Meta’s Muse Spark Open (Max) tops US open models in Code Arena WebDev

Meta Superintelligence Labs released an 816 billion parameter open-weight model that runs on two Mac Studios and scored 1511 points on Arena's web development leaderboard Meta has an open-weight model back near the top of a leaderboard. Muse Spark Open (Max) scored 1511 points in Arena’s Code Arena: WebDev rankings, making it the highest-ranked US open model on that board. That qualifier, “US,” is doing a lot of work. The model leads among American open releases. Global open-model rankings are a more crowded and more complicated story. Meta Superintelligence Labs introduced Muse Spark Open on October 15, 2026. The lab is billing it as the most capable US open-weight model released so far. The headline spec is size.

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