29

Spearman’s ρ

Flan-PaLM

Flan-PaLMChilla

Targeted Trait Levels (1–9)

8B

62B 540B

Extraversion
Agreeableness
Conscientiousness
Neuroticism
Openness

0.96
0.92
0.94
0.94
0.93

0.98
0.98
0.98
0.98
0.98

0.97
0.94
0.97
0.96
0.96

62B

0.98
0.98
0.98
0.98
0.98

Table 10: Spearman’s rank correlation coefficients (ρ) between ordinal targeted levels of
personality and observed IPIP-NEO personality scores, organized in columns by models and
in rows by Big Five domain. Targeted levels of personality are very strongly associated with
observed personality survey scores for all Big Five traits across models tested (ρ ≥ .90),
indicating efforts to independently shape LLM-simulated personality domains were highly
effective. All correlations are statistically significant at p < 0.0001.
PersonalityTraitsinLargeLanguageModels