When the Model Knows but Doesn't Remember: The Hidden Blind Spot in LLM Contamination Detection
Opening — Why this matters now AI benchmarking is quietly facing a credibility crisis. Every major language model claims progress on standardized benchmarks—math reasoning, coding, scientific problem‑solving. But there is a persistent suspicion underneath many impressive results: what if the model has simply seen the answers before? This problem, known as data contamination, occurs when evaluation questions appear in the model’s training data. Once contamination happens, benchmark scores stop measuring reasoning ability and start measuring memorization. ...