Seedream 5.5 AI Image Generator
Prompt and up to three reference photos. 1K and 1.5K cost 6 credits, 2K costs 10.
How to generate an image
- Write a prompt Describe the subject, the light, and the surface. Put any words that must be readable in quotes. If you attach a photo, name the change and what should stay the same.
- Set the frame Pick an aspect ratio. Low is 1K, Standard is 1.5K, and High is 2K. Up to three reference photos can be attached.
- Generate and download Sign in. The credit chip shows 6 at 1K or 1.5K, and 10 at 2K, times the number of images. The result opens in your generations.
Why generate on Tyndall
- Multi-turn edits. Attach the previous result and name the change. The prompt should say what stays the same.
- Transparent PNG. Ask for a transparent background in the prompt. The file is PNG, so it can carry an alpha channel.
- 1K, 1.5K, and 2K. Low is 1K, Standard is 1.5K, and High is 2K. This model does not output 4K.
- 6 or 10 credits. 1K and 1.5K cost 6 credits. 2K costs 10. The chip shows the charge before a run.
What Seedream 5.5 is for
ByteDance announced Seedream 5.5 on 9 November 2026 as the next image model after Seedream 5.0 Pro. The published brief is three jobs: keep editing the same picture for many rounds, hand off a file that already has a transparent background, and render light, materials, skin, and small text closer to a photograph.
Multi-turn editing is the part that changes a production workflow. ByteDance says unedited regions stay at the pixel level, including color, and that the same image can go through on the order of 100 rounds before detail falls apart. A poster, a product, or a character sheet that needs a sequence of small corrections is the fit. Each round still needs a prompt that names the change and leaves the rest alone.
Transparent output is native RGBA. The model can emit a full or partial alpha channel, with edges already resolved, so a sticker, an icon, or a game prop can skip a separate cut-out. Published API cards return PNG when the background is transparent. JPEG cannot carry that alpha.
Text and photographic surfaces are the other published gains. Complex glyphs and dense small type are called out specifically, as are lighting, materials, and skin with less gloss and less blown highlight. A label, a shop window, or a Chinese poster is the same kind of prompt as on earlier Seedream pages: put the exact words in quotes, in the language they should appear.
This page generates that model. Attach up to three reference photos when the result has to follow a picture you already have. A later round uses the previous result as the reference and a prompt that names the change. Seedream 5.0 Pro stays the page for 1K or 2K without the 1.5K step.
Seedream 5.5 vs the other versions
Each row is a Seedream page on Tyndall, with the sizes and credits that page charges.
| Version | On Tyndall | Sizes | References | Credits |
|---|---|---|---|---|
| Seedream 5.5 | Generates now | 1K, 1.5K, 2K | Up to 3 | 6 at 1K and 1.5K, 10 at 2K |
| Seedream 5.0 Pro | Generates now | 1K, 2K | Up to 3 | 10 at 1K, 20 at 2K |
| Seedream 5.0 Lite | Generates now | 2K, 3K | Up to 3 | 12 |
| Seedream 4.5 | Generates now | 2K, 4K | Up to 3 | 12 |
| Seedream 4.0 | Generates now | 1K, 2K, 4K | Up to 3 | 8 |
| Seedream 3.5 | Text to image | 1K, 1.5K, 2K | No | 0 |
Stay on this page for a 5.5 file at 1K, 1.5K, or 2K. Open Seedream 4.5 or Seedream 4.0 when the file has to be 4K. Seedream 5.0 Pro is the 1K or 2K page without a 1.5K step, at 10 or 20 credits.
What this page returns
This page returns one image per request at 1K, 1.5K, or 2K. Low is 1K, Standard is 1.5K, and High is 2K. Up to three reference photos can be attached. A prompt that asks for a transparent background returns PNG, which can carry the alpha channel. There is no 4K on this model.
Credits are 6 per image at 1K and 1.5K, and 10 at 2K. The credit chip on the generator shows the charge before a run. Those credits come from a plan or a pack on Pricing. Paid subscribers may use Tyndall downloads for commercial work under the Terms of Service. An account that is not on a paid plan is limited to personal, non-commercial use.