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What is the difference between offline and online evaluation, and why do you need both?

Offline metrics gate releases; online metrics tell you what actually happened with users. The signal is knowing why offline wins routinely fail to hold online, and how the two feed each other.

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

Offline metrics gate releases; online metrics tell you what actually happened with users. The signal is knowing why offline wins routinely fail to hold online, and how the two feed each other.

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