Duolingo

Duolingo needed to update 100+ language courses monthly and launch new languages, but content creation was a major bottleneck. Each course update required extensive human linguist time.

Integrated GPT-4 into the content creation pipeline with a human review stage. AI generates initial lesson content, exercises, and cultural notes that human linguists then review and refine.

Content creation speed increased by 40%. Launched 7 new language courses in 6 months (previously would have taken 2 years). Course quality metrics maintained.