The releases signal Meta’s return to open-source AI after Zuckerberg previously said the company would “resume releasing some open source models soon.” His latest push also comes as Chinese open-weight models gain ground among US businesses. Zuckerberg said open-source AI could account for a large share of global AI use. Chinese companies including DeepSeek, Alibaba and Z.ai have developed open-weight models that are gaining attention for competitive performance and lower costs. DeepSeek is barred from US intelligence-community systems, while lawmakers have proposed wider restrictions on Chinese AI models.