Meta pivots again to open-weight AI models with new releases and Zuckerberg essay

Meta announced a renewed focus on open-weight large language models, unveiling a new open model called Muse Glimmer and pledging to release the weights for its more powerful Muse Spark 1.2 model in the coming weeks. CEO Mark Zuckerberg also published a lengthy essay outlining the company's AI philosophy and governance stance, positioning Meta against rivals like OpenAI and Anthropic. Those companies rely on proprietary models and have lobbied the US government to address competition from Chinese labs offering open-weight models or model distillation.