Vapi tests Jev as a real-time guardrail for voice AI

Vapi ran early experiments using TypeSafe AI's early-access "System One" model Jev as a guardrail that scores whether a voice assistant's response violates a developer-defined rule before it is spoken. In one early test, Jev caught at least three out of four violating responses, though Vapi says it is not a 100% compliance guarantee and only an additional check on top of prompt guardrails.