Language learning platform Duolingo has introduced a new capability called “Duolingo Max” which offers two features of GPT-4. “Explain my answer” by chatbot Duo to explain why your answer was correct or incorrect. Besides, “Roleplay” which allows you to act out various scenarios. Duolingo has been developing Duolingo Max in partnership with OpenAI since 2022. It is available through the Duolingo app or website ,but now just for iOS users. Moreover, the subscription fee in the US is $30 per month or $168 annually that is more expensive than the Duolingo Super/Plus subscription worthing $6.99 per month.