Meta has released Muse Spark Open, an 816B-total/42B-active Mixture-of-Experts model with a 1 million token context window. This model accepts text, image, video, and audio inputs, and is designed for coding, long-horizon agents, and multi-step reasoning. While it leads among US open-weight models on some benchmarks, it lags behind competitors like GLM 5.3 and Kimi K3 in agentic evaluations. The model's custom license requires attribution and a separate agreement for certain commercial uses. AI
IMPACT Sets a new benchmark for open-weight models in context window length and multi-modal input, potentially influencing future agent development.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
- Artificial Analysis
- GLM 5.3
- Goodfire
- Kimi K3
- Meta
- Muse Model License
- Muse Spark Open
- Nick Cammarata
- Spark 1.3
- Tesla Roadster
- vLLM
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