Is my new prompt working better than the old one?
You answer that by comparing behavior before and after the deploy on the same real traffic, not by eyeballing a few outputs. Flowlines pins every signal rate, success rate, cost, and latency to the deployed prompt version, so each release gets a before/after panel that shows what it measurably did.
The honest answer to “is the new prompt better” is rarely obvious from spot-checking outputs. Better on what, for whom? A prompt can improve quality and quietly double cost, or fix one cohort and regress another.
Flowlines treats every prompt deploy as a version and pins your metrics to it. The /versions page shows the before/after for each release: signal severity mix, success rate, cost per session, latency. A regression shows up as a clear step on the timeline the day it ships.
You can pin any two versions to compare them directly, and break the comparison down by intent or cohort, so “better” becomes a specific, defensible claim instead of a vibe.
Last updated 2026-05-28