Spanish is not just one: A dataset of Spanish dialect recognition for LLMs.

This paper presents a dataset designed to assess the capability of Large Language Models (LLMs) in handling different Spanish dialects. While multilingualism is widely recognized as a crucial aspect of NLP, dialectal evaluation remains largely unexplored. Spanish, spoken by over 600 million people, exhibits significant lexical, morphological, and syntactic variation across regions. Recognizing these linguistic and cultural differences is essential for preserving smaller dialects, preventing their marginalization, and ensuring that Spanish is not reduced to a monolithic language. To address this gap, we introduce a dataset specifically designed to analyze whether LLMs can accurately identify different Spanish varieties while also measuring their potential preference for specific dialects. The dataset consists of 30 carefully crafted multiple-choice questions, requiring models to select the most appropriate option from different regional variations. Each question has been meticulously developed and reviewed by linguistic experts, undergoing multiple refinement cycles to ensure linguistic accuracy and effectiveness in detecting dialectal biases. This dataset represents an important step toward developing more inclusive and fair evaluation frameworks for Spanish Natural Language Processing (NLP). By identifying potential biases in LLMs and analyzing their ability to adapt to regional linguistic variations, this work contributes to the broader goal of equitable language representation in AI-driven text generation and comprehension tasks.