After getting a question wrong — or right — learners can tap a button called "Explain My Answer" to receive an AI-generated explanation of the grammar or vocabulary involved. They can ask follow-up questions as if chatting with a tutor. This feature launched in 2023 as a paid-only feature and became free for all users on January 1, 2026.

Launched March 14, 2023 exclusively for Duolingo Max subscribers, the feature uses a large language model to deliver a personalized explanation of why an answer was correct or incorrect, including relevant grammar rules and examples. Users can send follow-up questions and receive dynamic AI responses within the same session. Duolingo opened access to all users — free and paid — on January 1, 2026, citing high popularity and confidence in the AI's accuracy.