ByteDance introduced Seedream 5.5 on 9 November, outlining an image model that generates transparent assets and aims to preserve untouched areas through repeated edits. Its announcement includes a demonstration involving 100 successive changes to one image.
Transparent assets
The model’s native RGBA output adds an alpha channel, which records transparency alongside colour. That allows a generated object to retain transparent or partly transparent areas when placed over another background.
The official model page shows separate character assets, decorative lettering and an extracted object with transparent surroundings. These illustrate a different output from a finished rectangular picture: elements that can be arranged within a larger design.
Repeated edits
In ByteDance’s demonstration, each result becomes the input for the next edit. Clothing, accessories and nearby objects change while the same person remains in the scene. The company says targeted training helps preserve areas outside the requested change.
ByteDance also reports improvements in realism and text rendering, based on evaluations conducted through MagicArena. Those are company-reported results. Sulat has not independently tested the model, and the selected demonstration does not establish a general guarantee of unchanged quality across 100 edits.
Preview access
The official page directs users to Dreamina and links its API button to a BytePlus playground URL carrying the identifier dola-seedream-5-5-preview-260628. The identifier explicitly includes “preview”.
During Sulat’s public-page check on 9 November, that destination exposed a login screen. We did not verify a successful generation request, account eligibility or the regions in which access is available. The link alone cannot establish general API availability.
BytePlus’s public pricing page, marked updated on 9 November, lists several earlier Seedream models but no 5.5 entry. Official per-image pricing for this version therefore remains unconfirmed in the documentation checked.
ByteDance says a Pro version of the Seedream 5.5 series will follow, without giving a date.
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