Developer's pilot AI agent calls him back by phone; Vapi beats OpenAI on voice-stack cost

alexcovo_eth · x · 2026-09-11

Indie developer alexcovoeth shares a surreal moment: a client pilot agent he forgot he was testing called him — he'd sent an email and the agent responded by phone.

His stack uses Vapi for phone service and the client-facing AI layer; he reports it works really well and costs a fraction of OpenAI's offering — less real-time, but on price he's sticking with it for now.

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