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What are MMLU, HumanEval, and GSM8K, and how do you interpret LLM benchmark scores?

Everyone quotes benchmark scores; few read them honestly. The signal is naming what each probes and why leaderboard numbers run ahead of real-world ability. The follow-up the interviewer is holding back is how you would detect contamination.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Everyone quotes benchmark scores; few read them honestly. The signal is naming what each probes and why leaderboard numbers run ahead of real-world ability. The follow-up the interviewer is holding back is how you would detect contamination.

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