REALIS: A Curated Dataset for Studying the Challenges of AI Image Detection

Aleksandr Gushchin; Khaled Abud; Georgii Bychkov; Ekaterina Shumitskaya; Artem Filippov; Sergey Lavrushkin; Dmitriy S. Vatolin; Anastasia Antsiferova

arXiv · 2609.32734

REALIS: A Curated Dataset for Studying the Challenges of AI Image Detection

Aleksandr Gushchin·Khaled Abud·Georgii Bychkov·Ekaterina Shumitskaya·Artem Filippov·Sergey Lavrushkin·Dmitriy S. Vatolin·Anastasia Antsiferova

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Abstract

AI-generated image detectors are often evaluated on benchmarks where real and synthetic images differ in content, quality, or generation artifacts, allowing models to rely on dataset-specific cues and fail on unfamiliar generators or processed images. Existing datasets provide limited support for evaluating these challenges jointly across diverse visual content. We introduce REALIS, a dataset of 1.43 million real and synthetic images generated by 42 modern text-to-image models, including the latest proprietary systems such as Nano Banana 2. REALIS combines prompts derived from real images, quality filtering, and stratified sampling to reduce class-specific shortcuts while preserving content diversity. We further introduce REALIS-Expert, a stress-test subset for high-quality synthetic images, where real and generated samples are selected with closely matched semantic and visual characteristics. We also propose a robustness protocol covering 35 transformations at five severity levels to analyze detector behavior under image processing. Based on REALIS, our benchmark evaluates pretrained detectors, fine-tuned models, and zero-shot vision-language models under generator and post-processing shifts. On the hardest processed split, the best pretrained conventional detector achieves 0.550 ROC-AUC, compared with 0.752 for the best REALIS-trained detector. REALIS provides a unified framework for measuring and improving the reliability of AI-image detectors under conditions that better reflect real-world use.

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Aleksandr Gushchin, Khaled Abud, Georgii Bychkov, Ekaterina Shumitskaya, Artem Filippov, Sergey Lavrushkin, Dmitriy S. Vatolin, Anastasia Antsiferova. 2026-09-26. REALIS: A Curated Dataset for Studying the Challenges of AI Image Detection. https://arxiv.org/abs/2609.32734

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