The Illusion of Reasoning: Exposing Evasive Data Contamination in LLMs via Zero-CoT Truncation

arXiv:2605.21856 · cs.LG, cs.AI · Submitted 2026-05-21 · Read on arXiv

cs.LG, cs.AI

Submitted: 2026-05-21

Updated: 2026-10-25

Terminology

• Benchmark — 2× in this paper · explained in 2 episodes
• Memorization — 2× in this paper · explained in 4 episodes
• Chain-of-Thought (CoT) — 1× in this paper · explained in 5 episodes
• Language Models (LLMs) — 1× in this paper · explained in 2 episodes
• Large Language Models (LLMs) — 1× in this paper · explained in 9 episodes
• Zero-CoT Probe — 1× in this paper

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