MLE-5017: docs: add VAD/turn_detection params to realtime transcription endpoint

[rishabh-bhargava]

Summary

Documents the Voice Activity Detection (VAD) configuration for the /realtime WebSocket transcription endpoint. This was previously completely undocumented despite being actively used by customers.

What's added

New client event:

• transcription_session.updated — configure VAD parameters or disable VAD entirely

VAD parameters table (5 client-settable params with production defaults):

• threshold (default 0.3)
• min_silence_duration_ms (default 500)
• min_speech_duration_ms (default 250)
• max_speech_duration_s (default 5.0)
• speech_pad_ms (default 250)

VAD disable/enable:

• turn_detection: null in session message to disable
• turn_detection=none query parameter to disable at connection time
• Documents behavior difference: VAD on = auto completed events; VAD off = manual commit required

New server event:

• transcription_session.updated — confirms VAD config was applied

Query parameter support:

• Documents that all VAD params can be set as URL query parameters at connection time

Defaults verified against

Production defaults from inference-pop/src/v1/realtime.ts (lines 403-414), NOT the vad-service Python fallbacks which differ.

🤖 Generated with Claude Code

[github-actions]

✱ Stainless preview builds

This PR will update the togetherai SDKs with the following commit messages.

go

chore(internal): regenerate SDK with no functional changes

openapi

docs: add VAD parameters and session update events to transcription WebSocket

python

chore(internal): regenerate SDK with no functional changes

terraform

chore(internal): regenerate SDK with no functional changes

typescript

chore(internal): regenerate SDK with no functional changes

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Last updated: 2026-04-17 23:23:05 UTC