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Design an embedding-keyed semantic cache for LLM responses that hits on similar prompts without serving wrong answers.

Cache hits on similar prompts cut cost and latency, but one false hit serves a stranger's answer to your question. Picking the threshold and handling user-specific data is the whole game.

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

Cache hits on similar prompts cut cost and latency, but one false hit serves a stranger's answer to your question. Picking the threshold and handling user-specific data is the whole game.

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