What is Regression?
A drop in quality on something that used to work, caused by a model, prompt or harness change. In AI products it can hide inside an average that went up, so compare scores by slice, not just overall.
average up · refund channel down
After a model change, the team reports a regression. That means…
Write it in your own words in the app.
In real work
The new model lifted the overall score but caused a regression on refund tickets, so the PM weighed a prompt fix, a narrower feature, or a training request.
In the illustration
Paper rolls past a marked change line. After it, three pens step up to new highs while the fourth pen, the refund channel, steps down below its old line.
Find the regression in your model: compare old and new model outputs on these 100 tickets, list the cases that got worse, group them by cause, and suggest a prompt fix for each group.
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