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The AI speaking tutor is four API calls in a trenchcoat

I build an English vocabulary app for Vietnamese learners. One feature — "speak, get scored, get a spoken reply" — turned out to be four sequential network hops, and most of the interesting bugs lived in the seams between them. I'll only publish numbers I actually measured in production. Where I do…

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  1. 2026-11-06 09:19 · DEV Community — AI
    The AI speaking tutor is four API calls in a trenchcoat

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