These capabilities make it ideal for marketing, e-commerce, and content creation. Batch generation requires reference images. Reference and generated images must total no more than 15.

Getting started is simple: 1) Sign up for a free APIMart account, 2) Add funds to your balance, 3) Generate your API key from the dashboard, 4) Make a POST request to /v1/images/generations with your prompt. Check our documentation for code examples in Python, JavaScript, and cURL.

Seedream 4.5 API is billed per image. Batch generation is settled according to the number of images actually produced. See the pricing details on this page for current prices and discounts.

For best results: Use natural language with structure (Subject + Style + Details). Be specific rather than vague. For text in images, use double quotes like "Your Text". Include style references (watercolor, cyberpunk, photorealistic). Avoid overloading prompts - concise descriptions often work better than complex ones.

Upload reference images via URLs in your API request. Seedream 4.5 extracts style elements, character features, and visual themes to maintain consistency. Use cases include brand asset matching, character series, product line consistency, and style transfer applications. Batch generation requires reference images. Reference and generated images must total no more than 15.

Seedream 4.5 supports output resolutions up to 4K and offers multiple aspect ratios to fit different use cases — from square 1:1 for social media profiles to 16:9 for presentations and banners. You can specify the desired dimensions in your API request, making it easy to generate images optimized for any platform or print format.

Sign up for APIMart, open the API Keys page in your dashboard and create a key. The same key calls the ByteDance Seedream 4.5 API and every other model on the platform, with pay-as-you-go billing and no subscription.

No, there is no free quota for the Seedream 4.5 API. It is pay-as-you-go: you only pay for successful requests, and every price already comes with 20% off. Platinum and Diamond members save up to 28%.

Yes. The Seedream 4.5 API is billed per generated image. The pricing table on this page lists every specification and shows the Gold member price, 20% off. Platinum and Diamond members save even more, up to 28%. You only pay for successful requests.

All three are ByteDance Seedream models on APIMart and share one API key. The Seedream 4.5 API offers 4K text-to-image with precise text rendering, reference images and batch generation with references. Seedream 4.0 provides a similar 4K generate-and-edit workflow, Seedream 5.0 Lite adds up to 10 reference images and 1-15 images per request, and Seedream 5.0 Pro focuses on cinematic 1K–2K quality. Each version has its own model page with current prices.