Partially Verified70% confidenceFactExact time
Muse Spark Open is positioned as the most powerful open-weight model in the United States to date.
4
Sources
70%
Confidence
Medium-term (~90 days)
Relevance
10/15/2026
First Seen
Valid until: 1/13/2027
Sources
Related Entities
Related Claims
UnverifiedMuse Spark Open leads existing open-source models in the MCP-Atlas evaluation.80% similarPartially VerifiedMuse Spark Open supports a 1 million token context window.80% similarPartially VerifiedMeta released the open weights of Muse Spark Open on October 15, calling it officially the strongest US open-weight model to date.78% similarUnverifiedThe Muse Spark Open model weights are already available on the Hugging Face platform.71% similarVerifiedMuse Spark can be used as a backend via OpenCode Go.70% similar
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