Soniox STT

SonioxSTT streams PCM audio to the Soniox real-time transcribe WebSocket (wss://stt-rt.soniox.com/transcribe-websocket). Uses the ws package — no vendor SDK required. The adapter accumulates is_final tokens into segments and flushes them when an <end> / <fin> endpoint token is received.

Install

npm install getpatter

Usage

Use the namespaced import (getpatter/stt/soniox) or the flat re-export (SonioxSTT). Both auto-resolve SONIOX_API_KEY from the environment when apiKey is omitted.

// Namespaced import
import * as soniox from "getpatter/stt/soniox";

const stt = new soniox.STT();                                    // reads SONIOX_API_KEY
const stt2 = new soniox.STT({ apiKey: "...", languageHints: ["en", "it"] });

// Flat alias (equivalent)
import { SonioxSTT } from "getpatter";

const stt3 = new SonioxSTT();

# See python-sdk/providers/soniox for the Python twin.

Plug it into an agent:

// npx tsx example.ts
import { Patter, Twilio, SonioxSTT, ElevenLabsTTS } from "getpatter";

const phone = new Patter({ carrier: new Twilio(), phoneNumber: "+15550001234" });

const agent = phone.agent({
  stt: new SonioxSTT({ languageHints: ["en"] }),      // SONIOX_API_KEY from env
  tts: new ElevenLabsTTS({ voiceId: "rachel" }),
  systemPrompt: "You are a helpful assistant.",
});

await phone.serve({ agent });

Models and rates

Soniox bills per minute of streamed audio. Default rate from getpatter/pricing:

Model	Rate / min
`stt-rt-v4` (default)	$0.002
`stt-rt-v3`	$0.002
`stt-rt-v2`	$0.002

($0.12/hr = $0.002/min. Override via new Patter({ pricing: { soniox: { price: ... } } }).)

Languages

Soniox real-time uses language hints rather than a single language code — pass a list of BCP-47 codes that the engine considers when scoring tokens:

const stt = new SonioxSTT({ languageHints: ["en", "es", "it"] });
const strict = new SonioxSTT({ languageHints: ["en"], languageHintsStrict: true });

enableLanguageIdentification: true (default) attaches a language code to each token. Real-time STT v4 supports 60+ languages — see the Soniox language matrix.

Options

Option	Default	Notes
`apiKey`	—	Reads from `SONIOX_API_KEY` when omitted.
`model`	`"stt-rt-v4"`	`"stt-rt-v4"`, `"stt-rt-v3"`, `"stt-rt-v2"`.
`languageHints`	—	BCP-47 code list.
`languageHintsStrict`	`false`	Restrict to the supplied hints only.
`sampleRate`	`16000`	8000, 16000, 24000 Hz.
`numChannels`	`1`	Mono only for telephony.
`enableSpeakerDiarization`	`false`	Server-side speaker IDs.
`enableLanguageIdentification`	`true`	Per-token language codes.
`maxEndpointDelayMs`	`500`	Silence (ms) before endpoint, range `[500, 3000]`.
`clientReferenceId`	—	Optional correlation ID surfaced in Soniox dashboards.
`baseUrl`	Soniox WS endpoint	Override for proxying.

Get Started

Setting up Patter

Observability

Integrations

Development

Soniox STT

Soniox STT

Install

Usage

Models and rates

Languages

Options

​Soniox STT

​Install

​Usage

​Models and rates

​Languages

​Options

Soniox STT

Install

Usage

Models and rates

Languages

Options