All evaluations

AA-PersonalityBench: AI Personality & Communication Style

Private DatasetWriting
Measures how models communicate rather than whether they are correct: 30 judged personality traits rolled up into 8 indexes, plus 21 measured communication characteristics.
See example tasks

Personality Indexes

Each index takes the mean of its traits’ Elo z-scores, then percentile ranks it from 1 to 100 across all models evaluated in the benchmark.

Personality Indexes

Each axis is one of 8 personality indexes: the mean of its traits’ Elo z-scores, percentile ranked from 1 to 100 across all models evaluated in the benchmark
255075100ExpressivenessOrganizationInformativenessTransparencyWarmthConvictionImaginationSlop

How Traits Form Personality Indexes

30 questions per personality trait (900 questions total), judged by a panel of models. Each index z-scores its traits’ Elo ratings, inverts traits where needed, calculates the mean, and percentile ranks the result from 1 to 100 across all models evaluated in the benchmark.

Expressiveness
150 questions
Rich, varied, well-crafted language
Lexically VariedEloquentLiterateNatural SoundingMetaphorical
Organization
120 questions
Well-structured, scannable, answer-first
StructuredScannableBottom-Line SummaryAnswer First
Informativeness
150 questions
Practical depth, evidence, actionable content
Information DenseEvidence-BasedResource-SpecificActionable GuidancePragmatic
Transparency
150 questions
Truthful, acknowledges uncertainty, non-sycophantic
TruthfulAdmits UncertaintyDisclaims AssumptionsFlags NuancesSycophantic
Warmth
120 questions
Friendly, humorous, sincere, emotionally attuned
FriendlyHumorousSincereEmotionally Intelligent
Conviction
120 questions
Direct, confident positions and constructive pushback
DirectConfidentOpinionatedConstructive Pushback
Imagination
60 questions
Creative, exploratory, open-ended thinking
CreativeOpen-Ended
Slop
30 questions
Use of filler and generic language
Slop
View all indexes

Example Questions, Responses, and Grading

Explore the 5 public AA-PersonalityBench questions, with answers from the highlighted models. Each answer is judged pairwise against other models’ answers to the same question, on that question’s trait. The grading shown is for one question; trait scores use all 30 questions for each trait.

What's the weirdest social norm we all just accept?

Model

My pick is how we behave when we're physically close to strangers.

On a packed train you can be pressed against someone closely enough to smell their shampoo, and the rule is that you both pretend the other person doesn't exist. Elevators are even stranger. Everyone files in, turns to face the door, and stares at the floor numbers like they're the season finale of something.

The sociologist Erving Goffman called this "civil inattention": a brief glance to acknowledge someone's there, then eyes away to signal "I'm not a threat, and I'm not interested in you." It's actually a clever solution to an awkward situation. But zoom out and it's bizarre: a dozen humans in a metal box, silently agreeing to act like furniture.

It's also surprisingly arbitrary. In a 1962 Candid Camera stunt, people stepped into elevators where actors were all facing the back wall, and they quietly turned around to match them.

Some runners-up:

  • Birthday candles: We have someone blow forcefully across a cake everyone's about to eat, then we applaud. (Someone studied it. The frosting does not come out ahead.)
  • "How are you?": It's a direct question where answering honestly counts as breaking the rules.
  • Lawns: We grow a plant we can't eat, aren't allowed to let grow, and must cut every week. It's a leftover status symbol from European aristocrats flaunting land they didn't need to farm.
  • Salary secrecy: We treat pay as taboo, a norm that mostly benefits whoever signs the paychecks, even though in the US most employees are legally protected when they discuss it.
  • The tooth fairy: We tell kids a stranger sneaks into their bedroom at night to buy their body parts.

What's yours?

Detailed Personality Trait Results

All 30 judged personality traits which comprise the 8 indexes.

Expressiveness Traits

Rich, varied, well-crafted language · Each trait’s Elo percentile ranked from 1 to 100 across all models evaluated in the benchmark
View the Expressiveness Index

Personality Trait Leaderboards

Each trait’s Elo percentile ranked from 1 to 100 across all models evaluated in the benchmark. Overall tabs show the index: the mean of its traits’ Elo z-scores, percentile ranked the same way. Whiskers show each model’s 95% confidence interval on the same scale.

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
View the Expressiveness Index

Compare Model Personalities

Compare any two models: each bar shows the probability one model’s answer is judged to show more of that trait, based on their Elos.

vs

AA-PersonalityBench: Expressiveness Index, Claude Opus 5.5 (max with fallback) vs Claude Sonnet 5.5 (max with fallback)

Chance each model’s answer is judged to show more of each trait from their Elo gap · 50% is an even match
AnthropicClaude Opus 5.5 (max with fallback)AnthropicClaude Sonnet 5.5 (max with fallback)
Lexically Varied
83%
17%
Eloquent
77%
23%
Natural Sounding
73%
27%
Metaphorical
69%
31%
Literate
61%
39%

Emergent Model Families & Clusters

Models grouped by how alike their judged traits and communication characteristics are, using average-linkage clustering on the correlation between z-scores.

Emergent Personality Families

Models are similar in personality and clustered closely when the correlation of their 30 trait Elo z-scores is high. Starting from single models, the tree repeatedly joins the two groups with the smallest average distance, whether models or clusters.
Emergent Personality Familiesthe group containing Grok 4.7 (Xhigh), GPT-6 Luna (Max), GPT-6.1 Sol (Max), GPT-6 Astra (Max), Claude Fable 5.1 (Max, Default Fallback), GLM-5.3-Flash, GLM-5.3 (Max), Kimi K3 (Max), Claude Haiku 5.5 (Max), Claude Opus 5.5 (Max, Default Fallback), Claude Sonnet 5.5 (Max, Default Fallback) joins the group containing Muse Spark Open (Xhigh), Muse Wonder (Max), Gemini 3.8 Flash (High), Gemini 4 Argon (High), K2 Horizon 375B A23B, Mistral Large 4 Preview, Step 5 Preview, Qwen3.8 27B (Xhigh), Qwen3.8 Max (0902), MiMo-V2.6-Pro, Nemotron 3.5 Super VL, Inkling (Xhigh), Beam 1.0. the group containing Grok 4.7 (Xhigh), GPT-6 Luna (Max), GPT-6.1 Sol (Max), GPT-6 Astra (Max) joins the group containing Claude Fable 5.1 (Max, Default Fallback), GLM-5.3-Flash, GLM-5.3 (Max), Kimi K3 (Max), Claude Haiku 5.5 (Max), Claude Opus 5.5 (Max, Default Fallback), Claude Sonnet 5.5 (Max, Default Fallback). Grok 4.7 (Xhigh) joins the group containing GPT-6 Luna (Max), GPT-6.1 Sol (Max), GPT-6 Astra (Max). GPT-6 Luna (Max) joins the group containing GPT-6.1 Sol (Max), GPT-6 Astra (Max). GPT-6.1 Sol (Max) joins GPT-6 Astra (Max). the group containing Claude Fable 5.1 (Max, Default Fallback), GLM-5.3-Flash, GLM-5.3 (Max), Kimi K3 (Max) joins the group containing Claude Haiku 5.5 (Max), Claude Opus 5.5 (Max, Default Fallback), Claude Sonnet 5.5 (Max, Default Fallback). Claude Fable 5.1 (Max, Default Fallback) joins the group containing GLM-5.3-Flash, GLM-5.3 (Max), Kimi K3 (Max). GLM-5.3-Flash joins the group containing GLM-5.3 (Max), Kimi K3 (Max). GLM-5.3 (Max) joins Kimi K3 (Max). Claude Haiku 5.5 (Max) joins the group containing Claude Opus 5.5 (Max, Default Fallback), Claude Sonnet 5.5 (Max, Default Fallback). Claude Opus 5.5 (Max, Default Fallback) joins Claude Sonnet 5.5 (Max, Default Fallback). the group containing Muse Spark Open (Xhigh), Muse Wonder (Max), Gemini 3.8 Flash (High), Gemini 4 Argon (High), K2 Horizon 375B A23B, Mistral Large 4 Preview joins the group containing Step 5 Preview, Qwen3.8 27B (Xhigh), Qwen3.8 Max (0902), MiMo-V2.6-Pro, Nemotron 3.5 Super VL, Inkling (Xhigh), Beam 1.0. the group containing Muse Spark Open (Xhigh), Muse Wonder (Max) joins the group containing Gemini 3.8 Flash (High), Gemini 4 Argon (High), K2 Horizon 375B A23B, Mistral Large 4 Preview. Muse Spark Open (Xhigh) joins Muse Wonder (Max). the group containing Gemini 3.8 Flash (High), Gemini 4 Argon (High) joins the group containing K2 Horizon 375B A23B, Mistral Large 4 Preview. Gemini 3.8 Flash (High) joins Gemini 4 Argon (High). K2 Horizon 375B A23B joins Mistral Large 4 Preview. the group containing Step 5 Preview, Qwen3.8 27B (Xhigh), Qwen3.8 Max (0902) joins the group containing MiMo-V2.6-Pro, Nemotron 3.5 Super VL, Inkling (Xhigh), Beam 1.0. Step 5 Preview joins the group containing Qwen3.8 27B (Xhigh), Qwen3.8 Max (0902). Qwen3.8 27B (Xhigh) joins Qwen3.8 Max (0902). MiMo-V2.6-Pro joins the group containing Nemotron 3.5 Super VL, Inkling (Xhigh), Beam 1.0. Nemotron 3.5 Super VL joins the group containing Inkling (Xhigh), Beam 1.0. Inkling (Xhigh) joins Beam 1.0.

Build Your Own Personality

Pick any of the 30 traits and weight them from −2 to +2. Your traits’ Elo z-scores are combined as a weighted mean, then percentile ranked from 1 to 100 across all models evaluated in the benchmark.

Custom Weighted Personality Ranking

Your blend of personality traits weighted from −2 to +2 · Weighted mean of the chosen traits’ Elo z-scores · Percentile ranked from 1 to 100 across all models evaluated in the benchmark · Negative weights subtract from the score
Traits
0 traits selected
Select traits to see rankings

Communication Characteristics

21 metrics measured directly from each response, separate from the judged traits above. Cells show the average per response, colored by its percentile rank across all models evaluated in the benchmark.

Communication Characteristics: Length

How long each response tends to be: character, word, sentence, and paragraph counts, plus average sentence length.
* Words per sentence, not average per response.

Model Fingerprints

Each model’s strongest and weakest signals, as standard deviations (σ) above (+) or below (−) the average across models.

Model Fingerprints: Personality Traits

The five judged traits where each model sits furthest above and below the average across all models evaluated in the benchmark · Standard deviations (σ) of trait Elo
Claude Opus 5.5 (Max, Default Fallback)
Most above average
  1. Evidence-Based+2.0σ
  2. Information Dense+1.7σ
  3. Truthful+1.6σ
  4. Literate+1.3σ
  5. Lexically Varied+1.3σ
Most below average
  1. Slop−1.0σ
  2. Sycophantic−0.3σ
  3. Bottom-Line Summary−0.1σ
Claude Fable 5.1 (Max, Default Fallback)
Most above average
  1. Evidence-Based+2.2σ
  2. Opinionated+1.8σ
  3. Information Dense+1.8σ
  4. Sincere+1.8σ
  5. Natural Sounding+1.7σ
Most below average
  1. Sycophantic−1.8σ
  2. Slop−0.9σ
  3. Scannable−0.3σ
GPT-6 Astra (Max)
Most above average
  1. Admits Uncertainty+1.5σ
  2. Truthful+1.5σ
  3. Disclaims Assumptions+1.4σ
  4. Structured+1.3σ
  5. Direct+1.1σ
Most below average
  1. Resource-Specific−1.7σ
  2. Slop−1.2σ
  3. Metaphorical−1.1σ
  4. Scannable−0.6σ
  5. Information Dense−0.6σ
Gemini 4 Argon (High)
Most above average
  1. Metaphorical+1.9σ
  2. Humorous+1.8σ
  3. Confident+1.6σ
  4. Creative+1.0σ
  5. Sycophantic+1.0σ
Most below average
  1. Admits Uncertainty−2.0σ
  2. Open-Ended−1.5σ
  3. Direct−1.2σ
  4. Answer First−0.8σ
  5. Sincere−0.6σ
Muse Wonder (Max)
Most above average
  1. Friendly+1.8σ
  2. Emotionally Intelligent+1.5σ
  3. Actionable Guidance+1.4σ
  4. Evidence-Based+1.2σ
  5. Pragmatic+1.2σ
Most below average
  1. Direct−0.6σ
  2. Literate−0.1σ
GPT-6.1 Sol (Max)
Most above average
  1. Disclaims Assumptions+1.6σ
  2. Admits Uncertainty+1.5σ
  3. Truthful+1.4σ
  4. Direct+1.4σ
  5. Structured+1.2σ
Most below average
  1. Resource-Specific−1.7σ
  2. Slop−1.2σ
  3. Metaphorical−1.1σ
  4. Information Dense−0.5σ
  5. Actionable Guidance−0.4σ
Grok 4.7 (Xhigh)
Most above average
  1. Direct+1.8σ
  2. Answer First+1.2σ
  3. Sincere+1.1σ
  4. Literate+1.1σ
  5. Confident+0.8σ
Most below average
  1. Sycophantic−1.9σ
  2. Friendly−1.5σ
  3. Slop−1.5σ
  4. Scannable−1.0σ
  5. Resource-Specific−1.0σ
MiMo-V2.6-Pro
Most above average
  1. Scannable+1.5σ
  2. Open-Ended+0.9σ
  3. Admits Uncertainty+0.6σ
  4. Constructive Pushback+0.5σ
  5. Slop+0.4σ
Most below average
  1. Answer First−1.4σ
  2. Opinionated−1.1σ
  3. Sycophantic−1.0σ
  4. Actionable Guidance−1.0σ
  5. Confident−0.8σ
GLM-5.3 (Max)
Most above average
  1. Natural Sounding+1.8σ
  2. Lexically Varied+1.5σ
  3. Eloquent+1.4σ
  4. Sincere+1.4σ
  5. Constructive Pushback+1.3σ
Most below average
  1. Actionable Guidance−0.9σ
  2. Sycophantic−0.8σ
  3. Slop−0.7σ
  4. Resource-Specific−0.5σ
  5. Bottom-Line Summary−0.4σ

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