Meta releases the most powerful US open model, yet still trails Chinese counterparts

On October 15, Meta released Muse Spark Open, an open-weights version of its neural network, which the company claims is the most powerful American open-weights model to date. According to internal benchmarks, the new model outperforms offerings from Nvidia and Thinking Machines in agentic tasks, though it still lags behind the Chinese Kimi K3 and GLM 5.3 models in overall rankings. The model features a massive 816 billion parameters, requiring significant hardware resources for local deployment. The article provides a detailed breakdown of the model card, licensing terms, Apple testing results, and hardware requirements for running Muse Spark Open. This release highlights the ongoing global race in open-source artificial intelligence, where competition between American and Chinese developers continues to intensify.