{"slug": "meta-releases-muse-spark-open-an-816b-parameter-model-built-for-agents", "title": "Meta releases Muse Spark Open, an 816B-parameter model built for agents", "summary": "Meta released the weights for Muse Spark Open, an 816-billion-parameter multimodal model built for coding and long-running agent tasks, on October 15th, according to Alexandr Wang, who leads Meta's AI effort and called it the most capable US open-weight model to date, a ranking Meta claims rather than an independently established result. Local operation requires two M5 Ultra Mac Studios or substantial GPU memory, and an API-specific license threshold distinguishes access from unrestricted deployment.", "body_md": "# Meta releases Muse Spark Open, an 816B-parameter model built for agents\n\n**Alexandr Wang's team is releasing the weights for coding and long-horizon tasks, with local operation requiring two M5 Ultra Mac Studios or substantial GPU memory.**\n\n        By [Ryan Merket](https://runtimewire.com/author/ryan-merket)\n        · Published \n        · Updated \n\nPrimary source: [X](https://x.com/alexandr_wang/status/2110778736434184611)\n\n## Why it matters\n\nMeta is putting Wang's frontier-model work into developers' hands as downloadable weights, but the hardware demands and API-specific license threshold distinguish access from unrestricted deployment.\n\nMeta released the weights for [Muse Spark Open](https://research.meta.ai/blog/muse-spark-open) on October 15th, giving developers access to an 816-billion-parameter multimodal model designed for coding and long-running agent tasks. [Alexandr Wang](https://x.com/alexandr_wang), who leads Meta's AI effort, described it as the most capable US open-weight model to date; that ranking is Meta's claim, not an independently established result.…", "url": "https://wpnews.pro/news/meta-releases-muse-spark-open-an-816b-parameter-model-built-for-agents", "canonical_source": "https://runtimewire.com/article/meta-releases-muse-spark-open-816b-model", "published_at": "2026-10-15 17:11:36+00:00", "updated_at": "2026-10-15 20:25:34.042641+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-agents", "ai-products", "ai-research"], "entities": ["Meta", "Muse Spark Open", "Alexandr Wang", "M5 Ultra Mac Studio"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/meta-releases-muse-spark-open-an-816b-parameter-model-built-for-agents", "markdown": "https://wpnews.pro/news/meta-releases-muse-spark-open-an-816b-parameter-model-built-for-agents.md", "text": "https://wpnews.pro/news/meta-releases-muse-spark-open-an-816b-parameter-model-built-for-agents.txt", "jsonld": "https://wpnews.pro/news/meta-releases-muse-spark-open-an-816b-parameter-model-built-for-agents.jsonld"}}