ByteDance Seedream 5.5 Holds Edits Across 100 Rounds
ByteDance’s Seed team launched Seedream 5.5 on 9 November, saying the image model can keep working on one picture through 100 edit rounds while holding unedited areas at the pixel level. Company tests found film and office usability more than doubled versus the prior version.
100 successive edits on one image, with unedited regions held at the pixel level. That is the headline claim ByteDance’s Seed team published on 9 November as it launched Seedream 5.5, its new image model.
The details are in a Seed blog post and on the Seedream 5.5 product page. The team says errors usually pile up when one output becomes the next input. Seedream 5.5 is trained to leave untouched areas unchanged at the pixel level, so later edits do not make the rest of the frame drift.
Transparent assets and sharper text
The model can write native RGBA images, including fully and partly transparent backgrounds, so objects can drop into a layout without a separate cut-out step. Seed also says lighting, materials and skin look more natural, with less heavy gloss, and that complex characters and dense small type render more accurately.
Company tests, not an independent bench
ByteDance tested the model on MagicArena across e-commerce, marketing, film and television, gaming, office work and fashion design. Experienced reviewers scored quality and usability. Against Seedream 5.0 Pro, both measures improved in every setting. In film and television and in office productivity, usability rates were more than twice those of the previous version.
In paired preference tests (GSB), it beat the prior version on text structure and realism, reaching a +55.62% score for realism on image-to-image tasks. Seed also says it leads GPT Image 2.5 Sunburst and Nano Banana 2.1 on text structure, with a clear edge in text-to-image realism. Severe text corruption fell to 0.4% and minor corruption to 1.7% in Chinese and English tests, including dense small type. Those figures come from ByteDance.
Where it is rolling out, and what it costs
The Chinese-language version of the same Seed post says Seedream 5.5 is appearing on Dreamina (即梦), Doubao, Doubao Work and Volcano Engine Ark. Yicai reported that Doubao, Doubao Work and Dreamina already have the model, while the API is about to go live on Ark. A 2K square edit costs about 0.28 yuan, less than half the price of Seedream 5.0 Pro, with billing based on the input and output images and no fee for text tokens. A Pro version of the 5.5 series will follow, Seed says.
Image models are already a mass consumer tool. OpenAI recently said ChatGPT’s image tools were running at about 4 billion images a week.
Why it matters
Most image models still drift after repeated edits. If the 100-round hold and native transparent output work as advertised, designers can iterate in the same file rather than start over. The usability doubling and the 0.28-yuan price are vendor-linked figures, so buyers should test a real job themselves.
