Princeton eval finds reasoning models fail structurally equivalent task variants, lacking systematicity
princetonu · hf · 2026-09-15
Princeton releases Thought without systematicity?, an evaluation of reasoning models on rule induction tasks.
Key finding: reasoning models frequently fail on structurally equivalent task variants — when surface form changes, models often cannot transfer rules they have already mastered. This indicates a lack of systematicity in their cognitive abilities, challenging the assumption that reasoning models truly reason.
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