Language Models Compare Quantities Using Number-specific and Unit-specific Heuristics
Quantities with measurement units, such as 110 cm and 1.2 m, require language models (LMs) to combine a numeral with a symbolic unit scale. Here, we study how LMs compare such quantities in controlled settings spanning several unit systems. We find that accuracy degrades near the comparison boundary, where small changes in value determine the correct answer. The resulting errors are systematic: linear surrogate models predict LM preferences from numerical-difference and unit-scale-difference cues, and causal interventions on subspaces aligned with these variables shift model's output. The results suggest that LMs compare quantities through a bag of heuristics over numerals and units, rath...
| Authors | Mutsumi Sasaki, Go kamoda, Ryosuke Takahashi et al. |
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| Primary category | cs.CL |
| Published | 2 June 2026 |
| Last updated at source | 16 August 2026 |
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