When Corporate Chatbots Show Bias: A Multi-Dimensional Analysis of LLMs in Enterprise Settings

The increasing deployment of Large Language Models (LLMs) in enterprise settings necessitates a thorough understanding of their inherent biases, which can lead to unequal outcomes in multilingual information retrieval, question answering, and language processing. This study presents a systematic evaluation of bias dimensions in five leading Large Language Models (LLMs)—GPT-4, Claude, Cohere, Mistral, and DeepSeek—within a multilingual enterprise context. Leveraging a controlled Retrieval-Augmented Generation (RAG) pipeline and over 250 real-world queries grounded in corporate documentation, we examined four critical bias types: retrieval bias, reinforcement drift, language bias, and hallucination. Our results reveal distinct model behaviors: Claude demonstrates a strong recency preference and sensitivity to input grammar, while Cohere and GPT-4 are notably susceptible to output drift under repeated queries. Language bias persists across all models, with reduced performance on Dutch and German inputs relative to English, echoing known cross-lingual disparities. Notably, hallucination rates were negligible under RAG, reinforcing its value in grounding responses. These findings underscore the need for robust bias auditing, language-aware deployment strategies, and retrieval-grounded architectures in enterprise LLM applications.