Seedream 4.0

Seedream 4.0 is ByteDance's closed-source image generation and editing model (Sep 2025). It integrates text-to-image synthesis and reference-based editing in one unified architecture, producing up to 4K images. The model accepts up to 10 reference images and supports sequence mode for batch generation. It prioritizes balanced performance across quality, editing precision, and speed, making it versatile for knowledge-based visuals. Pricing starts from 5 CU for editing and 6 CU for generation.