Meta Launches Muse Spark Open: 816 Billion Parameter Open AI Model
Meta AI has released Muse Spark Open, an open model with 816 billion parameters designed for coding and agent-based tasks that can be run locally on a Mac Studio.
What happened?
On 15 October 2026, Meta AI Research launched the open model Muse Spark Open. The model contains a total of 816 billion parameters with 42 billion active parameters and a context window of 1 million tokens. Muse Spark Open is developed for coding and agent-based workflows and can be run locally on two Apple Mac Studio units equipped with M5 Ultra chips via the MLX framework.
Key facts
| Lanseringsdatum | 15 oktober 2026 |
|---|---|
| Totala parametrar | 816 miljarder |
| Aktiva parametrar | 42 miljarder |
| Kontextfönster | 1 miljon tokens |
| Hårdvarukrav skrivbord | 2 st Apple M5 Ultra Mac Studio |
”We believe the future is for everyone, and that includes the freedom to run advanced models wherever, including at home.”
”Muse Spark Open is the first model in its class to run on your desktop using two Apple M5 Ultra Mac Studios with the latest MLX framework.”
Why it matters
The launch marks a technical milestone for open AI models developed in the US. By enabling the local operation of an 800-billion-parameter-class model on two linked Mac Studio computers, the accessibility of advanced agent and coding tools is expanded beyond datacenter clusters.
Who is affected?
The model is targeted at software developers, AI researchers, and organizations building autonomous agents. It is particularly relevant for teams looking to run advanced language models locally on high-performance desktop hardware without relying on cloud-based solutions.
Impact on the EU
As the model is released with open weights, developers and organizations within the EU can download and run it locally. The source material does not specify any separate regulatory restrictions for the European market.
What else you should know
The model utilizes a sparse Mixture-of-Experts (MoE) architecture, where only 42 billion of the total 816 billion parameters are activated per token. The source material ends abruptly at the mention of API availability.
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