Wang, H., Yu, T., Zhang, L., Wang, H., Jin, H., Zhou, Y., Wang, X., Yi, H., Li, X., Wang, Y., Nie, P., Huang, Y., Zhang, Y., Zhou, P., Zou, Y., & Yang, W. (2026). OPIS: An Input-Grounded Benchmark for Multi-Object Memory in Video World Models. https://omanscience.com/en/articles/opis-an-input-grounded-benchmark-for-multi-object-memory-in-video-world-models