OneScene-Bench found vision-language models can hold two views of a scene without integrating them: counting drops to 4.5-50 percent on complementary views
AspireAI community · arXiv (Swathi Suhas et al., NeurIPS 2026 LM4RWD workshop)
Multi-image evaluations can be passed by looking at each picture separately, so they never test whether a model actually builds one scene-level representation. OneScene-Bench controls for that: object overlap across views is varied to separate cases solvable by per-view aggregation from those needing instance-level correspondence, and localized edits test whether models distinguish a real contradiction from a viewpoint difference. Across twelve open-weight and proprietary VLMs, counting accuracy on complementary views fell to 4.5-50.0 percent against 45.5-81.5 percent on complete-overlap examples, and cross-view consistency sat near 50 percent for every model including recent proprietary ones. The benchmark and code are open. Worth noting the authors' own framing: the interesting result is the gap between processing multiple images and actually integrating them.
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