EF Corporate Learning introduced online language education as early as 1995. As the frontrunner in digital language learning, we therefore have access to 30 years of learner data – an invaluable asset for training LMMs and building AI tools. Our data shows us what digital tools are best for ensuring engagement and motivation, the actions and behaviors of a learner who is actively progressing in proficiency, and what are the traits of effective human teachers. With this unique, quantifiable data from millions of live classes and hours of self-study activities, we have been able to train AI models to reproduce the experience and results of one-on-one learning in a fully virtual environment.