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Seedream 4.0

Seedream 4.0 is a multimodal image generation model from ByteDance. It natively accepts text, single-image, and multi-image inputs, returns either a single image or a consistent set, and renders up to 4K resolution at $0.03 per image.

Image Gen
index.ts
import { experimental_generateImage as generateImage } from 'ai';


const result = await generateImage({
  model: 'bytedance/seedream-4.0',
  prompt: 'A red balloon on a wooden table.'
});
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About Seedream 4.0

Seedream 4.0 was released August 28, 2025 as a multimodal image creation model from ByteDance. It extends beyond text-to-image generation by accepting text, single-image, and multi-image inputs natively in a single endpoint, then returning either one image or a set of related images with consistent subjects.

Multi-image input opens workflows that earlier text-to-image models couldn't cover in one call. You can blend several reference images, edit a source photograph with prompt-driven changes, or generate a series of frames that hold a subject's identity across scenes. ByteDance positions this as the foundation for catalog generation, batch editing, and reference-consistent series production.

Output resolution reaches up to 4K, which suits print layouts, hero imagery, and high-resolution editorial use without a separate upscaling step. ByteDance reports a per-image generation time near 1.8 seconds in published examples, a meaningful step up from earlier Seedream releases.

Seedream 4.0 is a dedicated image model. Call it through the AI SDK's generateImage function with the model set to bytedance/seedream-4.0. AI Gateway handles authentication and provider routing.