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stt-rt-v4

soniox/stt-rt-v4

Soniox v4 Real-Time, released February 5, 2026, which cut endpoint and finalization latency, improved semantic endpointing for turn-taking and added max_endpoint_delay_ms. Replaced by stt-rt-v5; since June 30, 2026 requests to this id are served by v5.

Get API KeyRead the Docs
API
curl "$AUDIOLAB_API_URL/v1/audio/transcriptions" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -F 'model=soniox/stt-rt-v4' \
  -F 'file=@recording.wav'
Read docs
Input Price
$0.0017 / minute
Output Price
—
Input
Audio
Output
Text

Capabilities

Explore what stt-rt-v4 supports, then use the API section for a request tailored to this model.

BatchStreamPricing estimated

Model Information

Provider
Soniox
Product
Speech-to-Text
Release Date
Feb 5, 2026
Data Policy
Not specified
Region
US
Input
Audio
Output
Text
Provider Documentation

Playground

Try stt-rt-v4 by Soniox. Requests use the selected workspace’s credits and API pricing.

stt-rt-v4Credits —
stt-rt-v4
Attach an audio file to turn speech into text.
Sign in to run a requestAPI reference

Providers

Compare available endpoints, pricing, and context limits for stt-rt-v4.

ProviderContextOutputInput PriceOutput PriceEndpoint
SonioxNot specifiedText$0.0017 / minute—
soniox/stt-rt-v4:soniox

Prices are catalog rates. Your workspace’s estimate and endpoint pricing determine the final charge.

Input and Output Limits

Formats and limits AudioLab enforces on each request.

LimitValue
Max seconds3600
Formatswav, mp3, flac, m4a, ogg, webm

Performance

Status

Current catalog availability. Your workspace’s access is checked separately before a request runs.

Getting Started

Use your workspace API key and the exact model identifier below. Set the API URL to the endpoint shown in your workspace and keep credentials on your server.

API
curl "$AUDIOLAB_API_URL/v1/audio/transcriptions" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -F 'model=soniox/stt-rt-v4' \
  -F 'file=@recording.wav'
Read docs
Read the Endpoint Reference

Request Parameters

Available parameters depend on the provider and request format. The endpoint reference explains accepted values and required fields.

ParameterDetails
modelsoniox/stt-rt-v4 — Required model identifier.

Input and Output Limits

Formats and limits AudioLab enforces on each request.

LimitValue
Max seconds3600
Formatswav, mp3, flac, m4a, ogg, webm

Similar Models

Explore more speech-to-text and compare their capabilities.

ModelContextInput PriceOutput Price
STT Realtime v5SonioxNot specified$0.0017 / minute—
STT Async v5SonioxNot specified$0.0014 / minute—
stt-async-v4SonioxNot specified$0.0014 / minute—
stt-async-v3SonioxNot specified$0.0014 / minute—
stt-rt-v3SonioxNot specified$0.0017 / minute—
stt-rt-preview-v2SonioxNot specified$0.0017 / minute—
View All Speech-to-Text