Seedream 5.5

ByteDance's newest image model: generate and edit up to 3K, with native transparent backgrounds and edits that stay stable round after round.

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Seedream 5.5

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Key features

Transparent backgrounds, straight from the prompt

Set Background to Transparent and get a PNG with a real alpha channel: stickers, icons, product cut-outs and decorative elements with no masking or edge cleanup. It works for new images and for edits.

Edits that stay where you point

Change an outfit, recolor a product or replace one object and the rest of the image stays put. ByteDance built 5.5 to stay stable across long chains of edits, so you can refine an image step by step.

Up to 3K, eight aspect ratios

Render at 1K, 2K or 3K in 21:9, 16:9, 3:2, 4:3, 1:1, 3:4, 2:3 or 9:16. At 3K a 16:9 frame is 3840×2160 and a square is 2880×2880.

More natural people and products

Expressions, body proportions, object sizes, materials and lighting look more believable than in Seedream 5.0, and several references combine with consistent scale, perspective and light.

Use cases

Stickers and icon sets

Generate a set of die-cut stickers or app icons on a transparent background, ready to drop onto any design.

Product cut-outs for e-commerce

Turn a product photo into a clean transparent PNG, or place the product into a new lifestyle scene with matching light.

Step-by-step outfit and color changes

Change the jacket, then the shoes, then the color of the bag on the same photo while the person and pose stay the same.

Group shots from several references

Combine up to 10 reference photos of people, props and a location into one scene with consistent scale and lighting.

Backlit and cinematic portraits

Rim light along hair and shoulders, skin detail in the shadows and film-style color for editorial portraits.

3K posters and wallpapers

Render 3840×2160 landscapes or 2160×3840 phone wallpapers at full size, without an upscaling pass.

Pick the right model

Seedream 5.5 is the value pick with transparent output and stable edits. Switch when a job needs something it doesn't do best.

Transparent PNGs, stable multi-round edits, up to 3KSeedream 5.5 ←

Dense on-image text and complex layoutsGPT Image 2.6

Prompt optimization that rewrites a short promptSeedream 5.0 Pro

Multilingual text, factual accuracyNano Banana 2.1

Photoreal portrait, exact colorFlux 2 Pro

Vector / SVG outputRecraft V4.1

How to use

Open Seedream 5.5 from this page or pick it in the Image Generator.

Describe the image, and upload up to 10 reference images if you want to edit or combine photos.

Pick aspect ratio, resolution (1K, 2K or 3K) and Background: Auto, Opaque or Transparent.

Generate, then describe the next change to keep refining the same image.

Deep dive

What Seedream 5.5 is good at, and where it isn't

Seedream 5.5 is ByteDance's attempt at an "AI Photoshop": one model that generates an image, keeps it consistent through many rounds of edits, and hands you assets you can use directly in a design. It succeeds Seedream 5.0 Pro, and on ZOOOP it is both more capable and cheaper than its predecessor.

The first flagship capability is native transparency. Set Background to Transparent and the model returns a PNG with a real alpha channel, for text-to-image and for edits alike. In our test a prompt for "a glossy cartoon sticker of an orange cat holding a coffee cup" came back as a clean die-cut sticker that dropped onto a colored background with no halo. Stickers, icon sets, product cut-outs and decorative elements no longer need a separate background-removal step. With 5.0 Pro, transparency only worked when you edited a PNG that already had an alpha channel.

The second is stable multi-round editing. Edits stay on the region or object you name and leave the rest of the frame alone, so you can chain changes: the jacket, then the shoes, then the color of the bag. ByteDance demonstrates it with a watch whose clock advances one second per edit for 100 rounds while the case, strap, lighting and background stay fixed. Up to 10 reference images can be combined, and the model keeps their scale, perspective and lighting consistent with each other.

The third is resolution and framing. Seedream 5.5 offers 1K, 2K and 3K in eight aspect ratios including 21:9. At 3K a widescreen frame is 3840×2160 and a phone wallpaper is 2160×3840, rendered at full size.

Where it's weaker: there is no prompt optimization (5.0 Pro's "thinking" mode is gone), so short prompts get less help; write out what you want. For posters and infographics with a lot of small text, GPT Image 2.6 is more reliable. ByteDance has not published benchmark scores for 5.5, and its layer-decomposition feature, which splits an image into editable layers, is not available on ZOOOP yet.

A reasonable mental model: make Seedream 5.5 the default for everyday image work and anything that needs a transparent background. Reach for GPT Image 2.6 for text-heavy layouts, Seedream 5.0 Pro when you want a short prompt expanded for you, and Nano Banana 2.1 for multilingual text and factual accuracy.

Frequently asked questions

What is Seedream 5.5?+

It is the newest image generation and editing model from ByteDance's Seed team, the successor to Seedream 5.0 Pro. One model generates images, edits them over many rounds, and outputs native transparent PNGs.

How does it compare with Seedream 5.0 Pro?+

Seedream 5.5 adds a 3K tier and the 21:9 ratio, outputs transparent backgrounds for new images and edits, and keeps unedited areas more stable during repeated edits. It drops the "thinking" prompt optimization that 5.0 Pro offers; if you rely on that, keep using 5.0 Pro.

How do I get a transparent background?+

Set Background to Transparent. The result is a PNG with an alpha channel. Auto lets the model decide from your prompt, and Opaque always gives a solid background.

How many reference images can I use?+

Up to 10. Leave the slot empty for text-to-image; add one or more images to edit them or combine them into a new scene.

Is Seedream 5.5 cost-effective?+

Yes. On ZOOOP it is priced well below Seedream 5.0 Pro at every resolution, so it is a good default for everyday work. Each reference image adds a small amount.

Is this the official ByteDance interface?+

No. ZOOOP is a third-party platform that accesses Seedream 5.5 through an API provider and is not affiliated with ByteDance. You only need a ZOOOP account.