Meet Chalk-1: the tutor that speaks, listens and writes — all at once
Jul 14, 2026
Ask a chatbot to teach you quadratics and it will write you an essay about quadratics. That is not teaching. A real tutor does something completely different: they talk to you while writing on a board, watching your reaction, pausing when you frown, asking you questions instead of answering their own.
No general-purpose chatbot can do that — because holding a conversation while drawing a live diagram and listening for your response is not a feature you can prompt into existence. It is a capability you have to train a model for. So we trained one.
What Chalk-1 is
Chalk-1 is brightboard’s own teaching model. It thinks, speaks, listens and drives an interactive whiteboard at the same time — writing equations, sketching diagrams and annotating as it explains, the way a tutor’s pen never stops moving while they talk. It was trained on thousands of hours of real tutoring, and it learns the shape of real lessons: when to explain, when to ask, and when to shut up and let you try.
It is also aligned to your exam board. Chalk-1 does not teach generic maths — it teaches the topic the way AQA, Edexcel or OCR will examine it.
Checked before it reaches the board
Teaching demands a higher bar for accuracy than chat. So every step Chalk-1 writes passes through a live checking layer before it appears on the board. Fewer than 2% of steps are ever corrected — and the ones that are, you never see.
Measured against the frontier
We benchmark every version of Chalk-1 by having it teach complete lessons that are scored blind against a frontier model. The current version scores 4.30 on a 5-point teaching rubric, against the frontier benchmark’s 4.35 — and it runs for a tiny fraction of the cost, which is exactly what makes an always-on tutor affordable. You can see the full trajectory on our technology page.
Every brightboard lesson makes the next version better. That is the whole idea: a tutor that is already very good, improving every week, and priced so that every family can actually have one.