Duolingo's stock experienced volatile trading following its strong second-quarter earnings report, initially surging more than 30% before closing up 13.75%. The company reported aggressive revenue growth over the past five years and recently achieved operational profitability. CEO Luis von Ahn highlighted the company's strategic shift to an "AI-first" approach starting in April 2025, which involved phasing out contractor roles and expanding course offerings using generative AI, including new subjects like music, mathematics, and chess. This AI integration has contributed to boosted earnings and helped drive user engagement despite a slowdown in new user growth in recent quarters. The release of OpenAI's GPT-5 model partially offset Duolingo's stock gains. Duolingo also updated its 2025 annual revenue forecast, reflecting positive impacts from its AI initiatives.