OpenAI WebRTC Audio Session adds GPT-Realtime-2 model and document context input
Simon Willison's browser-based audio conversation tool, originally built in December 2024 to test the OpenAI WebRTC realtime audio API, has been updated. It now supports the GPT‑Realtime‑2 model, which OpenAI promotes as its first voice model with GPT‑5-class reasoning and a knowledge cutoff of September 30, 2024. A new feature allows users to paste document context, enabling interactive voice Q&A about the provided content. The update makes the newer model available for experimentation while the model has not yet appeared in the ChatGPT iPhone app.