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Large Language ModelsAI Business & IndustryFortune AIPublished: Sep 12, 2026, 19:00 JST2 min read

Rosetta Stone's Todd Hughes: AI can't replace talking to people

Rosetta Stone's Todd Hughes: AI can't replace talking to people

3 Key Points

  1. What happened

    Todd Hughes, who trains language tutors at Rosetta Stone, told Fortune that AI can build vocabulary and aid comprehension, but proficiency still requires live human interaction. He says he's not ready to use AI for speaking practice.

  2. Why it matters

    Hughes draws a line between fluency (smooth, fast speech) and proficiency (understanding, finding words, and adapting when talk goes off script). Real conversation changes mid-flow, and he says AI doesn't grasp social cues yet.

  3. What to watch

    Duolingo chief product officer Cem Kansu told Fortune that real-time translation can help you understand someone now, but can't replace the cultural understanding and satisfaction of speaking yourself. The test is whether tools can teach tone, not just words.

WHO IT HITSLanguage learners who rely on apps and translation earbuds should hear this as a warning: tools can smooth an exchange or build vocabulary, but they don't prove you can handle an unscripted conversation. Corporate trainers and language-course providers may need to keep human practice in their programs.

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Context & Analysis

Hughes's own language history shows why a single label rarely captures ability. He describes his Spanish as near-native, can read and understand French extremely well but makes mistakes speaking it, and finds Danish reading easy while listening and pronunciation remain a challenge. That mix is why he approaches proficiency through four core skills—reading, writing, listening, and speaking—rather than a single number.

He has worked with technology in language education since 1995, when he wrote his dissertation on using it to acquire Spanish vocabulary. That long view shapes his wariness: AI can act like a huge library that never closes, generating reading material and exercises, but he sees a gap when it comes to speaking practice and the social cues around words.

The stakes for learners hinge on purpose. Duolingo says many people learn English for high-stakes reasons like a better job or higher education, and for them an accurate translation still doesn't demonstrate proficiency. If tools keep improving at vocabulary and comprehension but remain weak on tone and unscripted exchange, the likely split is between travelers who need a quick bridge and learners whose goals require sustained human practice.

FAQ
What's the difference between fluency and proficiency?
Hughes says fluency describes flow—how smoothly and quickly someone speaks. Proficiency is a broader measure of whether someone can understand, find vocabulary, and communicate accurately when a conversation moves somewhere unexpected.
What does Duolingo say about real-time translation?
Duolingo chief product officer Cem Kansu told Fortune that real-time translation can help you understand someone in the moment, but it can't replace the connection, cultural understanding, and personal satisfaction that come from learning and speaking a language yourself.
Why does Hughes think human interaction is necessary?
Hughes says words carry social baggage that must be learned from people. He gives the example of 'don't pull my leg' versus its Spanish counterpart that literally means 'don't pull my hair'—an app might swap them, but may not know tone or when an expression sounds playful or rude.

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