Why it matters

A/B shapes production improvement. Understanding shapes ops.

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The architecture

Feature flag routes traffic.

Collect metrics per variant.

Statistical test.

Prompt A/B flowFeature flagroute trafficVariants A / Brun in parallelMeasure + testdeclare winnerStandard experimentation tools (LaunchDarkly, GrowthBook) support this
A/B test.
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How it works end to end

Feature flag per prompt version.

Metrics: quality (via judge), latency, cost.

Statistical significance.

Guard rails: rollback on bad.