After length-correcting hidden-state trajectories during chain-of-thought, reasoning models show systematically different geometry on harder problems than baselines, strongest in competitive programming.
LLMs encode how difficult problems are.arXiv preprint arXiv:2510.18147,
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Reasoning Models Don't Just Think Longer, They Move Differently
After length-correcting hidden-state trajectories during chain-of-thought, reasoning models show systematically different geometry on harder problems than baselines, strongest in competitive programming.