OpenAI launched the Advanced Voice feature in May during the GPT-4o release, achieving response times of 232 milliseconds and an average of 320 milliseconds. The rollout began in September for ChatGPT Plus and Team subscribers in the U.S. The feature expanded to users in the EU, Switzerland, Iceland, Norway, and Liechtenstein. Users can access it by downloading the latest version of the ChatGPT app. Advanced Voice is also available in the macOS and Windows desktop applications, with a daily usage limit. Recent enhancements include five new voices and features for custom instructions and conversation memory. During DevDay 2024, OpenAI introduced the Realtime API for developers, with pricing based on text and audio token usage.