Seedream 5.5: Release, RGBA Checks and API Readiness

The November 9 Seed announcement highlights repeated editing, native RGBA output and more natural image rendering with improved text. Its demonstration describes 100 successive edits. These are vendor claims and demonstrations, not an independently verified guarantee that every image will survive that many revisions.

• ByteDance Seed: dated announcement

The model page shows editing and transparent-asset examples. Treat those as a description of intended use. For a production decision, inspect your own downloaded file, not just a checkerboard preview or a promotional example.

• Seedream 5.5: model and example page

BytePlus’s current product page is titled Seedream 5.5 Official API and lists first-purchase packages with 30-day validity. Some price fields remained “Loading pricing” in the retrieved page. That is evidence of an official offering, but it does not establish the exact model identifier, usable parameters, account entitlement or final checkout price.

• BytePlus: Seedream product and offers

We did not obtain a readable 5.5 request contract from the checked API Explorer page. Rather than claiming that no API exists, leave the integration pending until your chosen service supplies the identifier, authentication method, supported output format and limits. Do not substitute a third-party route without labeling whose service it calls.

• Confirm the exact model version selected in the account or API documentation.
• Check whether alpha output requires a parameter, a separate task or a particular file format.
• Record reference-image limits, resolution choices and whether an edit consumes the previous output.
• Verify unit pricing and any promotional expiration separately from the model announcement.

Start with an image you own: a ceramic cup with a distinctive handle and the word ORBIT printed on its face. Save that original as revision zero. Request only a background change, then add a coaster, then change the coaster’s color. Three revisions are enough to expose obvious drift without paying for a long chain before the basics work.

Compare each output to both its immediate parent and revision zero. The parent comparison catches a change introduced in the latest step; the original comparison catches accumulated drift. Inspect lettering at full size and check the handle’s opening, rim thickness and contact shadow. A pleasing overall picture can hide a changed product.

For a pixel-preservation claim, first align dimensions and account for any resampling or compression. Measure differences only in a defined region that the request was supposed to leave untouched. Record those preprocessing steps so a difference map does not confuse an export change with a generation defect.

Request a separate cutout of an original decorative paper lantern. After downloading it, verify that the file contains an alpha channel and that its values are not uniformly opaque. A PNG extension alone proves neither. Composite it over white, black and a saturated blue background to reveal halos and missing interior gaps.

• Inspect thin supports, holes and translucent paper rather than only the outer silhouette.
• Look for a checkerboard pattern painted into RGB pixels; that is not usable transparency.
• Keep partial alpha where a material should transmit light. Turning every edge into a binary cutout may destroy the intended appearance.
• Test the asset in the actual destination editor and export format before accepting it.

Store the approved transparent asset separately from the flattened campaign image. If a later edit changes only the campaign background, reuse the approved layer instead of regenerating the subject. This reduces the number of opportunities for the product or lettering to drift.

For a current SJolt baseline, use Seedream V5 Pro’s image-edit route. The reviewed local contract accepts up to ten reference images, 1K or 2K output and documented aspect-ratio options. It does not expose a 5.5 model ID or an RGBA switch. The example below tests a simple edit; it makes no transparency guarantee.

• SJolt: Seedream V5 Pro image editing
• SJolt: public task API

Send this body to POST https://sjolt.ai/sjolt-ai/v1/bytedance/seedream-v5-pro/image-edit with your SJolt bearer credential. Replace the example URL with an authorized, accessible source image.

{
  "input": {
    "prompt": "Change only the background to warm ivory. Keep the ceramic cup shape, handle, rim and printed word ORBIT unchanged.",
    "image_urls": [
      "https://example.com/approved-cup.png"
    ],
    "aspect_ratio": "1:1",
    "resolution": "2K"
  }
}

The task response gives an identifier to query through the documented task endpoint. Review the completed output before making it the source of the next edit. The request shape is checked locally; no generation was purchased. Keep any future 5.5 trial as a separately labeled run so changes in model, service and export settings remain visible.