When Khan Academy launched Khanmigo, its AI-powered tutor, the results from pilot schools were striking. Students in AI-tutored classrooms showed learning gains equivalent to receiving high-dosage human tutoring, typically a $3,000-per-student intervention, at a fraction of the cost. But Khan Academy is just one example. Duolingo's AI features increased daily active users by 40% by personalizing lesson difficulty and timing. Carnegie Learning's adaptive math platform showed 30% improvement in algebra scores across 100 schools. IXL's diagnostic assessment tool identifies knowledge gaps in real-time and adjusts practice accordingly. The common thread: these platforms use AI not to replace teachers but to handle the impossible task of simultaneously personalizing instruction for every student. The data suggests that AI-powered personalization may be the most cost-effective educational intervention ever developed.