ByteDance launches Seedream 5.5, an image model built for 100 rounds of edits

ByteDance Seed launched Seedream 5.5, its new image model, on Monday 9 November. The company says it can keep editing one image across 100 rounds while leaving untouched areas unchanged at the pixel level, and can output images with transparent backgrounds. It is live in Doubao and Dreamina in China, with developer access due this week.

For anyone building keyframes and storyboards, edit stability is the feature that matters: one note on a frame should change one thing, not regenerate the whole shot. The detail the launch coverage skipped sits in ByteDance's own chart. Its evaluators rated fewer than a quarter of the new model's film and TV outputs usable, up from under a tenth for Seedream 5.0 Pro, by our reading of the published chart. That is the "more than twice" ByteDance leads with, and it still means most film frames failed its own reviewers. The headline price, about 0.28 yuan per edit, is a China figure for one task.

What the 100-round demo really shows

ByteDance's blog says the model can "preserve unedited regions at the pixel level and eliminate color shifts in those areas, while reducing detail loss and image degradation across successive edits," which it says "supports continued work on the same image across 100 rounds of editing." Watch the demo video and it is not one character holding steady for 100 shots. It opens on a man in a pink fuzzy coat at a chessboard, the person in the frame has become someone else by edit 59, and by edit 99 the picture is a green leather chess piece.

What the demo shows is an image surviving a long chain of deliberate changes without visible wear. Whether one character stays the same across different shots, the test storyboard work depends on, has not been shown outside ByteDance. The second upgrade is easier to picture: the model can "directly generate images with an alpha channel, including full and partial transparency," so title cards, overlays and props can drop into an editor without a background-removal pass. An alpha channel is the layer that stores transparency.

Every score comes from ByteDance's own testing

ByteDance tested six use cases, from e-commerce to film and TV, on MagicArena, its own evaluation platform, with what it calls experienced image-generation evaluators. It reports severe text corruption at 0.4% and minor corruption at 1.7%, against 2.8% and 2.6% for Seedream 5.0 Pro in the same chart. Against GPT Image 2.5 Sunburst and Nano Banana 2.1, the blog claims a lead on text structure and "a substantial advantage in text-to-image realism."

The chart behind that sentence also shows Nano Banana 2.1 ahead of Seedream 5.5 on realism when editing an existing image, with a score of minus 6.18% in ByteDance's own head-to-head test. For a model sold on editing, that is the comparison worth running yourself. ByteDance also calls 5.5 much faster without giving a number, and the nearly 40% figure in some reports appears in neither the English nor the Chinese blog.

What it costs, and where you can use it

Chinese reports of the launch give one price example: editing a 2K square image through ByteDance's China API (the paid route developers use to call the model) costs about 0.28 yuan, roughly 4 US cents at about 7 yuan to the dollar (our conversion), which they put at under half the price of Seedream 5.0 Pro. Our check of the Volcengine price list supports that for this one case. Seedream 5.0 Pro charges 0.60 yuan for an output above about 2.6 megapixels, so 0.28 yuan is about 47% of it. Below that size 5.0 Pro charges 0.30 yuan, so smaller edits may save little.

Neither Volcengine nor BytePlus, ByteDance's international cloud, listed Seedream 5.5 on Monday afternoon, so there is no published price outside China. Dreamina's X account called the launch a global debut, and CapCut says the model is coming to its app. Third-party resellers already sell endpoints under the Seedream 5.5 name. The two cents an image line repeated in a wave of near-identical X posts matches one reseller's lowest tier, not anything ByteDance has published. An unaffiliated site issued a release claiming native 4K five days before the launch, and ByteDance makes no 4K claim. ByteDance says a Pro version of 5.5 will follow, with no date.

What it means for AI creators

• The test that matters is 20 to 30 edits on one character still, with the last round set next to the first, before a storyboard workflow is rebuilt around the model.
• Transparent output is the concrete time saver for title cards, overlays and character sheets, as long as the alpha channel survives the trip into your editor.
• Some sites using the Seedream 5.5 name have no tie to ByteDance, so a transparent-background request is a quick way to check what a paid tool is really running.

Our take

Edit-first is the right bet for filmmaking, because the pain is rarely the first draft and usually the twentieth note. ByteDance has the strongest claim in that lane this week, and it also published the chart that tempers it: by its own count, most film frames still do not pass. Treat Seedream 5.5 as a real step on stability, not a finished storyboard tool, until someone outside ByteDance runs one frame through 30 rounds and shows the result.

Timeline

• Date: Wed 4 Nov 2026. Event: Unaffiliated site Seedream-5.io issues a release claiming a native 4K Seedream 5.5; Source: IssueWire
• Date: Mon 9 Nov 2026. Event: ByteDance Seed publishes the Seedream 5.5 blog and model page; live in Doubao, Doubao Work and Dreamina in China; Source: ByteDance Seed; Sina Tech
• Date: Mon 9 Nov 2026. Event: Dreamina posts a global debut; CapCut says the model is coming; Source: Dreamina and CapCut on X
• Date: Mon 9 Nov 2026. Event: No Seedream 5.5 entry on the Volcengine or BytePlus price lists (checked afternoon, London); Source: Volcengine Ark; BytePlus docs
• Date: Week of 9 Nov 2026. Event: Developer access due on Volcengine Ark; Source: Sina Tech
• Date: No date given. Event: Seedream 5.5 Pro; Source: ByteDance Seed blog

Sources and what is unconfirmed: ByteDance Seed blog (English and Chinese) and model page, 9 Nov 2026, including its demo video and evaluation charts; Sina Tech, Yicai and IT Home launch reports, 9 Nov; Volcengine Ark and BytePlus ModelArk price pages, read 9 Nov; IssueWire, 4 Nov; X posts from Dreamina, CapCut and BytePlus, 9 Nov. The film and TV usability levels (just over 20% for Seedream 5.5, under 10% for 5.0 Pro) are our reading of ByteDance's radar chart, which prints no values. Unconfirmed: any international price, any speed figure from ByteDance, whether third-party Seedream 5.5 endpoints run ByteDance's model, and how the 100-round claim holds on a user's own images. We did not contact ByteDance.