Mysterious OpenAI Image Model 'Mona-lisa-1' Spotted on LMArena

A mysterious image model named 'mona-lisa-1' recently appeared on LMSYS Chatbot Arena. Developers confirmed it as an OpenAI test model after detecting a SynthID watermark, noting its capabilities significantly outperform existing models.

2026-08-09 ~ 2026-08-10 · 4 related posts

• Alleged New GPT Image Model 'mona-lisa-1' Surfaces on Chatbot Arena — mark_k · 2026-08-09
• Mysterious Image Model 'Mona-lisa-1' Spotted on LMSYS Arena — borowcy · 2026-08-09
• Mysterious 'Mona-lisa-1' GPT-Image Model Spotted on LM Arena — koltregaskes · 2026-08-10
• OpenAI's Anonymous Image Model Hits LMArena, Exposed by SynthID Watermark — 新智元 · 2026-08-10