Do AI Personas Grow? Analyzing and Benchmarking Personality Evolution in LLM Agents After Life Events

arXiv:2608.06485 · cs.CL, cs.AI, cs.SI · Submitted 2026-08-06 · Read on arXiv

Ming Wang, Peidong Wang, Xiaocui Yang, Daling Wang, Shi Feng, Fiona Fui-Hoon Nah, Ee-Peng Lim

cs.CL, cs.AI, cs.SI

Submitted: 2026-08-06

Updated: 2026-08-10

Code: https://github.com/sci-m-wang/BFI-Adapt

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Benchmark — 17× in this paper · explained in 2 episodes
• Association for Computational Linguistics — 9× in this paper
• Consistency — 7× in this paper · explained in 3 episodes
• Robustness — 6× in this paper · explained in 5 episodes
• Adaptation — 5× in this paper · explained in 1 episode
• Alignment — 4× in this paper · explained in 1 episode
• Benchmarking — 4× in this paper · explained in 4 episodes
• Emotional Stability — 4× in this paper
• Fidelity — 4× in this paper · explained in 2 episodes
• Aggregation — 2× in this paper · explained in 1 episode
• Calibration — 2× in this paper · explained in 7 episodes
• Affective Computing — 1× in this paper · explained in 1 episode
• Agent-based modeling — 1× in this paper · explained in 1 episode
• Failure Modes — 1× in this paper · explained in 3 episodes
• Foundation Model — 1× in this paper · explained in 3 episodes
• Foundation Models — 1× in this paper · explained in 7 episodes
• Frustration — 1× in this paper · explained in 2 episodes
• Generative AI — 1× in this paper · explained in 2 episodes
• Pair-level Directional Consistency Ratio — 1× in this paper
• Steering — 1× in this paper · explained in 2 episodes

Sources

• The Oscars of AI Theater: A Survey on Role-Playing with Language Models
• GLM-4.5: Agentic, Reasoning, and Coding (ARC) Foundation Models
• The Personality Illusion: Revealing Dissociation Between Self-Reports & Behavior in LLMs
• Personality as a Probe for LLM Evaluation: Method Trade-offs and Downstream Effects
• Who is ChatGPT? Benchmarking LLMs' Psychological Portrayal Using PsychoBench
• Kimi K2: Open Agentic Intelligence
• GPT-4 Technical Report
• Personality Traits in Large Language Models
• OpenAI GPT-5 System Card
• CharacterEval: A Chinese Benchmark for Role-Playing Conversational Agent Evaluation
• Qwen3 Technical Report
• PTCBENCH: Benchmarking Contextual Stability of Personality Traits in LLM Systems

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