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Simon Willison's OpenAI WebRTC Playground Adds Document Context to Realtime Voice
Willison updated his open WebRTC audio playground (originally built Dec 2024) so you can paste a document before a session and have the model discuss it live over voice. It runs on OpenAI's GPT-Realtime-2 — the company's first realtime voice model with GPT-5-class reasoning (128K context, parallel tool calls, interruption handling), introduced in the May 7 voice-API wave. The takeaway for builders: realtime voice + grounding context is now a few-lines-of-config browser tool, lowering the bar for voice agents that reason over your own material.
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