Meta gave away a model you can run on a desk, and the bond market rallied straight through the hottest wholesale inflation in four years.
Meta just handed builders a top AI model they can own instead of rent
On Thursday, Meta released Muse Spark Open, an AI model anyone can download, run and change. Meta calls it the most capable open-weight model from an American lab, built for coding and agents. It's also a U-turn: when Muse Spark launched in April, Meta kept it closed.
"Open weights" means you get the model itself, not a login to someone else's server. This one is huge, about 816 billion parameters, the dials it learned in training. But it only wakes up about 42 billion for each word it writes, which makes it practical. Meta worked with Apple so it runs on two linked Mac Studios, and it's live on hosts like Groq and OpenRouter.
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