Realtime Transcription Session Turn Detection

• RealtimeTranscriptionSessionTurnDetection object \{ prefix_padding_ms, silence_duration_ms, threshold, type \}

  Configuration for turn detection. Can be set to null to turn off. Server VAD means that the model will detect the start and end of speech based on audio volume and respond at the end of user speech. For gpt-realtime-whisper, this must be null; VAD is not supported.

  • prefix_padding_ms: optional number

    Amount of audio to include before the VAD detected speech (in milliseconds). Defaults to 300ms.

  • silence_duration_ms: optional number

    Duration of silence to detect speech stop (in milliseconds). Defaults to 500ms. With shorter values the model will respond more quickly, but may jump in on short pauses from the user.

  • threshold: optional number

    Activation threshold for VAD (0.0 to 1.0), this defaults to 0.5. A higher threshold will require louder audio to activate the model, and thus might perform better in noisy environments.

  • type: optional string

    Type of turn detection, only server_vad is currently supported.