Muse Spark Open
An 816B-total, 42B-active multimodal model with a million-token context, released as downloadable weights under the Muse Model License for hosted or self-run agentic coding and tool use. Significant accelerator memory remains necessary.
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Why this model scores 83.5
Broad coding, tool-use and computer-use results support capability 87 and autonomy 85. Downloadable weights plus hosted and MLX options support deployment 90. Dual-use cyber breadth supports misuse 78 despite measured refusals. Control difficulty 76 reflects removable downstream safeguards and limited evaluation coverage; strong vendor safety scores do not cover arbitrary modifications.
News tied to Muse Spark Open
The model score of 83.5 rates this model's risk profile. The overall Doom Index of 69.0 measures the complete temporally weighted evidence record. These values answer different questions.
Each article's current Doom Index contribution is divided equally among the exact models named on that article. This prevents multi-model evidence from being claimed in full on several model pages. Model risk scores use a bounded temporal offset around their technical profile, but never feed back into the overall index.
Meta releases Muse Spark Open weights for agentic coding and multimodal work
Meta released Muse Spark Open, an 816B-total, 42B-active model with a million-token context under its Muse Model License. It supports hosted and self-run deployment, including a demonstrated two-Mac-Studio MLX setup. Its coding and computer-use results are vendor-reported; open weights do not make the model small or unrestricted by license.
- Full item contribution
- +0.09
- Muse Spark Open equal share
- +0.09
Model score history
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R1
Doom Score 83.5
Backfilled the dated October 15 open-weight release and exact card, distinguishing it from hosted Spark 1.3.
30 Oct 2026