Expressiveness Index
Rich, varied, well-crafted language. The index z-scores each component trait’s Elo across all models evaluated in the benchmark, calculates the mean with inverted traits entering negatively, and percentile ranks the result from 1 to 100.
Claude Fable 5.1 (Max, Default Fallback) ranks highest on expressiveness, while GPT-3.5 Turbo ranks lowest across the 36 models evaluated.
Across this index’s 5 traits, Elo scores average 3 to 1612, with a typical per-model 95% confidence interval of ±33 Elo, roughly ±4 points on the 1 to 100 scale.
Expressiveness Leaderboard
The mean of each model’s trait Elo z-scores, percentile ranked from 1 to 100 across all models evaluated in the benchmark. Whiskers show each model’s 95% confidence interval.
AA-PersonalityBench: Expressiveness Index
Rich, varied, well-crafted language · Mean of each model's Elo z-scores across lexically varied, eloquent, literate, natural sounding and metaphorical · Percentile ranked from 1 to 100 across all models evaluated in the benchmark
Component Traits
Expressiveness is built from the z-scored Elo of 5 traits. Open any trait for its full leaderboard.
Trait Leaderboards
Each component trait’s Elo percentile ranked from 1 to 100 across all models evaluated in the benchmark.
AA-PersonalityBench: Lexically Varied
Does the response vary vocabulary and phrasing instead of falling into repetitive patterns? · Trait Elo percentile ranked from 1 to 100 across all models evaluated in the benchmark