Reproduce “When Reasoning Traces Become Performative: Step-Level Evidence that Chain-of-Thought Is an Imperfect Oversight Channel” on OpenResearch
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About this paper
Wenkai Li, Fan Yang, Ananya Hazarika, Shaunak A. Mehta, Koichi Onoue
Researchers developed a framework to measure the temporal alignment between large language models' internal answer commitment and their explicit Chain-of-Thought (CoT) traces at a step-level. The study found that internal answer formation aligns with CoT articulation on only about three-fifths of steps, with "confabulated steps" making up 58% of mismatches, and revealed a negative correlation (r=-0.42) between step-level alignment and CoT utility.
Key insights
- CoT traces frequently do not faithfully reflect the temporal dynamics of a model's internal reasoning, as models often commit to an answer internally before explicitly articulating it.
- "Confabulated Steps," where models continue generating deliberative-looking text after internal answer commitment, represent the dominant form of temporal unfaithfulness (58% of mismatches) and are largely causally inert.
- Reasoning-oriented training pipelines can significantly change the composition of faithfulness failure types across model scales, even if aggregate alignment is stable.
- A capability-oversight trade-off exists, where settings yielding high CoT utility (performance gains) tend to exhibit lower step-level temporal faithfulness.
Summary by alphaXiv.
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