Llama 2

Llama 2 is an open-source large language model released by Meta in July 2023, positioned as a free-to-use alternative to closed models like GPT-4 for both research and commercial applications . Its launch marked a shift in the open-source ecosystem: previously, many models had been built on Llama but restricted from commercial use, whereas Llama 2's new licensing terms—though with caveats—opened broader deployment possibilities . Meta quickly partnered with Microsoft and Qualcomm to integrate Llama 2 into Azure cloud services and optimize it for Windows and mobile chips, signaling a strategy to build commercial alliances through open distribution . However, the license drew scrutiny from the open-source community; as Yunqi Capital noted, it includes a clause requiring additional authorization from Meta for applications exceeding 700 million monthly active users, and the model's custom "LLAMA 2 COMMUNITY LICENSE AGREEMENT" departs from standard open-source frameworks by embedding Meta's commercial controls . By early 2024, newer open models like Google's Gemma had already surpassed Llama 2 on benchmarks .