Languages

The service passes the language value straight through to the upstream STT endpoint. Use the language code expected by the upstream model.

Common examples:

zh — Chinese

en — English

auto — let the upstream auto-detect the language

Real-time, [segment](/docs/api-reference/segment-transcription), and [batch jobs](/docs/api-reference/batch-jobs) all accept a language field. In the realtime gateway, update the language at any time with a session.update message.

Model and capability identifiers

model — offline STT model override (default whisper-large-v3-turbo)

sttModel / stt_model — realtime STT model selection

normalizerModel / normalizer_model — text normalizer model selection

backend — upstream backend selection

Not all model fields are forwarded by the gateway; see [Session Configuration](/docs/realtime/session-configuration) for the current whitelist.

Specific identifier values depend on the upstream provider and are not contractually fixed by this gateway.

See also

[Live Translation](/docs/concepts/live-translation) — source language, target language, auto-detection, and code-switching

[Segment Transcription](/docs/api-reference/segment-transcription) — sync multipart parameters

[Batch Jobs](/docs/api-reference/batch-jobs) — async audio_url parameters

[Session Configuration](/docs/realtime/session-configuration) — realtime session.update fields