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According to the ByteDance Seed official blog (November 9, 2026), Seed launched Seedream 5.5, a new image creation model aimed at stabler multi-turn edits on the same artwork and native transparent or semi-transparent assets for overlays.

What Seedream 5.5 adds

Seed highlights three upgrades:

  • Stabler multi-turn editing. Unedited regions stay at pixel level, with less color drift and detail loss across successive changes. Seed says the model can keep working on the same image for up to 100 rounds.
  • Native RGBA. The model can output images with an alpha channel, including full and partial transparency, so edges and see-through areas need less separate matting.
  • More realistic look and clearer small text. Seed describes less gloss and overexposure, plus denser small-type rendering.

That fits cover iterations that keep changing one image, and overlay packs that need transparent or semi-transparent layers.

MagicArena evaluations

Seed’s MagicArena evaluations use experienced image-generation reviewers across six production settings: e-commerce, marketing, film and TV, gaming, office, and fashion design. Versus Seedream 5.0 Pro, Seed says usability rates and MOS improved across all six cases, and that film/TV and office usability were more than twice the previous version.

Official MagicArena chart: Seedream 5.5 vs Seedream 5.0 Pro usability rate and MOS across six business use cases
Official MagicArena chart: Seedream 5.5 vs Seedream 5.0 Pro usability rate and MOS across six business use cases

*Official MagicArena chart from the Seed blog: usability rate and MOS versus Seedream 5.0 Pro.*

View original image For text structure and realism, reviewers scored paired outputs with GSB (Good/Same/Bad) preference scores on both text-to-image (T2I) and image-to-image (I2I). Positive GSB favors Seedream 5.5; this is a relative preference score, not a success rate. Versus Seedream 5.0 Pro, all four text-structure/realism cells are positive, with realism I2I at +55.62%. Versus Nano Banana 2.1, realism I2I is −6.18% (that comparator preferred). The chart also compares GPT Image 2.5 Sunburst.

Official MagicArena GSB chart for Seedream 5.5 text structure and realism (T2I and I2I), including a −6.18% realism I2I vs Nano Banana 2.1
Official MagicArena GSB chart for Seedream 5.5 text structure and realism (T2I and I2I), including a −6.18% realism I2I vs Nano Banana 2.1

*Official MagicArena GSB chart from the Seed blog: text structure and realism (T2I / I2I) versus GPT Image 2.5 Sunburst, Nano Banana 2.1, and Seedream 5.0 Pro.*

View original image On text rendering quality, Seedream 5.5’s severe text corruption rate is 0.4% and its minor rate is 1.7% (lower is better).

Official MagicArena text rendering chart: Seedream 5.5 severe text corruption 0.4% and minor 1.7% (lower is better)
Official MagicArena text rendering chart: Seedream 5.5 severe text corruption 0.4% and minor 1.7% (lower is better)

*Official MagicArena text-rendering chart from the Seed blog: severe 0.4%, minor 1.7% for Seedream 5.5 (lower is better).*

View original image

Where to try it, and Pro next

The Chinese Seed blog says Seedream 5.5 is rolling out on Dreamina (即梦), Doubao, Doubao Work, and Volcano Ark. Experience paths listed there include Dreamina web (create → generate/canvas → Seedream 5.5), Doubao app/web image generation, Doubao Work skills, and the Volcano Ark experience center under visual models → image generation → Doubao-Seedream-5.5. Seed also says a Pro version of the Seedream 5.5 series will follow.