ByteDance's Seedream 4.0 is a powerful AI image generation tool that outperforms Google's Nano Banana in several key areas. It unifies text-to-image generation and editing in one system, supports up to 4K resolution, and generates 2K images in under 2 seconds. Seedream 4.0's multi-reference input allows users to input up to 6 reference images for consistency, making it ideal for branding, storyboarding, and professional workflows. While Nano Banana excels for casual users, Seedream 4.0's professional features and higher resolution output make it a top choice for creators who need high-quality results.