Combine GPT-4 with Duolingo language learning and you have what appears to be a powerful tutor. Two features stand out: 'explain my answer', which as the name suggests, helps learners understand why their response was in error; and 'roleplay', which "allows learners to practice real-world conversation skills with world characters in the app." If these features work as advertised, I'm seeing less and less of a need for an 'authentic human connection' to make online language learning work. But I'd have to try it myself to be sure. I tried to actually create and pay for a subscription but it failed with a CORS error, which means the site is not secure. On the bright side, I tried the pre-test for Spanish, got most of the questions right, and was told "I'm clearly not a beginner." I never came close to finding the AI features, despite my efforts. Via Donald Clark on LinkedIn; and now also a blog post. See also IEEE Spectrum, How Duolingo's AI Learns What You Need to Learn.
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