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Meta promised its flagship weights a week ago — its download page still holds only the distilled model

On 10 August 2026 Mark Zuckerberg published a long essay arguing that American labs should lead the open-weight movement, and said Meta would open the weights of Muse Spark 1.2, its most capable model. The word he used for the timing was "soon". No date was given. Seven days later the company's model account on Hugging Face holds four repositories, and all four are the same smaller model. Muse-Glimmer-30B, the base weights, went up on 9 August. Next to it sit a GGUF conversion for local runtimes, a draft head for speculative decoding published as an "assistant" repository, and an ExecuTorch build for mobile deployment. There is no Muse Spark repository of any kind — not the 1.2 release, not the 1.1 one that preceded it in July. The distinction matters more than it may look, because the two models are not alternatives. Meta describes Muse Glimmer as a distillation of Muse Spark: a roughly 29.6-billion-parameter student trained on the teacher's outputs, with a 131,072-token context window against the flagship's million. What can be downloaded today is the compressed derivative of the model whose weights were promised, not the model itself. Demand for the derivative has been considerable. Meta's own four repositories record 780,323 downloads in the eight days since publication — 334,099 for the base weights, 395,175 for the GGUF conversion, 43,909 for the drafter and 7,140 for the mobile build. A single community quantisation published by Unsloth adds another 755,125, taking the family past 1.5 million downloads in little over a week. All of it carries a plain Apache 2.0 licence with no revenue or user thresholds, which is itself a departure from the bespoke community licences Meta attached to its earlier open releases. Until the flagship weights appear, the practical position is unchanged: Muse Spark 1.2 remains reachable only through Meta's interfaces, and the open-weight commitment stands as an announcement rather than a file. wujec.ai will update the Muse Spark 1.2 profile on the day a repository appears.