Build agents and applications that understand speech in any language

Name: Soniox API
Brand: Soniox Inc

The world’s most accurate real-time speech-to-text and translation API, powering voice agents, live systems, and applications across 60+ languages.

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“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 Agora

Recognize speech with speaker-native accuracy across 60+ languages

Unlike providers that only perform well in English, Soniox captures every word precisely, with proven lowest error rates, across 60+ languages – including dialects, accents, and mixed phrases.

"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 Mentra

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View language identification docs

Handle language switching mid-sentence

In the real world, people often mix languages within a sentence or phrase. A user might say “오늘 delivery status 알려주세요”, mixing Korean and English. Soniox keeps up, instantly detecting language changes and transcribing every word in the correct language.

"It’s the first model we’ve used that actually understands Hinglish. Switching mid-sentence just works."

Prakash N,
Co-Founder & Director at Tevatel

Capture alphanumerics like emails, addresses, and phone numbers

From phone numbers to reference IDs, Soniox recognizes alphanumerics exactly as spoken in any language. Real-time precision down to the very last digit and character.

"As the leading provider of voicebots for automotive dealerships in Germany, we’ve faced significant challenges recognizing license plates accurately. Soniox has solved this problem with exceptional recognition of alphanumeric sequences, resulting in a much higher acceptance rate for our voicebot."

Dr. Steven Zielke,
Founder & CEO of mobilApp

View endpoint detection docs

Detect when a speaker has finished speaking

Soniox goes beyond basic timing and silence detection — using advanced endpoint detection that reads tone, meaning, and conversational flow to know when someone is truly finished speaking. The result: smoother, faster, and more natural responses.

"It’s so fast, captions appear before people even finish talking. Zero lag. No buffering. Nothing."

Dag-Inge Aas,
Head of AI at Tana

Separate and identify speakers across 60+ languages

Soniox identifies and separates speakers in real-time across 60+ languages, ensuring transcripts always capture who said what. Conversations stay organized, searchable, and clear, even when voices overlap or switch rapidly.

"Live multilingual meetings finally sound natural, Soniox translates fluidly, in real-time."

VP of engineering at leading AI assistant company

View speaker diarization docs

View context docs

Improve accuracy with domain-specific context

Soniox instantly adapts to your use case whether it’s healthcare, law, finance, or media – with just a few simple details like domain, topic, or participant names. These pointers guide the AI to use the right terminology, phrasing, and context for your field.

"Soniox's ability to accurately transcribe complex medical terminology means our physician-customers spend significantly less time editing. This allows them to finalize their notes faster and focus on what matters most: patient care."

Max Malyk,
Vice President at DeliverHealth

Translate speech as people speak, not after they finish

3,600 language pairs supported.

Soniox delivers the world’s first true real-time, any-to-any speech translation – translating as people speak, not after they finish. Unlike other systems that wait for full sentences or support only one-way pairs, Soniox streams mid-sentence translations continuously between 60+ languages, in every possible combination. The result is low-latency, high-quality translation that sounds natural and immediate.

"It just gets the context — and when we add our own domain knowledge, it feels completely customized to us."

Mark Boyce,
CEO at MediLogix

View real-time translation docs

Speech infrastructure for massive scale

View data residency docs

Build on one API and deploy in your region

Soniox processes and stores speech data entirely within your selected region, using the same models and APIs everywhere. This ensures data residency, regulatory compliance, and low-latency performance for local users.

Available: US, EU, Japan
Coming soon: Korea, Australia, Canada, India, Saudi Arabia, UK, Brazil

"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 at Onvego

Run mission-critical systems with confidence

Built for real-time speech applications where reliability, latency, and support matter.

99.9% uptime
Production-hardened infrastructure with monitoring and redundancy.
Sub-200ms real-time latency
Stream speech as it’s spoken — no waiting for sentence boundaries.
Priority support
Severity-based incident response with direct access to the Soniox team.

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Use Soniox in popular frameworks

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.

SOC 2 Type II–certified and HIPAA-ready from day one.

Trusted where privacy matters most.

Used in industries where speech is sensitive — from healthcare to enterprise.

SOC 2 Type 2 compliant

HIPAA compliant

GDPR compliant

See how Soniox compares

Test Soniox side by side with Google, OpenAI, Azure, and more. Same audio. Same conditions. Live, transparent results.

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Go global with one API

Get production-ready speech-to-text recognition, transcription, and translation in 60+ languages.

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Create your account and generate an API key to get started instantly.

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Frequently asked questions

Which languages does the Soniox API support?arrow_downward

The Soniox API supports 60+ languages for real-time speech-to-text and translation. This includes major global languages and many regional languages, with native-speaker accuracy across accents and dialects.

Does Soniox require switching between models for different languages?arrow_downward

No. Soniox uses a single, unified model architecture that works across all supported languages. You don’t need to load, manage, or switch models when handling multilingual or mixed-language speech.

Can the Soniox API transcribe and translate speech at the same time?arrow_downward

Yes. Soniox can transcribe speech and produce translations in real time, as the speaker is talking — without waiting for sentence boundaries or pauses.

Can Soniox handle language switching mid-sentence?arrow_downward

Yes. Soniox can accurately recognize and processmixed-language speech, including cases where speakers switch languages mid-sentence or mid-conversation, without manual configuration.

Is the Soniox API suitable for real-time and low-latency applications?arrow_downward

Absolutely. Soniox is designed for live, streaming use cases, delivering sub-200ms latency and word-by-word output suitable for voice agents, live meetings, call centers, and interactive systems.

Is the Soniox API suitable for production and enterprise use?arrow_downward

Yes. Soniox is built for mission-critical production systems, offering:

- 99.9% uptime
- Scalable, production-hardened infrastructure
- Priority support with severity-based incident response
- Identical models and APIs across regions

How does Soniox perform with noisy or real-world audio?arrow_downward

Soniox is optimized for real-world speech, including background noise, overlapping speakers, accents, and imperfect microphones. It performs reliably in meetings, calls, and everyday environments — not just clean studio audio.

Can Soniox distinguish between different speakers?arrow_downward

Yes. Soniox supports speaker detection, allowing transcripts to clearly separate who said what in multi-speaker conversations.

How does Soniox handle privacy and data security?arrow_downward

Speech data is processed and stored entirely within your selected region, supporting data residency and regulatory requirements. Soniox is designed with privacy, security, and enterprise compliance in mind.

Can I customize accuracy for my domain or use case?arrow_downward

Yes. Soniox supports domain-specific context and customization, improving accuracy for names, terminology, numbers, and specialized vocabulary relevant to your application.

How hard is it to integrate the Soniox API?arrow_downward

Integration is straightforward. Soniox provides clear documentation, real-time streaming APIs, and production-ready SDKs, allowing most teams to get a working prototype running quickly.

How do I get started?arrow_downward

You can explore the API documentation to start building immediately, or contact Soniox for production and enterprise deployments.

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