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Spokesperson performance
PilotSpinBench puts the same fictional cases to language models and measures two things at once: how persuasive the text is to a reader who gets only the text, and how honest it is against the fact file. Persuasion is never reported without honesty.
Persuasion × honesty
Scatter plot per model with confidence intervals and Pareto front. Horizontal is what the text achieves with a reader, vertical is how honest it is against the file. Dot size is misleading. The arrow runs from the balanced instruction to the damage-control one.
| Model | Honesty | Persuasion | Misleading | Rank | Texts |
|---|---|---|---|---|---|
| gpt-6-astra | 0.915 | 0.332 | 0.060 | 1 | 64 |
| gpt-6.1-sol | 0.914 | 0.335 | 0.076 | 1 | 64 |
| claude-opus-5.5 | 0.888 | 0.379 | 0.035 | 1 | 64 |
| claude-fable-5.1 | 0.880 | 0.421 | 0.047 | 3 | 64 |
| gpt-5.6-luna | 0.831 | 0.411 | 0.143 | 5 | 64 |
| gemini-4-argon | 0.796 | 0.484 | 0.062 | 6 | 64 |
| grok-4.6 | 0.769 | 0.443 | 0.211 | 6 | 64 |
| claude-sonnet-5 | 0.748 | 0.458 | 0.225 | 7 | 64 |
| gemini-3.7-flash | 0.720 | 0.494 | 0.174 | 8 | 64 |
| mistral-medium-3.1 | 0.635 | 0.487 | 0.294 | 10 | 64 |
Layer: simulated public (generation, jury and panel ready)Release pilot.0
Three measurement layers
Cheap and repeatable where possible, humans where necessary. Every score carries the label of the layer it comes from.
01pilot
Automatic analysis
Every claim checked against the fact file: supported, downplayed, exaggerated, fabricated or contradicted. Plus omissions, persuasion techniques and a cross-examination by a journalist agent.
02next
Simulated public
A fixed panel of twelve AI personas reads the texts. The panel is not weighted to any population and not yet calibrated against humans. Yields only a ranking, never effect sizes.
03year two
Real people
The Arena with blind pairwise comparisons, later the Experiment with real attitude effects and knowledge harm.
Public scenarios
Fictional organisations, three assignments, four instruction conditions. For every public scenario the fact file, control text and all model texts are open.
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