AA-PersonalityBench ranks Anthropic’s Claude models highest in information density and literacy

For years, AI benchmarks have mostly asked one question: did the model get it right? Artificial Analysis now wants to know something else: how did the model sound while getting it right? The firm’s new AA-PersonalityBench grades AI models on writing style and communication traits. Anthropic’s Claude models came out on top in two categories, Information Density and Literacy. What the benchmark actually measures AA-PersonalityBench launched on October 19, 2026, with data available as of October 20. It is built around 900 questions. Those questions cover 30 subjective personality traits. The traits are grouped into eight indexes, including Informativeness and Expressiveness. The benchmark also tracks 21 characteristics that can be measured directly. These include things like response length and structure. Scoring relies on blinded, randomized pairwise comparisons. Two responses are placed side by side with the model names hidden, and one is judged better on a given trait. Those head-to-head results feed into a Firth-penalized Bradley-Terry Elo scoring methodology, combined with z-scores. How Claude scored Anthropic’s lineup performed strongly across the two headline categories. Four C...