# Why o1's Planning Accuracy Collapses 78% When Spatial Reasoning Joins Verbal

- slug: why-o1s-planning-accuracy-collapses-78-when-spatial-reasoning-joins-verbal
- date: 2026-03-23
- category: Artificial Intelligence

When a new paper asks whether large language models can actually plan a trip — not just describe one — the answer turns out to be nearly zero.

ItinBench, a benchmark developed by researchers at the University of Virginia, tests LLMs on itinerary planning across two cognitive dimensions simultane...

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