There are no watermarks in the arena.
There are no visible watermarks, but model makers can use steganographic codes to identify outputs from their own models.
Readit NewsThis outperforms Gemini 3 pro image (nano banana pro) on Text-to-Image Arena and Image Edit Arena. I'm surprised they didn't mention this leaderboard in the blog post.
I like this benchmark because its based upon user votes, so overfitting is not as easy (after all, if users prefer your result, you've won).
The arena concept doesn’t work for image models due to watermarks.
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https://arxiv.org/pdf/2510.06525