Reading up on Vapi

By piping Deepgram Flux, Groq's LLM, and ElevenLabs TTS with geographic optimization, the author achieved ~400ms end-to-end voice agent latency, beating Vapi by 2x.

In 2025, voice AI APIs cost $5–$32/hour, making them more expensive than human call center workers in most developing countries until inference costs drop around 2030.