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Speech is multilingual: the model reads the input text in whatever language it is written, and you do not need to declare it. For cloned voices, match the language of the input text and reference audio when possible. To generate speech with a particular accent, such as British English, use a reference clip with that accent.

Language codes

The optional language field tells text normalization how to read out numbers, dates, currency, and abbreviations. When it is unset, normalization detects the language from the text. Set it when you know the language for the most reliable results.
  • Use ISO 639-3, three letters. eng, jpn, pol, rus, and cmn are valid; two-letter ISO 639-1 codes such as en, ja, or zh are not and return 400 invalid_field_value. Letter case doesnโ€™t matter. A few alternative ISO 639-3 codes are also accepted, such as zho for Chinese and arb for Arabic.
  • Leave it unset when unsure. A valid but wrong code is accepted, and numbers and dates are then normalized as the wrong language.
  • The same codes work everywhere. language on POST /v1/audio/speech and in the speech WebSocket start event takes the same values.
Codes for commonly requested languages: For any other language, use its ISO 639-3 code as listed in the ISO 639-3 registry.

Supported languages

Coverage is measured by word or character error rate (WER/CER) โ€” lower is better. Languages are grouped by quality tier and ordered alphabetically within each tier.

WER/CER under 5

Polished, production-quality output (85 languages). ๐Ÿ‡ฟ๐Ÿ‡ฆ Afrikaans ยท ๐Ÿ‡ธ๐Ÿ‡ฆ๐Ÿ‡ช๐Ÿ‡ฌ Arabic ยท ๐Ÿ‡ฆ๐Ÿ‡ฒ Armenian ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Assamese ยท ๐Ÿ‡ช๐Ÿ‡ธ Asturian ยท ๐Ÿ‡ฆ๐Ÿ‡ฟ Azerbaijani ยท ๐Ÿ‡ท๐Ÿ‡บ Bashkir ยท ๐Ÿ‡ช๐Ÿ‡ธ Basque ยท ๐Ÿ‡ง๐Ÿ‡พ Belarusian ยท ๐Ÿ‡ง๐Ÿ‡ฉ๐Ÿ‡ฎ๐Ÿ‡ณ Bengali ยท ๐Ÿ‡ง๐Ÿ‡ฆ Bosnian ยท ๐Ÿ‡ง๐Ÿ‡ฌ Bulgarian ยท ๐Ÿ‡ช๐Ÿ‡ธ Catalan ยท ๐Ÿ‡ต๐Ÿ‡ญ Cebuano ยท ๐Ÿ‡ฎ๐Ÿ‡ถ Central Kurdish ยท ๐Ÿ‡จ๐Ÿ‡ณ Chinese ยท ๐Ÿ‡ญ๐Ÿ‡ท Croatian ยท ๐Ÿ‡จ๐Ÿ‡ฟ Czech ยท ๐Ÿ‡ฉ๐Ÿ‡ฐ Danish ยท ๐Ÿ‡ณ๐Ÿ‡ฑ๐Ÿ‡ง๐Ÿ‡ช Dutch ยท ๐Ÿ‡ท๐Ÿ‡บ Eastern Mari ยท ๐Ÿ‡บ๐Ÿ‡ธ๐Ÿ‡ฌ๐Ÿ‡ง๐Ÿ‡ฆ๐Ÿ‡บ English ยท ๐ŸŒ Esperanto ยท ๐Ÿ‡ช๐Ÿ‡ช Estonian ยท ๐Ÿ‡ซ๐Ÿ‡ฎ Finnish ยท ๐Ÿ‡ซ๐Ÿ‡ท๐Ÿ‡จ๐Ÿ‡ฆ French ยท ๐Ÿ‡ช๐Ÿ‡ธ Galician ยท ๐Ÿ‡ฌ๐Ÿ‡ช Georgian ยท ๐Ÿ‡ฉ๐Ÿ‡ช๐Ÿ‡ฆ๐Ÿ‡น German ยท ๐Ÿ‡ฌ๐Ÿ‡ท Greek ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Gujarati ยท ๐Ÿ‡ญ๐Ÿ‡น Haitian Creole ยท ๐Ÿ‡ณ๐Ÿ‡ฌ Hausa ยท ๐Ÿ‡ฎ๐Ÿ‡ฑ Hebrew ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Hindi ยท ๐Ÿ‡ญ๐Ÿ‡บ Hungarian ยท ๐Ÿ‡ฎ๐Ÿ‡ฉ Indonesian ยท ๐Ÿ‡ฎ๐Ÿ‡น Italian ยท ๐Ÿ‡ฏ๐Ÿ‡ต Japanese ยท ๐Ÿ‡ฎ๐Ÿ‡ฉ Javanese ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Kannada ยท ๐Ÿ‡ฐ๐Ÿ‡ฟ Kazakh ยท ๐Ÿ‡ฐ๐Ÿ‡ท Korean ยท ๐Ÿ‡ท๐Ÿ‡ผ Kinyarwanda ยท ๐Ÿ‡ฐ๐Ÿ‡ฌ Kyrgyz ยท ๐Ÿ‡ฑ๐Ÿ‡ป Latvian ยท ๐Ÿ‡จ๐Ÿ‡ฉ Lingala ยท ๐Ÿ‡ฑ๐Ÿ‡น Lithuanian ยท ๐Ÿ‡ฐ๐Ÿ‡ช Luo ยท ๐Ÿ‡ฒ๐Ÿ‡ฐ Macedonian ยท ๐Ÿ‡ฒ๐Ÿ‡พ๐Ÿ‡ฎ๐Ÿ‡ฉ Malay ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Malayalam ยท ๐Ÿ‡ฒ๐Ÿ‡น Maltese ยท ๐Ÿ‡ณ๐Ÿ‡ฟ Mฤori ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Marathi ยท ๐Ÿ‡ฒ๐Ÿ‡ณ Mongolian ยท ๐Ÿ‡ณ๐Ÿ‡ต Nepali ยท ๐Ÿ‡ณ๐Ÿ‡ด Norwegian ยท ๐Ÿ‡ซ๐Ÿ‡ท Occitan ยท ๐Ÿ‡ฎ๐Ÿ‡ท๐Ÿ‡ฆ๐Ÿ‡ซ Persian ยท ๐Ÿ‡ต๐Ÿ‡ฑ Polish ยท ๐Ÿ‡ต๐Ÿ‡น๐Ÿ‡ง๐Ÿ‡ท Portuguese ยท ๐Ÿ‡ท๐Ÿ‡ด Romanian ยท ๐Ÿ‡ท๐Ÿ‡บ Russian ยท ๐Ÿ‡ฟ๐Ÿ‡ฆ Sepedi ยท ๐Ÿ‡ท๐Ÿ‡ธ Serbian ยท ๐Ÿ‡ฟ๐Ÿ‡ผ Shona ยท ๐Ÿ‡ธ๐Ÿ‡ฐ Slovak ยท ๐Ÿ‡ธ๐Ÿ‡ฎ Slovene ยท ๐Ÿ‡ช๐Ÿ‡ธ๐Ÿ‡ฒ๐Ÿ‡ฝ Spanish ยท ๐Ÿ‡น๐Ÿ‡ฟ๐Ÿ‡ฐ๐Ÿ‡ช Swahili ยท ๐Ÿ‡ธ๐Ÿ‡ช Swedish ยท ๐Ÿ‡ต๐Ÿ‡ญ Tagalog ยท ๐Ÿ‡น๐Ÿ‡ฏ Tajik ยท ๐Ÿ‡ฎ๐Ÿ‡ณ๐Ÿ‡ฑ๐Ÿ‡ฐ Tamil ยท ๐Ÿ‡ฎ๐Ÿ‡ณ Telugu ยท ๐Ÿ‡น๐Ÿ‡ญ Thai ยท ๐Ÿ‡น๐Ÿ‡ท Turkish ยท ๐Ÿ‡บ๐Ÿ‡ฆ Ukrainian ยท ๐Ÿ‡ต๐Ÿ‡ฐ๐Ÿ‡ฎ๐Ÿ‡ณ Urdu ยท ๐Ÿ‡จ๐Ÿ‡ณ Uyghur ยท ๐Ÿ‡บ๐Ÿ‡ฟ Uzbek ยท ๐Ÿ‡ป๐Ÿ‡ณ Vietnamese ยท ๐Ÿ‡ฟ๐Ÿ‡ฆ Xhosa ยท ๐Ÿ‡ฟ๐Ÿ‡ฆ Zulu

WER/CER between 5 and 10

Usable, but less polished (17 languages). ๐Ÿ‡ฆ๐Ÿ‡ฑ Albanian ยท ๐Ÿ‡ฒ๐Ÿ‡ผ๐Ÿ‡ฟ๐Ÿ‡ฒ Chichewa/Nyanja ยท ๐Ÿ‡ฎ๐Ÿ‡ณ๐Ÿ‡ต๐Ÿ‡ฐ Eastern Punjabi ยท ๐Ÿ‡บ๐Ÿ‡ฌ Ganda ยท ๐Ÿ‡ฎ๐Ÿ‡ธ Icelandic ยท ๐Ÿ‡ฎ๐Ÿ‡ช Irish ยท ๐Ÿ‡ฉ๐Ÿ‡ฟ Kabyle ยท ๐Ÿ‡จ๐Ÿ‡ป Kabuverdianu ยท ๐Ÿ‡ฐ๐Ÿ‡ช Kamba ยท ๐Ÿ‡ป๐Ÿ‡ฆ Latin ยท ๐Ÿ‡ฑ๐Ÿ‡บ Luxembourgish ยท ๐Ÿ‡ช๐Ÿ‡น๐Ÿ‡ฐ๐Ÿ‡ช Oromo ยท ๐Ÿ‡ฆ๐Ÿ‡ซ Pashto ยท ๐Ÿ‡ต๐Ÿ‡ฐ๐Ÿ‡ฎ๐Ÿ‡ณ Sindhi ยท ๐Ÿ‡ธ๐Ÿ‡ด Somali ยท ๐Ÿ‡ฆ๐Ÿ‡ด Umbundu ยท ๐Ÿ‡ฌ๐Ÿ‡ง Welsh