The illusion of reasoning: step-level evaluation reveals decorative chain-of-thought in frontier language models

Researchers have developed a method called step-level faithfulness evaluation to assess whether language models genuinely use reasoning steps or merely generate them decoratively after deciding on an answer. This technique reveals that reasoning in advanced models falls into three modes: genuine reasoning where steps are essential, scaffolding where CoT helps but is interchangeable, and decoration where CoT adds no value. This matters because it highlights the need for more rigorous evaluation of model transparency and internal processes.

Read the full article at arXiv cs.CL (NLP)

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