Meta's Llama 3.1 models, including the groundbreaking 405B model, are now available as open-source. These models offer enhanced capabilities in general knowledge, multilingual translation, and tool use. The 405B model, trained on 15 trillion tokens, sets a new standard for open AI with applications in synthetic data generation and model distillation. Meta provides extensive support for developers, including new safety tools and a request for comments on the Llama Stack API for broader ecosystem integration. The models are available for immediate development on platforms like AWS and Hugging Face.