Multilingual
speech-to-text API
Real-time transcription with native-speaker accuracy across 60+ languages and mid-sentence code-switching. Built for voice agents, live meetings, and large-scale audio transcription.
$0.10/hour async · $0.12/hour real-time
Looking for TTS API?
Try Soniox Text-to-Speech
Trusted by teams building global voice products
Unmatched accuracy in 60+ languages
Native-speaker accuracy across languages, accents, mixed-language speech, names, numbers, and domain-specific terminology.
Native-speaker accuracy
Accurate speech recognition across 60+ languages, including accents, dialects, and real-world conversational speech.
“It just gets the words right, any language, any accent, any context. That’s what accuracy is supposed to look like.”
Tony Wang, Cofounder & Chief Revenue Officer at AgoraAutomatically detect and switch languages
Soniox identifies the language automatically and follows language changes as they happen, even within the same sentence.
Works in real-world audio
Soniox stays accurate across background noise, phone calls, accents, and everyday recording conditions.
Telephony audio
Transcript
Uh, Mariam, let me ask you: your phone, the one you said you’re using, Pixel phone, is it an Android?
Strong accent
Transcript
Among the poets, I remember William Wordsworth, T.S.
Background noise
Transcript
We’re here at Gene Autry in Wash, one of the usual suspects for high-wind gusts.
Get every character right
Names, phone numbers, addresses, IDs, serial numbers, and other structured information are recognized precisely.
Phone number
My number is +49 172 684 9317.
Reference ID
The case number is AX-4927-B.
Mixed alphanumeric
The device serial number is XR8Q-19F2.
International name
Nguyễn Minh Anh will join the meeting at three.
“As Germany’s leading voicebot provider for automotive dealerships, Soniox has transformed our recognition of customer IDs and alphanumerics, driving much higher voicebot acceptance rates.”
Dr. Steven Zielke, Founder & CEO of mobilAppImprove accuracy with context
Provide terminology, names, custom vocabulary, or other context to guide recognition toward the right words.
Good morning, Mrs.Valetti. SinceCalypta didn't reduce your migraine days, we'll startVieppti infusions every 12 weeks, and review how you respond at your next visit.
Good morning, Mrs.Faletti. SinceQulipta didn't reduce your migraine days, we'll startVyepti infusions every 12 weeks, and review how you respond at your next visit.
“Soniox captures complex medical terminology with high accuracy, helping physicians finalize notes faster and focus on patient care.”
Max Malyk, Vice President at DeliverHealthBuilt for real-time conversation
Ultra-low-latency streaming, intelligent endpoint detection, and real-time speaker diarization for natural, responsive conversations. Pair with Soniox Text-to-Speech real-time voice generation API to build a complete end-to-end voice pipeline.
See words appear in real-time
Receive transcription continuously while someone is speaking.
Know when the speaker is finished
Soniox detects when a speaker has actually completed their thought, not just when they pause.
“Soniox knows who’s speaking and when each thought ends. The real-time transcripts read like true dialogue, not data dumps.”
Adam Strom, Co-Founder & President at Mobius MDKnow who said what
Soniox separates speakers in real time, so every word stays connected to the person who said it.
“We tried a dozen speech-to-text and translation services. Soniox is the best, so that's what we use.”
Cayden Pierce, CEO/CTO at MentraBuilt for live and recorded audio
Choose real-time transcription for live speech or asynchronous transcription for recorded audio at scale.
Soniox STT v5 Real-time
Transcribe speech continuously as it happens with ultra-low latency for voice agents, live conversations, captions, and other interactive applications.
Soniox STT v5 Async
Process recorded audio and files with high accuracy and fast throughput for meetings, calls, media, archives, and large-scale transcription.
Speech infrastructure for massive scale
Build on one API and deploy in your region
Use the same models and API everywhere, with in-region processing to meet latency, data residency, and regulatory requirements.
Available: US, EU, Japan, India
Coming soon: Korea, Australia, Canada, Saudi Arabia, UK, Brazil
Run mission-critical systems with confidence
- 99.9% uptime
Production-hardened infrastructure with monitoring and redundancy. - low-latency streaming
Process speech in real time with low latency for responsive voice applications. - Priority support
Severity-based incident response with direct access to the Soniox team.
"Before Soniox, our international users always had a noticeably different experience. Now accuracy and responsiveness match across all regions…it feels like one system instead of five."
Alon Yair CTO of Onvego
Use cases
Soniox is built for developers and teams who need accurate, real-time speech understanding at scale.
Voice agents
Build responsive voice agents with low-latency transcription, accurate turn detection, and reliable speech recognition across 60+ languages.
AI notetaking
Turn meetings, conversations, and free-form dictation into accurate, structured text with speaker separation and real-time transcription.
Medical transcription
Capture clinical conversations and dictation accurately, including specialized medical terminology, multilingual speech, and speaker context.
Wearables
Power smart glasses, earbuds, watches, and other wearables with real-time transcription, translation, captions, and hands-free voice interaction.
Call centers (CX / IVR)
Understand customer calls in real time with accurate transcription, speaker separation, multilingual support, and structured data for agent assist and automation.
Voice dictation
Turn natural speech into text users can use immediately, with low-latency streaming, context-aware recognition, and reliable handling of names and details.
Estimate your speech-to-text API cost
Choose real-time or async transcription and set your monthly audio volume to estimate your Soniox API cost.
Pricing calculator
Stop overpaying for speech AI
1,000 hours of audio / month
Pricing assumptions
Based on public pay-as-you-go pricing. Enterprise discounts and committed-use contracts may differ. Some providers charge separately for certain features. The calculator uses the public price for the provider configuration that most closely matches Soniox.
Use Soniox in popular frameworks
Soniox integrates seamlessly with leading real-time communication platforms, AI frameworks, automation tools, and developer SDKs.
An open source framework and developer platform for building, testing, deploying, scaling, and observing agents in production.
Twilio is a cloud-based customer engagement platform (CPaaS) that provides APIs, allowing developers to integrate voice, messaging (SMS, WhatsApp), email, and authentication capabilities into applications.
Open-source development framework designed to build applications powered by large language models (LLMs).
The open-source AI toolkit designed to help developers build AI-powered applications and agents with React, Next.js, Vue, Svelte, Node.js, and more.
Open-source AI SDK with a unified interface across multiple providers. No vendor lock-in, no proprietary formats.
n8n is a powerful, low-code/pro-code workflow automation tool that connects various applications, APIs, and databases to automate tasks.
Build the next generation of voice products, from agents and wearables to dictation, translation, and real-time multilingual experiences.
Compare Soniox side by side
Compare Soniox side by side with other providers across speech-to-text and text-to-speech. Live inputs. Transparent results.
Soniox
stt-rt-v5
No output yet...
OpenAI
gpt-realtime-whisper
No output yet...
Deepgram
Nova-3 Multilingual Streaming
No output yet...
Go global with one API
Get production-ready speech-to-text in 60+ languages.
Privacy and compliance, built right in
Never stored, never saved.
Audio stays in memory, everything is processed in real-time.
Built for privacy-critical use cases.
Adhering to leading global security, privacy, and compliance standards.
Trusted where privacy matters most.
Used in industries where speech is sensitive, from healthcare to enterprise.
Frequently asked questions
Which languages does the Soniox API support?
How much does the Soniox speech-to-text API cost?
Which SDKs and integrations can I use?
Which speech-to-text models are available?
stt-rt-v5 for real-time streaming and stt-async-v5 for recorded files. Both use a single, unified model for every supported language, so you never load, manage, or switch models for multilingual or mixed-language speech. See models.How does Soniox compare to Whisper and other APIs?
Is the Soniox API suitable for real-time and low-latency applications?
Can the Soniox API transcribe and translate speech at the same time?
Can Soniox handle language switching mid-sentence?
How does Soniox perform with noisy or real-world audio?
Can Soniox distinguish between different speakers?
Can I customize accuracy for my domain or use case?
Where is speech data processed, and is it used for training?
Is the Soniox API suitable for production and enterprise use?
- Scalable, production-hardened infrastructure
- Priority support with severity-based incident response
- Identical models and APIs across regions
How do I get started?
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Explore docsSee what you’ll pay
Pay only for what you use with our flexible pricing. Built to scale with you.
Pricing details