Breaking2 min read
Meta Breaks From Open Source: Muse Spark Is Its First Frontier Model — and First Without Open Weights
Meta's Superintelligence Labs has released Muse Spark, a native multimodal reasoning model that scores 52 on the Artificial Analysis Intelligence Index and closes the frontier gap with Gemini, GPT-5, and Claude significantly. It is also Meta's first model released without open weights — a significant strategic reversal from the company that made open-source Llama the defining alternative to closed AI systems.