This research paper introduces Large Concept Models (LCMs), a novel approach to language modeling that operates on sentence embeddings instead of individual tokens. LCMs aim to mimic human-like abstract reasoning by processing higher-level semantic representations, improving long-form text generation and zero-shot cross-lingual performance. The authors explore various LCM architectures, including those based on mean squared error regression and diffusion models, and evaluate their performance on summarization and a novel summary expansion task. Their findings demonstrate that diffusion-based LCMs outperform other methods, exhibiting impressive zero-shot generalization across multiple languages. The research also explores the concept of incorporating explicit planning into the model to further enhance coherence in long-form text generation.