> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> STT). Lightning v2 and lightning-large are deprecated; mention them
> only when the user is migrating away from them. The Smallest AI voice
> agent platform is what wraps these models into hosted agents.

# Pulse STT - streaming now supports ja / yue / zh / ko + `multi-asian` aggregator (US region)

> The Pulse streaming Speech-to-Text API now supports four Asian languages: Japanese (ja), Cantonese (yue), Mandarin (zh), and Korean (ko).

The Pulse streaming Speech-to-Text API now supports four Asian languages: Japanese (`ja`), Cantonese (`yue`), Mandarin (`zh`), and Korean (`ko`). The `multi-asian` aggregator is also available for unknown East Asian audio - it auto-detects across the same four-language set.

These five language values are served from the US region only - connect to `wss://api.us.smallest.ai/waves/v1/stt/live?model=pulse` (or the legacy `wss://api.us.smallest.ai/waves/v1/pulse/get_text`) instead of the default `wss://api.smallest.ai/...` host. Requesting any of them on the default (ap-south-1) host closes the connection without a transcription frame.

All other Pulse streaming parameters work as before: `punctuate`, `capitalize`, `numerals`, `word_timestamps`, `diarize`, `redact_pii`, `redact_pci`, sample rates 8000/16000/22050/24000/44100/48000, encodings `linear16` (default) / `linear32` / `alaw` / `mulaw` / `opus` / `ogg_opus`.

**Pre-recorded (batch) is unchanged.** Cantonese (`yue`) is not enabled on the batch endpoint at all; Japanese, Mandarin, and Korean behave separately from streaming and are not formally supported on batch - use the streaming endpoint for these four languages.

Example response frame:

```json
{
  "type": "transcription",
  "transcript": "讀書要從薄到厚再從厚到薄",
  "is_final": true,
  "is_last": false,
  "language": "zh"
}
```

→ [Pulse model card - Supported Languages](/model-cards/speech-to-text/pulse)
→ [Speech-to-Text overview](/models/speech-to-text/overview)