Seedream 4.5 - now with 4k resolution at no extra cost! <a rel="ugc" href="https://bytedance.larkoffice.com/wiki/PsiHwrqPIi4i6okQZA0cwobnnEh?renamingWikiNode=true">Check out the extremely useful Official Guide to prompting Seedream 4.5, from Bytedance</a>!Details below originally posted to: <a target="_blank" rel="ugc" href="https://seed.bytedance.com/en/tech/seedream3_0">https://seed.bytedance.com/en/tech/seedream3_0</a>Technical InnovationCompared with our previous model Seedream 2.0, we employ several innovative strategies to address existing challenges, including limited image resolutions, complex attributes adherence, fine-grained typography generation, and suboptimal visual aesthetics and fidelity.This is primarily reflected in the following four aspects:• At the data tier, the dataset scale was expanded by approximately 100% with a novel dynamic sampling mechanism operating across two orthogonal axes: image cluster distribution and textual semantic coherence.• In the pretraining stage, we implement several improvements compared to 2.0, resulting in better scalability, generalizability, and visual-language alignment: i) Mixed-resolution Training; ii) Cross-modality RoPE; iii) Representation Alignment Loss; iv) Resolution-aware Timestep Sampling.• During post-training optimization, we leverage diversified aesthetic caption and VLM-based reward model to further improve model’s comprehensive capabilities.• In model acceleration, we encourage stable sampling via consistent noise expectation, effectively reducing the number of function evaluations (NFE) during inference.<img src="https://lf3-static.bytednsdoc.com/obj/eden-cn/pfpbyvbn/seedream%203.0%E9%85%8D%E5%9B%BE2.jpg" />Figure 1 Seedream 3.0 ranks first in the Artificial Analysis Image Arena Leaderboard. Due to missing data, the Portrait result for Imagen 3 and the Overall result for Seedream 2.0 are represented by the average values of other models.Iterative Model PerformanceCompared to Seedream 2.0, Seedream 3.0 achieves significant breakthroughs across multiple dimensions:• Native High Resolution: Natively supports 2K resolution output without post-processing, while also being compatible with higher resolutions and adaptable to various aspect ratios.• Comprehensive Capability Enhancements: Demonstrates significant improvements in text-image alignment, compositional structure design, aesthetic quality, and text rendering capabilities.• Significant Text Rendering Performance Enhancements: Excels in small font generation, Chinese character accuracy, and high-aesthetic long-text layout. The model tackles industry challenges in small-text generation and long-text layout, with graphic design outputs surpassing manually designed templates from platforms like Canva. Leveraging precise and aesthetically refined text generation capabilities, it enables the effortless creation of designer-level posters, seamlessly integrating diverse fonts, styles, and layouts.• Aesthetic Improvements: Achieves significant enhancements in image aesthetic quality, delivering strong performance in cinematic scene rendering and generating portraits with more realistic textures.• Lightning-Fast Generation Experience: Through multiple innovative acceleration technologies, inference costs are significantly reduced. End-to-end generation of 1K resolution images now takes only 3.0 seconds.<img src="https://lf3-static.bytednsdoc.com/obj/eden-cn/pfpbyvbn/%E7%81%B0%E5%BA%951%E4%B8%8D%E5%B8%A6%E5%9B%BE%E6%B3%A8.png" />Figure 2 Human evaluation results.Seedream 3.0 surpasses other models in terms of image-text matching, structure, and aesthetics.

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