Seedream 5.5 Was Released on November 9, 2026

Release date

ByteDance Seed released Seedream 5.5 on November 9, 2026 (2026-11-09). The model is out now. Source: ByteDance Seed, “Introducing Seedream 5.5”.

Release timeline

2026-02-24 — Seedream 5.0 Lite
2026-07-08 — Seedream 5.0 Pro
2026-11-09 — Seedream 5.5

About four months between releases. Earlier dates as compiled from ByteDance's Seed and BytePlus blogs by FourWeekMBA.

What changed from Seedream 5.0 Pro

Native transparent (RGBA) output — a PNG with an alpha channel straight from the model, no background removal.
Layer decomposition with more layers — a finished image split into separately editable PNG layers.
More accurate rendering of dense, small text.

Seedream 5.5 Pro

ByteDance Seed: “A Pro version of the Seedream 5.5 series will follow.” Release date: not announced by ByteDance.

Try Seedream 5.5 · Seedream 5.5 features