Model comparison

Seedream 5.5 vs GPT Image 2.6 Sunburst: Product Images and Edits

Compare Seedream 5.5 and GPT Image 2.6 Sunburst for transparent product assets, localized edits, detailed layouts, and export formats.

Reviewed November 9, 2026 · Published documentation and evaluations

Quick verdict

Seedream 5.5 is a strong candidate for transparent raster assets and targeted edits that leave the rest of the frame stable. GPT Image 2.6 Sunburst is a strong candidate when you need markup-guided instructions, adjustable planning effort, or SVG and GIF exports through its API.

Side-by-side comparison

Vendor results are identified where quoted. The last column explains how each difference affects an image workflow.

Feature	Seedream 5.5	GPT Image 2.6 Sunburst	What it means
Transparent output	Native RGBA includes partial transparency.	The Image API documents a transparent background option for supported GPT Image models.	Check whether your exact endpoint and format return usable alpha.
Local revisions	ByteDance demonstrates preserving unedited pixels through repeated edits.	OpenAI reports better edit consistency and supports markup-guided edits.	Compare unedited labels, product outlines and camera framing.
Detailed layouts	ByteDance highlights dense small type and realistic text-to-image rendering.	OpenAI positions Sunburst for detailed compositions and precise editing.	Use a real packaging or poster brief to compare fidelity.
Workflow controls	The documented model focuses on targeted edits and raster assets.	The API documents adjustable complexity and SVG or animated GIF output.	Choose based on the editable controls and final file your project needs.
Published head-to-head	ByteDance compared 5.5 with GPT Image 2.5 Sunburst.	The current comparison page covers 2.6 Sunburst.	A direct 5.5-versus-2.6 result is not established by that benchmark.

Compare transparent files over the intended background

For an e-commerce listing, the hard part is often the soft shadow or translucent edge. Seedream 5.5 documents native partial alpha. If your GPT Image endpoint supports transparent output, place each exported asset over the same light and dark backgrounds and inspect whether the glass, hair or shadow retains the intended opacity. A PNG filename alone does not tell you whether usable alpha is present.

Measure what stays still as the brief changes

For a product campaign, keep the packaging artwork and camera angle fixed while changing one background element at a time. Seedream 5.5 emphasizes stability outside the requested region. GPT Image 2.6 adds controls for marking the area to change and choosing how much planning a complex request gets. Use the controls your production workflow would actually enable.

Read the version on the benchmark before using it

ByteDance’s typography and realism comparison names GPT Image 2.5 Sunburst. OpenAI released the 2.6 family on November 4, 2026. The older result helps explain where 5.5 may be worth testing. A claim that it beats 2.6 would require a direct comparison using that exact version.

Frequently asked questions

How do I check if a product image is actually transparent?

Export it in a format that supports transparency, such as PNG, then inspect the alpha channel. Try the file on light and dark backgrounds to check for halos and clipped shadows.

Did ByteDance show Seedream 5.5 beating GPT Image 2.6 Sunburst?

The November 9 benchmark uses GPT Image 2.5 Sunburst. Its published results apply to the named version and evaluation tasks.

Sources

See where Seedream 5.5 is available