AI Technology
Testing Seedream 4.0
Is it better than Nano Banana?
Framia Team
September 2025
8 min read
What Is Bytedance's Seedream 4.0?
Seedream 4.0 is Bytedance's revolutionary image model that puts generate + retouch in the same brain. In plain terms, it aims to:
Flexible Aspect Ratios
Specify custom output dimensions for any use case
4K Resolution Output
Generate ultra-high quality images up to 4K resolution
Multiple Reference Images
Upload up to 6 reference images for enhanced accuracy
Photorealistic Quality
Industry-leading realism that rivals professional photography
Bytedance's Seedream 4.0 is already live-you can find it integrated in our Framia platform. And instead of worrying “which model should I use,” our Agent workflows pick the best one for the job automatically.
How to use Seedream 4.0 in Framia?
Discover Bytedance's Seedream 4.0: stable faces, natural edits, real lighting.Answer the question we all care about: Nano Banana, Seedream 4.0, which is better? Both models are available in Framia, so you can try them side by side and see which works best for your project.
Seedream 4.0 vs Nano Banana
Both Seedream 4.0 and Nano Banana are powerful AI image generation models, but they differ in key capabilities that matter for specific use cases. Here's how they stack up:
Flexible Aspect Ratio Support
Seedream 4.0 allows you to specify custom output aspect ratios, while Nano Banana is limited to standard dimensions. This is crucial for video creation since video models require specific aspect ratios, and essential for posters, social media content, and graphic design where precise dimensions matter.
4K Resolution Output
Seedream 4.0 generates images up to 4K resolution for professional-quality results, while Nano Banana is limited to lower resolutions. This makes Seedream ideal for high-end creative projects, print materials, and detailed visual work.
Reference Image Capacity
Seedream 4.0 accepts up to 6 reference images for enhanced accuracy and style guidance, while Nano Banana can handle up to 8 reference images. This gives Nano Banana a slight edge for complex compositions requiring multiple style and content references.
Multiple Output Generation
Seedream 4.0 features a unique capability to generate multiple images simultaneously from a single prompt. For example, you can provide a person's photo and ask for different moods or expressions, and the model will create several variations at once. This feature is exclusive to Seedream and not available in Nano Banana.
Seedream 4.0 vs The Rest: AI Image Model Showdown
| Model | Face Consistency | First-Try Success | Speed | Image Quality | Rating |
|---|---|---|---|---|---|
| Seedream 4.0 | 95%+ | 9/10 | 0.8-2 min | 9.5/10 | |
| Nano-Banana | 90% | 7/10 | 1-2 min | 9/10 | |
| Gemini 2.0 | 70% | 6/10 | 3-6 min | 8.5/10 | |
| Previous Seedream | 40% | 3/10 | 4-8x faster | 8.0/10 | |
| FLUX Kontext | 60% | 5/10 | 3-5 min | 7.0/10 |
While both Nano-Banana and Seedream 4.0 are game changers in AI image generation,Seedream 4.0 has a distinct advantage: the ability to customize aspect ratios of output images. This flexibility allows creators to generate content perfectly suited for any platform or use case, from square social media posts to wide banner images.
Take your images further with Framia workflows
With Seedream 4.0 inside Framia, a finished image is where the next step begins. Chain tasks into workflows— move from stills to motion, place visuals into layouts, explore looks, and export in the sizes your channels need.
Build motion from stills
Convert images into short clips with style transfer and identity consistency.
Design-ready layouts
Place images into responsive templates with brand kits and export presets.
Style and look development
Iterate non-destructively across aesthetics and lighting to find a direction.
End-to-end delivery
Versioning, annotations, and exports for social and ad platforms in one place.
Conclusion
Seedream 4.0 focuses on consistency and realism: faces remain stable, garments read as authentic, fine details hold up, and lighting integrates with the environment. This moves results from experimental to publish‑ready across portraits, products, and stylized imagery. With Framia, you can take it further—text‑to‑video, poster design, audio generation, and style workflows— so you can generate, edit, and publish in one place.
Ready to Try Seedream 4.0?
Experience the next generation of AI image editing with Framia's all-in-one creative platform.