Soniox

by Soniox

Real-time multilingual ASR API with low-latency streaming and code-switching support.

TL;DR

Real-time multilingual ASR API with low-latency streaming and code-switching support.

Best for voice agents and call-center products that need low-latency real-time multilingual STT. Pricing: per-minute (see Soniox pricing page).

What it is

Soniox is an independent speech-recognition API vendor focused on real-time streaming. Notable for code-switched multilingual recognition (multiple languages in one utterance), speaker diarization, custom vocabulary, and low end-to-end latency that targets agent-assist and live captioning. Available via WebSocket and REST. Pricing is per-minute with volume tiers; HIPAA-eligibility and enterprise terms via direct contract. Best fit: voice agents and call-center products that need low-latency real-time multilingual stt. Caveats: smaller vendor than hyperscalers; slas and roadmap depend on direct sales contact. Pricing as listed: per-minute (see Soniox pricing page). Feature flags from vendor docs: speaker diarization, word-level timestamps, streaming. Directory tags: commercial-api. Last vendor-page check: 2026-05-12.

Best for: Voice agents and call-center products that need low-latency real-time multilingual STT.
Watch out for: Smaller vendor than hyperscalers; SLAs and roadmap depend on direct sales contact.

Install / use

Soniox WebSocket: wss://api.soniox.com/transcribe-websocket

Features

Speaker diarization	Yes
Word-level timestamps	Yes
Streaming / real-time	Yes
Languages supported	None
HIPAA eligible	No

Soniox vs Whipscribe

Feature	Soniox	Whipscribe
Category	Transcription APIs	Transcription APIs
Pricing	per-minute (see Soniox pricing page)	free beta
Speaker diarization	Yes	Yes
Word timestamps	Yes	Yes
Streaming	Yes	No
Languages	—	99
Platforms	API	Web, API, MCP

Alternatives to Soniox

OpenAI Whisper API

OpenAI

Hosted Whisper large-v3 from OpenAI — $0.006 per minute.

$0.006/min

AssemblyAI

Universal-2 model + diarization, PII redaction, topic detection, summarization.

from $0.37/hr

Deepgram

Nova-2 model, excellent streaming, strong at conversational audio.

from $0.0043/min

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