> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Seedream 5.5 Is Live: 100-Round Editing, Native Transparency

> ByteDance's Seedream 5.5 (seedream-5-5-261028) is live on APIYI: unedited areas are preserved at the pixel level, so one image can take 100 rounds of edits, with native RGBA PNG, layer decomposition and text OCR. Output starts at $0.020 per image, with 2K and reference images billed separately.

**2026/11/13 10:30 (UTC+8)** · New Model · ByteDance

🚀 **`seedream-5-5-261028` is live: 100 rounds of edits on one image, with native transparency**

Seedream 5.5 is ByteDance's new image model, released on 9 November and served by APIYI through the official BytePlus channel in the `Default` and `SVIP` groups. Three upgrades stand out: pixel-level preservation outside edited areas, native RGBA output, and better realism with densely packed small text. Layer decomposition returns one base plus up to 99 layers, and text layers can include OCR content and positions.

Billing is now two-part, unlike the 5.0 series:

* Reference image: \$0.008 each
* 1K / 1.5K output: \$0.020 per image
* 2K / custom size output: \$0.035 per image

**Before you integrate**: omitting `size` bills at the 2K tier; `n` is silently ignored and `sequential_image_generation` returns 400; transparent output requires `background: "transparent"` with `output_format: "png"`, since `jpeg` has no alpha channel. Standard generation took 12–29 seconds in our tests, and this is a synchronous API, so set client timeouts to 60 seconds or more.

Full story: [Seedream 5.5 launch](https://docs.apiyi.com/en/news/seedream-5-5-launch.md). Pricing and measured charges: [Seedream 5.5 pricing](https://docs.apiyi.com/en/api-capabilities/seedream-image/seedream-5-5-pricing.md).

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