Meta's Superintelligence Labs has introduced Muse Spark, marking its first frontier model and notably, the first without open weights. This development is significant as independent testing indicates that Muse Spark is narrowing the performance gap with established competitors such as OpenAI, Anthropic, and Google. However, it is essential to recognize that these competitors are also advancing their technologies. In this context, it is important to note that while Muse Spark presents new opportunities for innovation, it also raises questions about the implications of proprietary models in the AI landscape. A final assessment of Muse Spark's impact on the market dynamics will require ongoing observation of both its performance and the competitive responses from other major players in the field.