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📊 The Common European Framework of Reference (CEFR) is a language proficiency standard that is the basis of the Duolingo English Test scale and scoring. Like education, we also believe in democratizing research—so we've released an innovative tool that uses AI to automatically predict the CEFR level for words and passages. 📖 ⚙️ Learn more about how we did it in this blog post: https://making.duolingo.com/the-duolingo-cefr-checker-an-ai-tool-for-adapting-learning-content | Duolingo English Test