According to Yann LeCun on Twitter, he clarified that he did not contribute to the development of any Llama models directly. Llama 1 was created by a small team at FAIR-Paris, while Llama 2 through 4 were developed by the GenAI product organization, not FAIR. LeCun’s main contribution was advocating for Llama 2 to be open sourced. Since 2018, after stepping down from leading FAIR, he has focused on self-supervised learning for video, world models, and planning (source: Yann LeCun, Twitter, Nov 27, 2025). This highlights the growing trend of open sourcing advanced AI models and the importance of organizational structure in AI innovation, offering significant business opportunities for enterprises seeking transparency and collaborative development in generative AI.