Data leakage in machine learning

Empty Kaggle proxy captures scored DeepSeek-R1 at 17% on a benchmark where it reaches 100%

Blog vs Bytecode, a 28-item Kaggle benchmark, graded empty proxy responses as wrong and scored DeepSeek-R1 at 17% until a second gateway showed 100%. Once capture was fixed, frontier models lost points by flagging sound code, while a small Gemma model missed most of the planted flaws.