{"slug": "meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work", "title": "Meta releases 816B-parameter Muse Spark Open for coding and agent work", "summary": "Meta Platforms Inc. released open weights for Muse Spark Open, an 816-billion-parameter model with 42 billion parameters active per token, built for coding and long-running agent work. Meta said the model cleared release thresholds in its Meta Superintelligence Scaling Framework and scored 61.8 on the JobBench agent test, more than double the 31.1 recorded by Thinking Machines Lab's Inkling, while trailing Chinese models such as Kimi K3 (85) on Terminal-Bench 2.1 with 76.4. The weights ship under the new Muse Model License, which charges no fee for adaptation or embedding but requires a separate agreement for companies selling it as a hosted service with more than $20 million in gross revenue over 12 months, and bars military and critical infrastructure uses.", "body_md": "### Meta releases 816B-parameter Muse Spark Open for coding and agent work\n\nMeta Platforms Inc. [today released](https://research.meta.ai/blog/muse-spark-open) open weights for its Muse Spark artificial intelligence model, which had been proprietary since its [April debut](https://siliconangle.com/2026/04/08/meta-debuts-muse-spark-multimodal-reasoning-model/).\n\nThe release, called Muse Spark Open, is built for coding and long-running agent work. Meta describes it as the most capable open-weight model to come out of a U.S. lab so far. Only 42 billion of the model’s 816 billion parameters switch on for any given token. Prompts can mix text with images, audio or video, and Meta has set the context window at up to 1 million tokens.\n\nThe starting point was Muse Spark 1.2, shipped in August, and Meta then added safety post-training so the model holds up without the guardrails of Meta’s own services. Meta said Muse Spark Open cleared the release thresholds in its Meta Superintelligence Scaling Framework, with a full evaluation report still to come. A [technical writeup from Hugging Face Inc.](https://huggingface.co/blog/meta-muse-spark-open) says training leaned on what Meta calls “real developer workflows,” including multi-file refactors and long debugging sessions.\n\nMeta also tested the model away from the data center, on a pair of Apple Inc. Mac Studio desktops with M5 Ultra chips that Apple’s MLX framework linked into one system. The two machines had about a terabyte of memory between them.\n\n[Muse Code](https://siliconangle.com/2026/08/05/meta-takes-anthropic-openai-first-ai-coding-agent-muse-code/) ran on that setup while the coding terminal worked through bug fixes and new features for the open-source Mastodon client Ice Cubes. Footage in DaVinci Resolve was the other test, and the model went through it frame by frame to pick out and crop the best shots for vertical video.\n\nIn Meta’s own benchmark table, Muse Spark Open scored 61.8 on the JobBench agent test, more than twice the 31.1 recorded by [Inkling](https://siliconangle.com/2026/07/15/mira-muratis-thinking-machines-drops-inkling-open-weights-model-anyone-can-access/), the U.S. open model from Thinking Machines Lab Inc. Nvidia Corp.’s Nemotron 3 Ultra trailed further at 27.2.\n\nChinese open models are stronger at coding. Kimi K3 led the Terminal-Bench 2.1 coding test at 85, and GLM 5.3 and Qwen3.8 both finished above Muse Spark Open’s 76.4.\n\nOn tool use the order flips, and Muse Spark Open’s 89.2 on MCP-Atlas beat every rival Meta listed, the Chinese models included. The benchmark gives a model plain-language tasks without naming the tools needed to complete them. Working out which of 220 tools across 36 live Model Context Protocol servers to call, and in what order, is left to the model.\n\nThe weights come with a new [Muse Model License](https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B) carrying what Meta calls “limited commercial terms,” and no fee applies to developers who adapt the model or ship it inside their own software. Meta requires a separate agreement from any company that sells the model as a hosted service and has passed $20 million in gross revenue over a 12-month period.\n\nProducts built on it have to show a “Built with Muse Spark Open” label. Military and critical infrastructure uses are off-limits.\n\nMeta’s previous open-weight release was the much smaller Muse Glimmer, a 30 billion-parameter model that went out [in August](https://siliconangle.com/2026/08/10/meta-releases-open-source-muse-glimmer-model-30b-parameters/). The company’s most capable systems remain closed, and the Muse Wonder models [introduced Monday](https://siliconangle.com/2026/10/12/meta-releases-muse-wonder-ai-models-built-to-run-personal-and-professional-agents/) are available only through the Meta Model API and Muse Code.\n\nSeven inference providers offer hosted access at launch, Groq Inc. and Fireworks AI Inc. among them. The weights can also be downloaded from Hugging Face or from the model catalogs of Amazon Web Services Inc., Google LLC and Microsoft Corp.\n\n##### Image: Meta\n\n# A message from John Furrier, co-founder of SiliconANGLE:\n\nSupport our mission to keep content open and free by engaging with theCUBE community. **Join theCUBE’s Alumni Trust Network**, where technology leaders connect, share intelligence and create opportunities.\n\n- **15M+ viewers of theCUBE videos** , powering conversations across AI, cloud, cybersecurity and more\n- **11.4k+ theCUBE alumni** — Connect with more than 11,400 tech and business leaders shaping the future through a unique trusted-based network\n\n### Are you an AWS customer?  Support SiliconANGLE financially by buying your AWS services from our Marketplace portal page and links: [https://siliconangle.com/aws-marketplace/](https://siliconangle.com/aws-marketplace/)\n\n##### **About SiliconANGLE Media**\n\n[SiliconANGLE](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fsiliconangle.com%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=SiliconANGLE&index=9&md5=646b1b564e2259100a2b8638aab0a552),\n\n[theCUBE Network](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fwww.thecube.net%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=theCUBE+Network&index=10&md5=7de2a85f95ab4a4a495cede20b8cb1da),\n\n[theCUBE Research](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fthecuberesearch.com%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=theCUBE+Research&index=11&md5=7bb33676722925eb57d588ec343e4f6f),\n\n[CUBE365](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fwww.cube365.net%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=CUBE365&index=12&md5=d310fb35919714e66ad8d42c9c0c1bc6),\n\n[theCUBE AI](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fwww.thecubeai.com%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=theCUBE+AI&index=13&md5=b8b98472f8071b23ebb10ab9a8dd0683)and theCUBE SuperStudios — with flagship locations in Silicon Valley and the New York Stock Exchange — SiliconANGLE Media operates at the intersection of media, technology and AI.\n\nFounded by tech visionaries John Furrier and Dave Vellante, SiliconANGLE Media has built a dynamic ecosystem of industry-leading digital media brands that reach 15+ million elite tech professionals. Our new proprietary theCUBE AI Video Cloud is breaking ground in audience interaction, leveraging theCUBEai.com neural network to help technology companies make data-driven decisions and stay at the forefront of industry conversations.", "url": "https://wpnews.pro/news/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work", "canonical_source": "https://siliconangle.com/2026/10/15/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work/", "published_at": "2026-10-15 22:20:54+00:00", "updated_at": "2026-10-15 23:01:18.328294+00:00", "lang": "en", "topics": ["large-language-models", "ai-agents", "ai-products", "artificial-intelligence", "ai-tools"], "entities": ["Meta Platforms Inc.", "Muse Spark Open", "Muse Spark 1.2", "Hugging Face Inc.", "Thinking Machines Lab Inc.", "Inkling", "Nvidia Corp.", "Muse Model License"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work", "markdown": "https://wpnews.pro/news/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work.md", "text": "https://wpnews.pro/news/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work.txt", "jsonld": "https://wpnews.pro/news/meta-releases-816b-parameter-muse-spark-open-for-coding-and-agent-work.jsonld"}}