Seedream 5.5 Advanced (ByteDance)

Overview

Seedream 5.5 Advanced is an image generation and editing model from ByteDance’s Seed team. It creates a new image from a written prompt, or edits visuals using the same prompt plus optional reference images. The model is designed to keep untouched regions stable across many edit rounds, so iterative art direction doesn’t slowly drift. It can also output native RGBA images with an alpha channel, which helps you ship clean cutouts without extra background removal.

ByteDance reports stronger realism and better text rendering in this release. In its internal text rendering evaluation, severe text corruption is reported at 0.4%, with minor corruption at 1.7%.

What you can build

• Product photo revisions that keep the packshot identical while changing labels, colors, or lighting
• Marketing creatives with readable small text, like price tags and headline blocks
• Sticker packs and icon assets with a transparent background for direct reuse
• Scene edits across multiple rounds, like furniture swaps while keeping perspective consistent
• Brand mockups that insert logos into materials like glass, fabric, or embossing
• Character concept exploration where you iterate outfits and props without redoing the whole scene

Inputs

• A required instruction prompt as plain text. Use it to describe what to generate, or what to change in the provided image.
• Optional reference images you upload to edit or combine. You can provide up to 10 images.
• A target output width and height in pixels. Keep the aspect ratio between 1:16 and 16:1.
• Output size constraints apply to the full image area. Total pixels must stay between 921,600 and 4,624,220.
• A background mode choice. You can let the model decide, force an opaque background, or request transparency.
• An output file format choice. You can export as JPEG or PNG.
• An optional watermark toggle. When enabled, the output includes a visible “AI generated” mark.

Outputs

The model returns one rendered image in the file format you selected. The output matches your requested pixel dimensions, as long as they fit the pixel and aspect ratio limits.

When you request a transparent background, the output is a PNG with an alpha channel. That PNG can include partial transparency, like glass edges, smoke, or soft shadows.

Recommended settings

• For stickers, logos, and cutout product assets: choose PNG output and request a transparent background.
• For standard photo-like renders with no transparency needs: choose JPEG output and use an opaque or auto background.
• For layout-ready assets: pick dimensions close to the maximum allowed pixel area, then keep edits small per round.

Limitations

• The output image area must stay within 921,600 to 4,624,220 total pixels, and the aspect ratio must be between 1:16 and 16:1.
• You can provide up to 10 reference images. If you upload more, only 10 are used.
• Low-quality inputs can cause failures or visual artifacts. This includes heavy compression, motion blur, tiny subjects, and noisy screenshots.
• Messy compositions and dense small text still raise the risk of misspellings or warped letterforms.
• Multi-round editing is more stable than many image editors, but large structural changes can still introduce drift.

Safety & compliance

Most hosted deployments run a safety checker by default. Some providers only allow disabling safety checks with explicit account authorization.

Don’t submit content that violates local law or platform rules. Only upload reference images you own or have rights to edit. If you ask for a watermark, keep it visible in downstream use where required by your policy.