Model Card: OpenMOSS MOSS-Image
MOSS-Image: a 5B single-stream diffusion transformer released 2026-10-16 by OpenMOSS (MOSI.AI / Shanghai Innovation Institute / Fudan University / Shanghai Jiao Tong University), Apache-2.0, prompts up to 4,096 tokens, paired with a GPT-6-driven agentic prompt enhancer for layout planning. On its own LLTB long-text benchmark it scores 96.3 Mean-6 (highest among open-weight models, 31.4 points above the next-best Qwen Image 2512 at 64.9); on 7Bench layout control it scores 0.88 mIoU / 0.70 AUC, far ahead of Ideogram 4's 0.44 / 0.20; on RealLayoutArena end-to-end human evaluation it ranks second of nine systems (1698.70 Elo), behind GPT Image 2 (1844.35) but ahead of Seedream 5.0 Pro, Qwen Image 3.0 Pro, and Nano Banana Pro — yet its bare backbone tops the field (1807.34 Elo) when every system is given the same enhanced prompt. All benchmarks are self-constructed and self-evaluated by OpenMOSS, with no third-party reproduction yet; the model does not support image-conditioned input or editing, and there is no official API pricing.