Meta has released Llama 3.1, an open-source AI model that rivals the best closed-source models in flexibility, control, and capabilities. This release marks a pivotal moment in democratizing AI development, offering advanced features like expanded context length and multilingual support. The 405B version of Llama 3.1 boasts massive scale and advanced performance, with 405 billion parameters and training on over 15 trillion tokens. It supports up to 128K tokens for comprehensive content generation and handles eight languages, enhancing global application versatility. Llama 3.1 also introduces significant improvements in synthetic data generation and model distillation, paving the way for more efficient AI development and deployment. The model is designed to handle complex tasks with remarkable efficiency, leveraging a standard decoder-only transformer architecture with minor adaptations to maximize training stability and scalability. With its state-of-the-art capabilities, Llama 3.1 can unlock new possibilities in synthetic data generation, model distillation, and beyond.