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How do you migrate to a new embedding model on a live 50M-vector index without downtime or quality regressions?

A better embedding model is useless if old and new vectors share an index, because their spaces are incompatible. The signal is the dual-index re-embed-then-cutover plan, the cost math, and how to prove the new model is actually better before you flip.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A better embedding model is useless if old and new vectors share an index, because their spaces are incompatible. The signal is the dual-index re-embed-then-cutover plan, the cost math, and how to prove the new model is actually better before you flip.

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