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
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. Pricing and measured charges: Seedream 5.5 pricing.
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