Seedream 5.5: what we know

ByteDance Seed introduced Seedream 5.5 on November 9, 2026, as its next-generation image creation model for professional visual production [reported]. A BytePlus Lumina preview describing the same five capabilities is dated October 15, 2026 [reported]. The rollout is staged: Jimeng (Dreamina), Doubao, Doubao Work, and Volcano Engine Ark first, with CapCut and BytePlus following [reported]. A Pro version is planned, with no date announced [reported].

The core claim is pixel-level stable multi-turn editing: up to 100 rounds of continuous local edits on a single image, with unedited regions preserved at the pixel level and no color shift [reported]. ByteDance's demo shows one portrait edited 100 times in sequence — clothing, glasses, rings, tabletop items — which is the entire public evidence for the number so far. Test it on your own images before trusting it on client work.

The second headline feature is native RGBA output: the model generates images with an alpha channel, so transparent-background assets come out directly instead of needing a background-removal step [reported]. It can also split one image into a base plus transparent layers [reported]. The third is text: a severe text-corruption rate of 0.4% and a minor rate of 1.7% across languages and formats [reported], with text generation in 14 languages on Dreamina [official]. ByteDance also claims a +55.62% GSB preference score over Seedream 5.0 Pro in image-to-image realism [reported] — its own benchmark, not independently reproduced.

The official free route is Dreamina: its own pages list Seedream 5.5 among the available models and say you can start with free daily credits [official]. Open Dreamina, pick Seedream 5.5 in the model picker, and check your credit balance before generating — access and per-generation cost depend on your settings and plan.

The cheapest third-party free route we verified is Creati.ai: a free plan with 100 starter credits and a daily free-credit claim, no card required [official]. Other independent wrappers offer small signup trial amounts — seedream55.io gives free trial credits on Google sign-in [reported], and several clone-style sites advertise 60–75 free starter credits [reported]. Treat every wrapper as a separate vendor: confirm the model name in the picker before you generate, because several sites still run Seedream 5.0 Pro behind a "5.5" headline, and one established platform's page still states there is no Seedream 5.5 at all — a stale page from before the November 9 launch.

The practical free test: generate one product shot with a transparent background and one poster with a headline in your language, then edit each three times in a row. If the text holds and the untouched areas stay put, the model earns its place in your workflow — that is the claim that matters, and it costs nothing to check.

There is no confirmed official BytePlus ModelArk API entry for Seedream 5.5 as of November 10, 2026 [unknown]. A tracker that rechecked the ModelArk catalog and pricing pages on October 22 found only the 5.0 family listed [reported] — and that was before the November 9 launch, so recheck before building on it.

Third-party aggregators moved first. APIXO reports Seedream 5.5 live since November 6, 2026, callable with model ID seedream-5-5, with text-to-image, editing from up to 10 reference images, transparent PNG output, and layer decomposition [reported]. apimodels.app lists a Doubao Seedream 5.5 endpoint at $0.03 per image at 1K/1.5K and $0.05 at 2K, plus $0.01 per reference image, with layer splitting billed per layer returned [reported]. Atlas Cloud lists Seedream 5.5 at a flat $0.02 per image for generation, editing, and layer decomposition [reported]. These are aggregator prices for aggregator endpoints — convenient for prototyping, not a vendor list price.

ByteDance has not published a USD list price for Seedream 5.5 [unknown]. The one vendor-side figure in circulation is around 0.28 RMB per 2K edit, reported as under half of Seedream 5.0 Pro in some tiers [reported]. ByteDance is also reported to be running promotions, including unlimited-generation periods on CapCut and Dreamina [reported] — a launch window, not a price.

Third-party workspaces set their own prices, and they spread widely. seedream55ai.com — an independent workspace, explicitly not affiliated with ByteDance — sells credit packs from $2.99 and plans from $7.99 per month [reported]. seedream55.io lists $9.90 per month (50% off $19.80), at 10 credits per 2K image and 16 per 4K image, about $0.275 per image [reported]. Creati.ai lists a free plan, then Starter at $14.99 per month for 350 workspace credits, Pro at $39.99 for 1,600, and Premium at $119 for 5,500 [official]. One-time credit packs elsewhere start at $9.90 for 99 credits [reported]. None of these is ByteDance's price — compare per-image cost, and confirm the model in the picker before paying.

Against Seedream 5.0 Pro, the upgrade is editing stability, native transparency, and text — plus a lower reported per-edit cost (around 0.28 RMB per 2K edit vs 5.0 Pro's higher tiers) [reported]. If your work is single-shot generation, 5.0 Pro remains capable; if your work is iterate-a-poster-ten-times or ship transparent product assets, 5.5 is the version built for it.

Against GPT Image 2.6, there is no comparison to report [unknown]. ByteDance's own comparisons name GPT Image 2.5 Sunburst and Nano Banana 2.1 [reported] — GPT Image 2.6 reached the Arena evaluation platform on November 4, 2026, five days before the Seedream 5.5 announcement, and ByteDance's published comparisons skip it [reported]. Until an independent head-to-head runs, "5.5 beats GPT Image 2.6" is a claim without evidence in either direction.

Three things, in order of importance. First, the official BytePlus ModelArk API entry and price — the aggregator rates above are a stopgap, and the vendor price will reset every wrapper's math. Second, independent verification of the 100-round editing claim and the text-corruption rates on real briefs, not ByteDance's demo. Third, the Seedream 5.5 Pro announcement: date, specs, and price — and until then, treat any "5.5 Pro" checkout page as a mislabel.

The pragmatic move is to test the free Dreamina route on your own hardest brief this week, and keep your integration behind your own abstraction — providers, prices, and limits in this space change monthly.