Llama 2 is an open-source large language model developed by Meta AI, which has been fine-tuned for dialogue-related applications and outperforms other open-source models across various benchmarks. The model was pre-trained using publicly available data and has a strong emphasis on openness and accessibility. It has several enhancements over its predecessor, including expanded pretraining corpus size and doubled context length, allowing it to learn from more extensive and diverse data sets. Llama 2 is also designed to deliver exceptional performance across various language processing tasks, with variants catering to different computational requirements and application scenarios. The model's release demonstrates Meta AI's dedication to advancing the field of AI through collaborative efforts and promoting transparency and responsibility in its development process.