Scores Don't Drift
Ask a chatbot to grade the same essay twice and you may get two different scores — that's score drift, the inevitable product of grading by feel. Stability is forced by the completeness of the evaluation system: scoring is locked onto five fixed dimensions, each one placed against calibration anchors before a point value is assigned, leaving the model no room to improvise; and the total is machine-verified — if the five dimensions don't add up, the entire evaluation is discarded and rerun. Under these constraints, the same essay converges to the same narrow band; the full evaluation follows fixed internal rules to arrive at the final value.
Your score changes only when your essay does — that's what makes “revise and re-evaluate” meaningful.