Llama is the highest-performing AI open source large language model developed by Meta AI for research and commercial use. It includes base language models ranging from 7 to 65 billion parameters, trained on trillions of tokens. Built on Llama 3, Meta AI is a leading AI assistant that integrates into various Meta platforms such as Facebook, Instagram, WhatsApp, and Messenger, providing users with a variety of features such as searching for information, generating images, and answering questions.