The September 24 2025 paper is a technical report from ByteDance Seed detailing the Seedream 4.0 system, an advanced multimodal image generation model. This single framework efficiently unifies text-to-image synthesis, image editing, and multi-image composition. The core innovation is an efficient diffusion transformer and powerful VAE that facilitates fast generation of high-resolution images (up to 4K), outperforming competitors like GPT-4o and Gemini 2.5 in human and automatic evaluations. The system uses sophisticated training techniques, including multi-modal post-training and adversarial acceleration methods, to achieve state-of-the-art results and ultra-fast inference speed. Seedream 4.0 is designed for both creative and professional applications, featuring capabilities like in-context reasoning and advanced text rendering. Source: https://arxiv.org/pdf/2509.20427