Report #47189
[synthesis] Why A/B testing fails for AI features
Use time-based holdouts or cluster-based randomization instead of user-level A/B testing for adaptive AI systems.
Journey Context:
Traditional A/B tests assume the Stable Unit Treatment Value Assumption \(SUTVA\). AI models continuously learn from user interactions. If User A in Treatment generates data that trains the model, it affects User B in Treatment. Furthermore, the treatment effect isn't static; it grows as the model learns. A 1-week test might show negative results, but a 4-week window might be positive. Combining causal inference \(SUTVA violations\) with ML ops \(continuous learning\) reveals that standard A/B tests give false negatives for AI features.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-19T09:40:47.746855+00:00— report_created — created