How does Koji, Brilliant's Tutor, work?
Koji is Brilliant's personal tutor, available inside courses to help you work through problems when you get stuck. Unlike a typical chatbot, Koji can see exactly what you're working on — including the interactive elements on screen — and guides you through the thinking step by step, without ever just giving you the answer. Think of it as having a patient tutor looking over your shoulder, available any time. What can Koji do? Koji answers whenever you are confused – always helping you walk through the thinking, never just giving you the answer. Koji can see what you've done so far, to help pinpoint where a misunderstanding lies. Koji can draw on and manipulate the learning environment to help things make sense. It's like an infinitely patient tutor, able to see over your shoulder. Is Koji AI? Yes. That said, while Koji is built in part with a third-party model, Koji's core behavior and actions are custom to Brilliant and built by our team, based on the pedagogy of our expert educators. For example, Koji can uniquely 'see' Brilliant's interactive components – and then interact with them to highlight or rearrange components to help explain something to a learner. Is Koji accurate? Because of how Koji is connected to Brilliant's overall learning and interactive infrastructure, Koji is exceedingly unlikely to make a math mistake (unlike other AI tutors) – a similar rate to the human errors we occasionally make in our content. Is Koji safe for kids? Koji was designed with safety in mind. Koji always stays on topic, and will not get into personal or topical conversations outside of the learning material. We have advanced safety filters turned on in the underlying models we use, and live alerts around any problematic conversations. We also are COPPA compliant. Further, all third-party services used for processing chats and audio with Koji have zero-data-retention, and are therefore not used in third-party model training. See our privacy policy for more info. Can I turn off Koji? Yes — though it works a little differently depending on your device: Desktop On Desktop, you can mute Koji by clicking the sound icon in the top left of the learning experience. You can also toggle this in account preferences. Mobile On Mobile, you can mute Koji by tapping on the sound icon in the top right of the screen. Note that this icon isn't always visible — you'll need to have the chat open to be able to see it. You can also toggle this setting via your account settings. In all cases, muting Koji will also disable Koji's speech bubbles from appearing (except for the small feedback messages indicating whether you got a question correct or incorrect). Which courses is Koji available on? Right now, Koji is available on most courses – nearly all of our foundational math and coding courses. Koji will be available on more advanced courses, like Calculus, later in 2026. How much can I use Koji on different plans? Free users get a limited preview of Koji — once that's used up, a Premium subscription is needed for full access. Premium subscribers have full, unlimited access to Koji.