Test the best models
Automated testing, promotion and rollback
A new model goes live only when it beats the current one, and comes back out automatically if live performance drops.
Promotion is conditional: a candidate has to beat the incumbent on the metrics you agreed and stay inside your quality, diversity, latency and cost guardrails.
Releases run in shadow first, then as a canary against a small share of traffic, with automatic rollback if the live numbers move the wrong way.