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Why Your LLM App Works in Demo but Fails in Production

This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.

The Demo Was Perfect I've done this more times than I'd like to admit. Build an LLM app. Test it with 10 carefully chosen questions. The answers are beautiful — accurate, well-formatted, exactly what I wanted. Record a screen capture. Post it on Twitter. "Look what I built this weekend." Then I sha…

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  1. 2026-09-12 01:30 · DEV Community — AI
    Why Your LLM App Works in Demo but Fails in Production

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