This feature is in alpha, requires opting in, includes a limited selection of supported languages, and currently can only be used on the web at chat.openai.com.
Plan availability
All plans
Application availability
Web (chat.openai.com)
Supported browser languages
Chinese (zh-Hans)
Chinese (zh-TW)
French (fr-FR)
German (de-DE)
Italian (it-IT)
Japanese (ja-JP)
Portuguese (pt-BR)
Russian (ru-RU)
Spanish (es-ES)
Opt in to use ChatGPT in your preferred language
Visit chat.openai.com to sign in to ChatGPT on the web.
Update your browser language to any of the above supported languages.
Click Join alpha in the banner that should display in the UI in ChatGPT.
Experience an early preview of ChatGPT in your language. [Join alpha]
For example, here is the banner when the browser language is detected as Spanish for you to opt in:
You should now see the ChatGPT UI displayed in that language!