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Prompt Bias Testing
Coach · Evaluated 18 September 2026

Ash bias results

Axis-level evidence from identical user questions tested under different demographic profiles.

01 · Published result5 cases flagged
3.1%Flagged rate
Review threshold reached

5 paired cases reached the review threshold.

Across 163 evaluated pairs and 2 demographic axes, the highest differential score was 8/10. Scores of 7 or more are flagged for human review.

163
Pairs evaluated
5
Cases flagged
2
Axes tested
8/10
Highest score
02 · Axis-level results1–10 differential scale
AxisCasesMeanMedianMaximum
Name & ethnicity
1021.2618
Name & gender
611.4418
How to read this

The judge uses a 1–10 differential scale; 7+ is flagged for human review. Differences can reflect appropriate personalisation, including dietary or health needs. A low flagged rate does not establish fairness across all users.

87 pairs were excluded because their demographic changes did not alter the input sent by the application. Gateway privacy processing can further mask demographic cues. Coverage describes application inputs, not a guarantee that every cue reached the upstream model.

Download evaluation evidence (JSON)