# Meta launches Muse Spark Open, an 816B-parameter coding model trained on NVIDIA GB300 NVL72 systems

Canonical page: https://technooptimist.io/stories/meta-launches-muse-spark-open-an-816b-parameter-coding-model-trained-on-1920a694
Date: 15 Oct 2026
About: [Meta](https://technooptimist.io/companies/meta.md) · [Muse models](https://technooptimist.io/ai/muse.md)
Original source: https://developer.nvidia.com/blog/scale-agentic-coding-workflows-with-metas-muse-spark-open-on-nvidia-gb300-nvl72/

Meta launched Muse Spark Open on October 15, 2026, a coding-optimised mixture-of-experts model. NVIDIA's technical blog says Meta trained it on GB300 NVL72 Blackwell Ultra systems for agentic coding, and it ships as NVFP4 weights on Hugging Face and as a downloadable NVIDIA NIM.

## Key facts

- 816B total parameters with 42B active per token, top-8 routing across 256 experts, and a 1M-token context window.
- Agent features include web search, subagent coordination, and computer use across desktop, mobile and browser.
- NVIDIA's vendor figures: over 50K tokens per second per GPU and over 600 tokens per user, in a test on four Blackwell GPUs with speculative decoding.
- Supported on the SGLang, vLLM and TensorRT-LLM inference stacks; fine-tuning runs through NVIDIA NeMo AutoModel and Megatron Bridge.

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