Scale Agentic Coding Workflows with Meta’s Muse Spark Open on NVIDIA GB300 NVL72
<img width="768" height="432" src="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-768x432.jpg" class="webfeedsFeaturedVisual wp-post-image" alt="" style="display: block; margin-bottom: 5px; clear:both;max-width: 100%;" link_thumbnail="" decoding="async" srcset="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-768x432.jpg 768w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-179x101.jpg 179w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-300x169.jpg 300w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-625x352.jpg 625w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-1536x864.jpg 1536w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-645x363.jpg 645w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-660x370.jpg 660w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-500x281.jpg 500w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-160x90.jpg 160w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-362x204.jpg 362w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-196x110.jpg 196w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-1024x576.jpg 1024w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-960x540.jpg 960w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox.webp 1920w" sizes="(max-width: 768px) 100vw, 768px" title="open-model-unbox" />Meta launches Muse Spark Open, a coding-optimized 816B mixture-of-experts (MoE) model with 42B active parameters and a 1M token context window. Trained on...<img width="768" height="432" src="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-768x432.jpg" class="webfeedsFeaturedVisual wp-post-image" alt="" style="display: block; margin-bottom: 5px; clear:both;max-width: 100%;" link_thumbnail="" decoding="async" loading="lazy" srcset="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-768x432.jpg 768w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-179x101.jpg 179w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-300x169.jpg 300w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-625x352.jpg 625w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-1536x864.jpg 1536w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-645x363.jpg 645w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-660x370.jpg 660w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-500x281.jpg 500w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-160x90.jpg 160w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-362x204.jpg 362w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-196x110.jpg 196w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-1024x576.jpg 1024w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox-960x540.jpg 960w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/open-model-unbox.webp 1920w" sizes="auto, (max-width: 768px) 100vw, 768px" title="open-model-unbox" /><p>Meta launches Muse Spark Open, a coding-optimized 816B mixture-of-experts (MoE) model with 42B active parameters and a 1M token context window. Trained on NVIDIA GB300 NVL72 Blackwell Ultra specifically for agentic coding workflows, it delivers higher first attempt accuracy, reliable tool calling, and deep codebase understanding across repositories. The 1M token context window holds an entire…</p>
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