ByteDance Seed Launches Seedream 5.5: Stable Editing Across 100 Rounds With Pixel-Level Preservation, Native RGBA Transparent Assets, and a 0.4% Severe Text Corruption Rate (Vendor Figures)

Background and Pain Points

Once image models enter e-commerce, advertising and film workflows, the main problem is often not single-image quality but drift during revisions: change a jacket and the background color shifts, and after a few rounds details blur and text breaks. Designers also still cut out backgrounds by hand before compositing. Seedream 5.5 targets these reliability issues.

Architecture Highlights

ByteDance has not disclosed parameter counts or architecture details. It describes three capabilities: multi-turn editing that preserves unedited regions at the pixel level and removes color shifts, supporting 100 successive edits on one image; native generation of images with an alpha channel, including full and partial transparency, with refined edges; and more natural lighting, materials and skin textures with less gloss and overexposure, plus better rendering of complex characters and dense small text.

Benchmarks

Evaluations were run by ByteDance with expert raters on its MagicArena platform, so they are vendor figures. Versus Seedream 5.0 Pro, usability rates and mean opinion scores rose in all six use cases (e-commerce, marketing, film/TV, gaming, office, fashion), and usability more than doubled in film/TV and office work. Image-to-image realism GSB is +55.62%. Severe text corruption is 0.4% and minor corruption 1.7%. ByteDance says it leads GPT Image 2.5 Sunburst and Nano Banana 2.1 in text structure and text-to-image realism, but gives no exact scores for those comparisons, and no third-party leaderboard results are public yet.

Getting Started

In China, users can pick Seedream 5.5 in Jimeng (Generate/Canvas), Doubao image generation and Doubao Work skills; developers can find Doubao-Seedream-5.5 in the Volcano Engine Ark experience center under vision models. Internationally it is coming to Dreamina, CapCut and BytePlus. The official blog does not list API pricing, so check the Ark or BytePlus console before integrating. E-commerce and poster workflows that need transparent PNG assets or repeated local edits are the best first tests. A Pro version is planned.