Brilliant has unveiled Koji, an AI tutor designed to help learners with math and coding through interactive sessions that adapt to each student’s progress. The company says the tool is intended for homes, classrooms and self-paced study, with support across subjects ranging from grade school math to college-level topics.

The launch adds a conversational layer to Brilliant’s existing learning platform, which has long centered on problem-solving and visual instruction. Koji is presented as a personal tutor that asks questions, offers step-by-step guidance and adjusts the pace based on where a learner is struggling or succeeding. Brilliant says the goal is not simply to produce answers, but to help students understand the underlying concepts.

According to the company, each session is built to be visual and interactive rather than focused on memorization. The tutoring experience is meant to guide students through problems in a way that builds intuition over time. Brilliant also says Koji tracks what a learner has already mastered and uses that information to generate practice where it is needed most.

The AI tutor is being offered across a broad curriculum. On the math side, Brilliant lists topics such as arithmetic thinking, proportional reasoning, probability, visual algebra, equations, quadratics and calculus, along with additional courses. For computer science, the platform includes subjects like programming with variables, Python, functions, algorithmic thinking and an introduction to neural networks. It also covers science and data analysis areas, including circuits, digital circuits, quantum computing, data visualization, clustering, regression and prediction.

Brilliant is positioning Koji as a flexible option for families and teachers who want support outside traditional tutoring hours. The company highlights use cases such as last-minute test preparation, weekend study sessions and short learning windows before dinner. That scheduling angle reflects a broader trend in education technology, where AI tools are being marketed as always-available helpers that can fit around busy routines.

The company says the curriculum behind Koji was developed by learning experts and educators with ties to institutions including MIT, Harvard, Stanford, Cornell and Caltech. Brilliant has also emphasized its reputation in app stores and its broad user base, saying it has more than 100,000 five-star reviews and over 10 million learners worldwide.

Early testimonials featured by the company describe students making progress on topics such as slopes, algorithms and trigonometry, as well as teachers saying the system encourages students to engage with math more willingly. Those comments come from Brilliant’s own promotional material and have not been independently verified.

Koji arrives as schools, parents and education companies continue to experiment with AI tools for learning support. In that environment, product claims often focus on personalization, engagement and accessibility. Brilliant is framing its new tutor around all three, with an emphasis on making difficult material feel more approachable and less dependent on traditional one-on-one tutoring.

The company says the new experience is available through Brilliant’s app on iOS and Android, where users can get started by choosing between learner, parent or teacher modes. With Koji, Brilliant is extending its core pitch. That a world-class tutor can now be available in more homes, on a more flexible schedule, and in a format built around active problem solving.