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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.
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