SAN FRANCISCO, United States: Meta has released a new open-weight artificial intelligence model, claiming performance levels that compete directly with leading systems developed in China.
The release of Muse Spark Open follows two years of expanding dominance by Chinese developers, including Alibaba and Moonshot AI, in the open-weight AI sector.
Today we’re releasing Muse Spark Open, the most capable US open-weight model to date.
Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning.
Key Model Specs:
→ 816B total / 42B active parameters
→ 1M token context window
→ Natively multimodal across text, image, video, audio— AI at Meta (@AIatMeta) October 15, 2026
Software engineering and local hardware
Meta chief of AI Alexandr Wang confirmed on social media that Muse Spark Open represents the company’s most capable open-weight architecture. Unlike proprietary models, open-weight software allows external developers to download, modify, and fine-tune underlying parameters.
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According to company disclosures, the system focuses on complex coding tasks, multi-step reasoning, and long-duration software execution.
Meta also confirmed collaboration with Apple, optimising the software to run on desktop setups equipped with Apple’s M5 Ultra processor.
Shifting market strategy
The launch comes shortly after Meta introduced two proprietary closed models, Wonder and Wonder Full.
Chief Executive Mark Zuckerberg has expanded Meta’s product range to compete with proprietary systems from OpenAI and Anthropic alongside its open-source developments.
