At 04:00 on December 4, the Seed team under ByteDance quietly launched Seedream 4.5, which is another major update following Seedream 4.0 in August this year. The official claims that this upgrade focuses on "multi-image scene consistency" and "aesthetic instruction following," and the actual test results have completely eliminated the previous most embarrassing "split personality" pain point of image models.
Multi-image fusion finally doesn't crash: characters, costumes, lighting, and composition are highly consistent
Previously, almost all image models would encounter disastrous issues when generating multiple images, such as "the same character has different faces," "clothes colors change by themselves," or "lighting directions fly everywhere." Seedream 4.5 achieved a high level of consistency in character identity, clothing details, scene lighting, and artistic style across multiple images in the same batch through a newly designed cross-image consistency module.
Test results show:
- The same character has almost no deviation in eyes, hairstyle, and facial features in a 9-grid layout;
- Complex clothing textures remain completely consistent at different angles and movements;
- Lighting direction, tone, and atmosphere are strictly unified across all sub-images.
Industry insiders exclaimed: This is truly "mass-produced movie-level original footage."
Aesthetic instruction following has greatly improved: whatever you say, it will be as you wish
Seedream 4.5 also made a leap in aesthetic control. Whether it's "cyberpunk night view + film grain effect," "Korean-style Instagram style + cream light," or "90s Hong Kong style magazine cover," the model can accurately hit the style keywords, without any "understanding bias" or "style mixing."
Especially when complex modifiers are overlapped (for example, "misty morning forest, cinematic cold tone, film grain, Fujifilm Superia tone"), the visual quality and description match reach the highest level among publicly available models.
Directly challenge Flux, Midjourney v6.1: a blessing for detail-oriented users
Compared to current mainstream top models, Seedream 4.5 has no obvious shortcomings in traditional difficult areas such as hand rendering, text rendering, and complex clothing wrinkles. Combined with the advantage of full multi-image consistency, it has the ability to dominate in commercial scenarios such as e-commerce posters, mass production of IP characters, and rapid iteration of illustrators' concept drafts.
AIbase exclusive comments
While everyone's attention was still on the video model battle, ByteDance used a single static image to firmly fill in the last and hardest piece of the image generation puzzle—consistency. Seedream 4.5 didn't engage in a parameter arms race but precisely solved the most painful practical issues in the industry. This is the most solid way of competition from Chinese teams.
Multi-image stability plus aesthetic perfection, ByteDance has once again raised the "ceiling" of image generation.
The image generation race in 2025 is really getting more exciting.
