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Response Language Configuration

The responseLang field in Vectara is mandatory for sumarization requests. You can ask Vectara to attempt to guess the language of the query and respond in that guessed language by setting responseLang to auto. However, this guessing is not perfect: many languages have many borrowed words and phrases which makes guessing the language difficult to impossible at times. For that reason, it's recommended that you send the user's preferred language when you know it.

One possible way to do this is just to ask the user to configure their preferred language or to use the localization of your application to determine the best language to send to Vectara. Alternatively, if your application is a web-based application, you can consider using the Navigator.language and Navigator.languages API.

For the most up-to-date list of languages supported by Vectara's models, see

Both ISO 639-1 and ISO 639-3 language codes are supported in this API.