A hierarchical diagnostic benchmark for counting stacked 3D objects shows that MLLMs often reach correct totals without executing the human-like prerequisite sub-tasks, and that training on those sub-tasks markedly improves accuracy.
Claude opus 4.6, 2026
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Spatial-IQ: Deconstructing Spatial Intelligence via Hierarchical Capability Tests
A hierarchical diagnostic benchmark for counting stacked 3D objects shows that MLLMs often reach correct totals without executing the human-like prerequisite sub-tasks, and that training on those sub-tasks markedly improves accuracy.