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Japanese to Thai speech translation API

Stream Japanese (日本語) speech and get Thai (ภาษาไทย) back in real time. One WebSocket, ISO codes ja to th, and ultra-low latency for voice agents and live apps.

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Production-ready Japanese to Thai translation API

Real Japanese speech includes accents, regional dialects, code switching, and domain-specific vocabulary. Soniox recognizes it in a single model and streams Thai while the speaker is still talking.

Japanese (Japonic) and Thai (Kra-Dai > Tai) come from different language families, so word order and morphology differ. Soniox reorders meaning in-stream instead of word by word.

Japanese is written in CJK and Thai in Thai, so Soniox emits correctly scripted Thai text.

A breakthrough in real-time Japanese to Thai translation

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Translate before the sentence ends

Thai meaning lands as Japanese is spoken, not after the caption catches up.

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Directional ja to th streaming

Set the source and target codes once. Both arrive in a single labeled token stream.

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High quality Thai output

Same model across every language, including historically underserved ones.

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Native-speaker Japanese STT accuracy

Accurate Thai translation starts with accurate Japanese recognition across accents and language switching.

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Names, numbers, and domain terms

Preserved across the pair, including phone numbers, emails, and IDs.

config.json
{
  "model": "stt-rt-v4",
  "translation": {
    "type": "one_way",
    "source_language": "ja",
    "target_language": "th"
  }
}

Japanese and Thai through a single stream

Japanese to Thai translation is built on top of Soniox Speech-to-Text API. Every spoken word is transcribed, and Thai translation streams mid-sentence in the same labeled token stream.

Turn it on by adding a translation block with source_language: "ja" and target_language: "th". It runs on the same WebSocket and the same model, with no extra round trip.

Live Japanese to Thai: written and spoken

Japanese to Thai speech-to-text

micLive Japanese speecharrow_right_altsubjectThai text

Translate live Japanese into written Thai with the Soniox STT API. Soniox streams the Japanese transcript and the Thai translation as speech happens.

Use it for Thai captions, subtitles, meeting translation, agent assist, and multilingual transcription.

Japanese to Thai speech-to-speech

micLive Japanese speecharrow_right_altvolume_upSpoken Thai

Build full spoken Japanese to Thai translation by combining Soniox STT and Soniox TTS. Soniox recognizes Japanese, translates it, and speaks Thai with low latency.

Use it for live interpreters, bilingual voice agents, travel assistants, and customer support.

Live Japanese to Thai translation in action

Stream Japanese to Thai one-way to push all speech into Thai, or two-way to keep a bilingual conversation flowing between the two languages.

voice_selection
Japanese speaker says: “Slackで9:30にrescheduleって送っておくね。”
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Translated into Thai in real time.

One-way translation

Translate live Japanese into Thai. Everyone in the conversation sees the same translated stream.

Ideal for live captions, multilingual meetings, broadcasts, lectures, and customer calls.

voice_selection
Japanese speaker talks in Japanese.
hearing
Thai speaker hears Thai.
voice_selection
Thai speaker replies in Thai.
hearing
Japanese speaker hears Japanese.

Two-way translation

Translate between Japanese and Thai for live bilingual conversation. Each side speaks naturally and hears the other in their own language.

Soniox supports real-time two-way translation between any two of 60+ supported languages.

Accurate on both ends of the pair

Soniox transcribes Japanese at 8.7% word error rate and Thai at 9.5% word error rate. Accurate recognition on both sides is what makes the translation reliable.

speech_to_text

Speech-to-Text

Native-speaker accuracy across 60+ languages, with support for multilingual speech, alphanumerics, speaker diarization, context.

translate

Translation

Real-time streaming translation across 3,600 language pairs, built for high quality and low delay across all supported languages.

text_to_speech

Text-to-speech

High-fidelity speech generation in 60+ languages, built for names, alphanumerics, language switching, and ultra-low-latency streaming.

Together, they create a complete real-time low-latency speech AI platform.

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About Japanese and Thai

Japanese has roughly 125,000,000 speakers across Japan. Thai has roughly 70,000,000 speakers across Thailand, Laos, Myanmar, and Cambodia.

Japanese uses three writing systems simultaneously: kanji (Chinese characters), hiragana, and katakana.

The Thai script was created in 1283 by King Ramkhamhaeng the Great, adapted from Khmer script.

Soniox makes Japanese to Thai usable in real-time translation across every supported pair.

Translate Japanese to any language

From Japanese to Thai, or Japanese to any of 60+ supported languages. All real-time.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Related translation pages

swap_horizTranslate Thai to Japanesearrow_right_alttranslateJapanese speech translationarrow_right_alttranslateThai speech translationarrow_right_alt

Frequently asked questions

How do I translate Japanese to Thai with the API?arrow_downward
Add a translation block to your real-time request with source_language "ja" and target_language "th". Soniox transcribes Japanese and streams the Thai translation over the same WebSocket.
Is Japanese to Thai translation real-time?arrow_downward
Yes. Soniox streams Thai while Japanese is still being spoken, so meaning arrives mid-sentence instead of after the sentence ends.
What about translating Thai to Japanese?arrow_downward
That direction is supported too. See the Thai to Japanese page, or use two-way translation to run both directions in one session.
Does Soniox handle CJK to Thai output?arrow_downward
Yes. Soniox outputs correctly scripted Thai text in Thai directly in the token stream.
Does Soniox handle Japanese dialects and accents?arrow_downward
Yes. Soniox handles Japanese dialects like Kanto, Kansai, and Tohoku in a single model, so Thai translation stays accurate across regions.
Which other providers support Japanese to Thai?arrow_downward
Based on their public docs, OpenAI and Azure list both Japanese and Thai for real-time translation. Soniox is the only one that also supports two-way live translation across 60+ languages.
How fast is Japanese to Thai translation?arrow_downward
Soniox streams Thai as Japanese is being spoken, with ultra-low latency. Translation arrives before the sentence ends.

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