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Replay Cassettes Separate Harness Drift from Model Drift

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

A prompt suite has three moving parts — prompt text, the grader, and the model snapshot — and a single pass-rate number moves whenever any one of them changes. Replay cassettes remove that ambiguity by freezing model output on disk and letting you re-run only the parts you actually edited. The rule…

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  1. 2026-10-20 10:18 · DEV Community — AI
    Replay Cassettes Separate Harness Drift from Model Drift

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