Duolingo’s stock crashes 38% after OpenAI’s GPT-5 demo builds language app in minutes

A showdown is brewing in language technology. Duolingo, the world’s most recognisable edtech brand, just watched its stock drop by 38 percent from its peak this summer. The sell-off followed Wall Street’s rocky reaction to sweeping promises about making Duolingo an “AI-first company,” but the real driver is competition from the biggest name in artificial intelligence: OpenAI.

OpenAI’s GPT-5 demonstration was the moment everything changed. Not only did the new model ace conversation and translation, it built a robust language learning app on the fly from a single prompt.