Duolingo detailed its 2025 product highlights on December 10, 2025, including the launch of a new Chess course, the Duolingo Score metric, and 172 new language course expansions. Other key updates included expanded Video Call features with Lily and new interactive elements like Flashcard exercises and redesigned progression systems. DUOL closed at $197.44 (-5.57%) on December 10, showing weakness despite these announcements.