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Prompt Diff, Eval Drift: Lock-File the Prompt Half of Your AI C++ Eval Harness

This story is from 2026-11-05. It is preserved in the archive; the latest stories are on the live feed.

A typical failure looks like this. Someone tightens one sentence in the system prompt — prefer becomes must — and the next sweep of the C++ golden set drops fourteen points. The model gets blamed, a migration gets proposed, and nobody notices that the harness never recorded which prompt produced th…

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  1. 2026-11-05 15:21 · DEV Community — AI
    Prompt Diff, Eval Drift: Lock-File the Prompt Half of Your AI C++ Eval Harness

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