Vibe coding got expensive because the loops add up, and Amazon’s Darko Mesaros says Kiro’s spec-first approach cuts them short

Vibe coding made AI agents cheap to start and costly to finish, since every loop is billed and each one carries the last. Amazon’s Kiro settles a written specification first, routes work to the smallest model that fits, and keeps context stable enough to cache. AWS developer advocate Darko Mesaros says the slower start is why he rarely writes the same thing twice.
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