New model2026-10-15via Product HuntChat Assistants

Muse Spark Open

Name: Muse Spark Open
Author: Meta Superintelligence Labs

Muse Spark Open is Meta's open-weights release of Muse Spark: an 816B-parameter (42B active) multimodal model with a 1M-token context, built for coding and agentic work.

Visit Muse Spark Open ↗

Open weights (free)Muse Model License: permissive, but requires "Built with Muse Spark Open" attribution, and Model-as-a-Service providers over $20M revenue need a separate agreementModelby Meta Superintelligence Labs

Why it matters

Meta's open-weights release of Muse Spark, a very large multimodal model for coding and agentic work with a 1M-token context. It's for teams that want frontier-class open weights and have the hardware to run them, or a provider that does.

Highlights

816B total / 42B active parameter mixture-of-experts with a Perception Encoder; 1M-token context at inference.
Input: text, image, video and audio; output: text. Trained on data from more than 100 languages.
Meta-reported scores include Terminal-Bench 2.1 76.4, GPQA Diamond 89.0 and OSWorld Verified 80.4 at xhigh reasoning effort.
Self-hosting needs at least 700 GB VRAM (NVFP4) or 2 TB (BF16). Supported frameworks are SGLang, vLLM, Transformers, TensorRT-LLM, Unsloth and Llama.cpp, plus MLX on two M5 Ultra Mac Studios.
Has extra safety post-training for standalone use; Meta recommends deploying it with additional system guardrails.

Taken from the project's own README, docs or launch page. Claims about speed or accuracy are the maker's unless stated otherwise.

Try it if: You need a top open-weights model for agents or coding and can host it, or can use a provider that does.

Worth knowing: Not intended for users under 18 per the license. Benchmarks are Meta's own.

Quick facts

Pricing	Weights free (gated access on Hugging Face); API through third-party inference providers (prices not checked)not verified
Free or paid	Open weights (free)
License	Muse Model License: permissive, but requires "Built with Muse Spark Open" attribution, and Model-as-a-Service providers over $20M revenue need a separate agreement
Language	Model
Platform	Self-host or third-party API (Baseten listed on Hugging Face)
GitHub stars	n/a (not a GitHub project)
Maker	Meta Superintelligence Labs

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What we couldn't verify

quick_facts.pricing (third-party API)

Checked 2026-10-17 from the model's own pages. Prices and star counts change, so confirm on the official site. Listing here is not a ranking or an endorsement.