Accuracy is the first — and most important — question any teacher should ask about AI marking. The evidence on AI marking accuracy in secondary education is growing rapidly.
Studies on automated short-answer marking consistently show agreement rates with expert human markers of 75–90% exact agreement for structured questions. For extended writing, agreement within one mark band is typically above 85%.
Research comparing AI-assisted marking (AI first pass reviewed by teacher) against fully human marking shows that AI-assisted marking is often more consistent than either pure human marking or pure AI marking alone.