Introduction

We’re also releasing our most advanced speech-to-speech model yet—gpt-realtime. The new model shows improvements in following complex instructions, calling tools with precision, and producing speech that sounds more natural and expressive. It’s better at interpreting system messages and developer prompts—whether that’s reading disclaimer scripts word-for-word on a support call, repeating back alphanumerics, or switching seamlessly between languages mid-sentence. We’re also releasing two new voices, Cedar and Marin, which are available exclusively in the Realtime API starting today.