Examiner-level accuracy, every single time
Olex delivers consistent, examiner-level marking so teachers can spend less time on assessment admin and more time on what matters: teaching. Independently tested and verified against working examiners.
Book a Demo ›What Teachers Say
Teachers stay in control. Olex gives them consistent, reliable marks so they can focus on feedback, planning, and their students.
“Put 30 essays through Olex and every single one would be within a few marks of what I would give it as a senior examiner. This is the most accurate marker I have ever come across.”
“As an AQA examiner, I’d say Olex marks are ‘fair and reasonable’ 99.9% of the time and likely more accurate than the markers in your department. We’ve been double-marking 10% of scripts by hand throughout the year, and the Olex marks have held up almost every time.”
Accurate marks. Accurate feedback.
Accuracy is not only about the mark. The written formative feedback Olex produces is accurate, detailed and personalised, drawing on references from each pupil's own writing. Teachers tell us it gives pupils specific, usable next steps, not generic comments.
Consistent with experienced examiners
The study began with 98 scripts marked independently by Olex and multiple experienced examiners under blind conditions. This established the human comparison used throughout the results.
The evidence base was then expanded with a further 59 scripts carrying standardised seed marks supplied by a relevant awarding organisation. Olex has now been evaluated across 157 scripts in total.
English Literature
English Literature
English Language
English Language
RMSE (root mean squared error) is the average distance between the Olex mark and the official examiner mark. Lower is better.
Reliably within the examiner tolerance range
Olex is evaluated across three tolerance bands, providing a transparent view of its performance against both the strictest benchmark and the wider variation encountered in live marking. This gives teachers confidence in every mark.
The 10% tolerance is treated as the gold-standard benchmark. The 12.5% tolerance is used for the headline result, while the 15% band provides additional context.
Tolerance measures how close a mark is to the established reference mark, relative to the marks available for the task. For example, on a task worth 40 marks: 10% tolerance represents four marks in either direction; 12.5% tolerance represents five marks in either direction; 15% tolerance represents six marks in either direction.
How the study was run
Results based on blind-marking 157 GCSE scripts across English Literature and Language, covering multiple attainment levels and a range of texts and papers. All marks, from Olex and from experienced examiners, were compared independently against an established seed mark. Tolerance bands of 10%, 12.5% and 15% are drawn from published inter-examiner research; 12.5% is the most commonly cited live-marking threshold.
Let us show you how it works
Get a 30 minute demo from our team, to see how Olex applies assessment criteria, generates marks and keeps teachers in control. Simply pick a time below, or get in contact.
