OpenAI and LiveKit have partnered to create an API that allows developers to use the same technology powering ChatGPT's Advanced Voice feature in their own applications. The new Multimodal Agent API, which includes built-in support for OpenAI's Realtime API, enables developers to build apps with GPT-4o that can listen and speak to users in real-time. This partnership aims to give developers access to the same tools and APIs used by OpenAI in their own applications, promoting innovation and creativity in AI development.