New: Soniox v5 Async is here
Get the AppBuild with API

Korean speech-to-text API for AI voice agents

Build with API Explore docs

Trusted by

Why Soniox is the best speech-to-text API for Korean AI voice agents

“Best” for Korean voice agents isn’t just about top benchmark scores on clean audio, it’s about predictable, reliable behavior in real production systems.

To serve a potential market of over 81,700,000 Korean speakers across South Korea, North Korea, United States, and beyond, Korean AI voice agents requires a deep understanding of regional accents and a predictable behavior in live production.

A speech-to-text system for Korean voice agents should:

  • Deliver highly accurate transcription that keeps up with live Korean conversations.
  • Run with ultra-low latency, enabling real-time LLM processing and fast responses.
  • Reliably detect end-of-turn speech so agents respond at the right moment.
  • Perform in real-world conditions with noise, accents, interruptions, and multilingual speech.
  • Scale economically, with pricing that works for high-volume deployments.

Soniox is built around these requirements from the ground up, delivering fast, reliable speech recognition for voice agents for Korean and all other 60+ supported languages. One unified model supports true multilingual and language-switching speech, without changing configurations, switching models, or restarting streams.

With real-time Korean language transcription starting at ~$0.12 per hour, Soniox makes it practical and cost-effective to deploy Korean voice agents at massive scale, anywhere.

“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 mobilApp

Lowest-latency Korean speech-to-text in practice

Live Korean transcription

Soniox is built for continuous conversational streams, returning Korean text as speech arrives so agents can act before the speaker is done.

Learn about Korean real-time transcription

Endpoint detection for Korean

Built-in endpoint detection gives Korean voice agents reliable end-of-turn signals without fragile silence timers.

Understand endpoint detection

Custom context for Korean

Inject brand names, jargon, and regional terms at request time to improve Korean accuracy without fine-tuned models.

Read more about context customization

Korean plus 60+ more languages

One model handles Korean and in-stream language switching, keeping latency stable and multilingual deployments simple.

See supported languages list

Data residency for regulated deployments

Keep Korean speech and transcripts in the required geography for regulated deployments.

Get more details about data residency

Why it works

Voice agents need speech recognition that is fast, predictable, multilingual, and production-ready.

Soniox combines low-latency streaming, turn detection, context control, Korean accuracy, and regional deployment in one real-time API.

Start building with Soniox API

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.

Open source framework for voice and multimodal conversational AI.

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.

Korean voice agents for every use case

Smart assistants in Korean

Deliver fast, natural voice interactions in Korean to help answer questions or complete tasks in speaker's native language.

Customer support

Support agents can instantly handle Korean-speaking customers without any model switching, resolving issues much faster.

In-app voice agents

Add natural Korean voice automation directly into your app – from onboarding to scheduling to self service – with fast, structured responses.

Call routing agents

Identify intent early and respond immediately, even before the user finishes speaking. No phone menus necessary.

Build with API

Simple, usage-based pricing

Start transcribing live audio streams from ~$0.12/hour and async (files) from ~$0.10/hour.

View pricing

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.

Soniox is Soc 2 Type 2 compliant
Soniox is ISO 27001:2022 compliant
Soniox is HIPAA compliant
Soniox is GDPR compliant
SOC 2 Type 2 · ISO/IEC 27001:2022 · HIPAA · GDPR

Power up your Korean AI voice agent

Production-ready speech recognition for Korean and 60+ other languages.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Frequently asked questions about Soniox Speech-to-Text API for Korean AI voice agents

What is the Soniox Speech-to-Text API for Korean?
Soniox provides a real-time Korean speech-to-text API designed for AI voice agents. It converts live Korean speech into text with low latency, supports streaming use cases, and works alongside more than 60 other languages without switching models or restarting the stream.
Is Soniox suitable for building Korean AI voice agents?
Yes. Soniox's multilingual AI speech models can easily handle real-time Korean voice agent workflows, including streaming transcription, early token delivery, and endpoint detection for conversational turn-taking, all configurable through the API.
What makes Soniox a low-latency Korean speech-to-text API?
Soniox uses a real-time streaming architecture that processes Korean audio continuously and emits transcription results incrementally as speech arrives. This allows voice agents to begin processing Korean speech before an utterance is complete.
How does Soniox detect when Korean-speaking users finish talking?
Soniox includes built-in endpoint detection that identifies speech boundaries in Korean. Voice agents can use emitted end events to decide when to respond without relying on client-side silence timers.
Can I customize transcription behavior for Korean voice agents?
Yes. The Soniox API is configurable, allowing developers to adjust transcription behavior for Korean speech, including custom context for domain-specific vocabulary, eliminating the need for separate fine-tuned models.
Can Soniox handle language switching involving Korean within a conversation?
Yes. Soniox can recognize and transcribe speech when speakers switch between Korean and other supported languages mid-sentence or mid-conversation, without requiring stream restarts or language-specific routing.
Is Soniox suitable for regulated industries using Korean speech?
Yes. Soniox supports data residency for regulated environments such as medical and legal use cases, allowing Korean speech and transcript data to remain within required geographic regions while using the same real-time API.
Is Korean audio stored when using the Soniox API?
No. Korean audio is processed in real-time and kept in memory only. Soniox is designed for privacy-critical voice agent applications where speech data should not be stored by default.
How do developers get started with Korean speech-to-text in Soniox?
Developers can generate an API key on Soniox Console and start streaming Korean audio over WebSockets to Soniox immediately. The API integrates with common voice agent frameworks and real-time media pipelines.