GPT-5.2 wins this run.
Correct and easiest to learn from. The verdict changes when the persona prioritizes speed over editability, so the disagreement remains visible.
Task library/Teaching answer
Explain why the harmonic series diverges
Give a correct proof, anticipate one misconception, and adapt the explanation for a first-year student.
Synthetic evaluation using demonstration outputs. Not real customer demand, adoption, or revenue.
OUTPUT VIEWER / RUN 04GPT-5.2
PROOF / GROUPING
1 + ½ + ⅓ + ¼ + … diverges
- Group terms in powers of two.
- Each group after the first sums to at least ½.
- There are infinitely many groups, so the partial sums exceed any bound.
Every new block adds another half; the total never settles.
What changed the decision
Scores follow the artifact. Every judgment stays attached to a visible state or recorded validator.
Task completion
The winning output completed the primary journey without recovery help in three repeated runs.
Persona fit
Founders chose the fastest usable path; specialists rewarded control and evidence depth.
Failure replay
The lowest-scoring output hid one critical action and lost state after the second step.
Continue the evidence trail.
Inspect the full task library or compare this winner against another model.