ByteDance Introduces Seedream 5.5 Image Creation Model

ByteDance's Seed Team has introduced Seedream 5.5, which it describes as its next-generation image creation model. According to the team, the model supports multi-turn editing across 100 rounds while preserving unedited regions at the pixel level, which aims to eliminate color shifts and reduce detail loss. Seedream 5.5 also introduces native RGBA asset generation, creating images with an alpha channel for full and partial transparency. ByteDance says this allows generated elements to enter design workflows as standalone assets without separate background removal or edge cleanup. Creators can generate these assets with transparent backgrounds from text descriptions or reference images.

The team states the model renders lighting, materials, and skin textures more naturally while reducing gloss and overexposure. For text generation, the model reproduces character shapes and small text in Chinese and English. ByteDance reports that in evaluations, severe text corruption fell to 0.4% and minor text corruption dropped to 1.7%. Evaluations on the MagicArena platform tested the model across six use cases: e-commerce, marketing, film and television, gaming, office productivity, and fashion design.

According to ByteDance, usability rates in film and television and in office productivity were more than twice those of Seedream 5.0 Pro. In evaluations against the previous version, Seedream 5.5 reached +55.62% for realism in image-to-image tasks. Compared with models such as GPT Image 2.5 Sunburst and Nano Banana 2.1, ByteDance says Seedream 5.5 leads in text structure across both text-to-image and image-to-image tasks and shows an advantage in text-to-image realism.