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10 rounds. Every round shows N images that match the same subject — exactly one is AI-generated. Your odds: 1 in 4.
Images mirrored from sightengine.com/ai-or-not (credited with thanks). Every round's distractors are the nearest DINOv2 visual matches to the AI image, above a quality cutoff — same scene class, no topic giveaways. Built by mesfits.