arXiv AI

The Limits of Automatic Evaluation of Creativity in Large Language Models

The paper examines whether existing automatic methods can reliably assess creativity in text produced by large language models (LLMs). By collecting human ratings on 11 creativity dimensions for both human and AI short stories, the authors compare these judgments with automated metrics and LLM-as-a-Judge evaluations. The results show a significant misalignment: automated metrics and LLM judges favor AI-generated stories and show near-zero correlation with human assessments, revealing fundamental limitations in current computational approaches to evaluating creative text.

arXiv Computation and Language
Sep 2

Evaluating Style-Personalized Text Generation: Challenges and Directions

The paper "Evaluating Style-Personalized Text Generation: Challenges and Directions" examines the difficulties of assessing text that is tailored to individual users’ styles. It critiques common metrics such as BLEU, embeddings, and LLM-as-judges, and introduces a style discrimination benchmark covering domain discrimination, authorship attribution, and LLM-generated personalized versus non-personalized discrimination across eight writing tasks. The study finds that ensembles of diverse evaluation metrics outperform single-evaluator approaches and offers guidance for reliable assessment of style-personalized generation.

By Anubhav Jangra, Bahareh Sarrafzadeh, Silviu Cucerzan, Adrian de Wynter, Sujay Kumar Jauhar
arXiv Computation and Language
2d ago

Evaluating LLM Creativity through Long-Tail Performance

The paper proposes that creativity in large language models can be measured by performance on the long tail of a reference input-output distribution, using n‑gram absence from pretraining data as a novelty proxy. Across 15 benchmarks and 26 open‑weight models, the authors find that creativity benchmarks occupy further tail regions than standard benchmarks and that higher‑tail subsets better align with human creativity judgments. They introduce a new diagnostic, q@Tail(α), to assess mean task quality on the tail fraction of existing benchmarks, revealing significant potential for improving LLM creativity through stronger tail performance.

By Yichen Wang, Tenghao Huang, Vishakh Padmakumar, Mina Lee