Why it matters

Realtime API enables voice agents. Understanding shapes multimodal.

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The architecture

WebSocket / WebRTC transport.

Bidirectional audio + text streams.

Low-latency turn-taking.

Function calling supported.

OpenAI Realtime APIWebSocket / WebRTCtransportBidirectional streamsaudio + textTurn-takinglow-latency dialogueVoice agent apps + interactive tutoring + accessibility use cases
OpenAI Realtime.
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How it works end to end

WebRTC for lowest latency.

Server VAD (voice activity detection).

Interruption handling.

Function calling in dialogue.