Meta launches Muse Spark Open with downloadable, modifiable weights
Meta has launched Muse Spark Open, an open-weight AI model built for coding and agentic work. Developers can download and modify its parameters, but running it requires significant computing power.

What changed
Meta released Muse Spark Open and says it excels at long-horizon tasks, complex software engineering and multi-step reasoning. The company says it has integrated safeguards and optimized the model for Apple’s M5 Ultra chips. Meta says users can run it on two Mac Studios equipped with those chips.
Why it may matter for your work
Downloadable weights could give development teams more control over how they adapt and run an AI model for coding work. Its computing requirements may make local use less practical for smaller teams without substantial hardware.
What it can actually do
Supports coding, agentic work, complex software engineering and multi-step reasoning, according to Meta. Its model parameters can be downloaded and modified.
Limits to check
Requires significant computing power; Meta describes running it on two Mac Studios with M5 Ultra chips. Performance and safeguard claims are attributed to Meta, with no independent evaluation provided on the page. Prices and licensing terms are not stated.
“Meta on Thursday launched a new open-weight AI model which it claims rivals, and in some cases outperforms, similar products from leading Chinese developers.”From the linked source page