S
Vapi
Developer platform to build, test and deploy voice AI agents.
WebsiteProvisional comparison
Vapi vs OpenAI Realtime API
Vapi is provisional S-tier and OpenAI Realtime API is provisional A-tier on Voice Agents. Rankings are never for sale.
OpenAI's low-latency speech-to-speech API for voice agents.
Website| Field | Vapi | OpenAI Realtime API |
|---|---|---|
| Tier | S · provisional | A · provisional |
| Why | Developer-favorite voice agent platform with flexible model choice. | First-party speech-to-speech models; pairs with the Agents SDK. |
| Pricing | usage-based · starts at ~$0.04–0.09/min | usage-based (API) |
| Last verified | Oct 15, 2026 | Oct 15, 2026 |