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Seedream 4.5

Seedream 4.5 is the latest in-house image generation model from ByteDance. Compared with Seedream 4.0, it delivers better editing consistency, stylization, and prompt adherence at $0.04 per image.

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


const result = await generateImage({
  model: 'bytedance/seedream-4.5',
  prompt: 'A red balloon on a wooden table.'
});
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About Seedream 4.5

Seedream 4.5 was released November 28, 2025 as ByteDance's latest in-house image generation model. It builds directly on Seedream 4.0 and focuses the architectural updates on editing fidelity rather than new input modalities.

The headline change is editing consistency. When you ask Seedream 4.5 to alter a portrait, swap a background, or refine a small text element, subject details, lighting, and color tone carry over more reliably than in Seedream 4.0. That matters for product photography touch-ups, brand-controlled marketing assets, and any workflow where the source image already passed approval and only specific elements should change.

Stylization and prompt adherence also improve. Seedream 4.5 interprets descriptive style instructions more precisely, which reduces the number of regeneration passes needed to land on the intended look. ByteDance also calls out gains in portrait refinement, small-text rendering, multi-image composition, and visual aesthetics relative to Seedream 4.0.

Seedream 4.5 is a dedicated image generation model. Call it through the AI SDK's generateImage function with the model set to bytedance/seedream-4.5. AI Gateway handles authentication and provider routing.