Llama 3 is Meta's groundbreaking open-source large language model family that delivered performance competitive with GPT-4 class models while being freely available for research and commercial use. Its 8B and 70B parameter variants offer exceptional capability-per-compute efficiency, making powerful AI accessible to researchers and companies that cannot afford or prefer not to use closed commercial APIs. The release of Llama 3 catalyzed the open-source AI ecosystem, enabling thousands of fine-tuned variants, local deployment tools, and commercial applications built on a foundation model that rivals the best proprietary alternatives.