Meta Launches Muse Spark: First Closed-Source Model from Meta Superintelligence Labs, Departing Open-Source Strategy

Meta AI / r/LocalLLaMA (193↑, 73cmts) / r/singularity (677↑, 153cmts)·high signal

Meta released Muse Spark, the first model from Meta Superintelligence Labs under Alexandr Wang, and notably it is closed-source — a major departure from Meta's open-source Llama strategy. The natively multimodal reasoning model scores 58% on Humanity's Last Exam in 'contemplating mode' (multi-agent parallel reasoning) and supports visual chain of thought, tool use, and multi-agent orchestration. Available only through meta.ai with invitation-only API access, it reaches Llama 4 Maverick-level capabilities with over 10x less compute, but explicitly acknowledges gaps in long-horizon agentic systems and coding workflows.