Masa Shimizu

GPT 4.1-mini is fast. It is reasonable to allow us to provide a Voice AI Agent to customers.

Its deep context understanding fuels our most advanced agent features.

We chose Vapi because the voice quality is incredibly natural and the experience is smooth and intuitive. The orchestration is thoughtfully designed, and it’s truly developer-friendly — making it easy to integrate and work with. It’s one of the few voice platforms that feels great to use, both for users and builders.