Open-weight release

The model, designated Muse Spark Open, carries 816 billion parameters and is being distributed under an open-weight approach, meaning the trained model weights are made publicly available rather than kept closed. Meta published the announcement, along with a benchmark scorecard and supporting images, on its research portal at research.meta.ai.

Benchmarks published

Alongside the release, Meta posted a benchmark scorecard detailing the model's evaluation results. The company also released social media materials describing the model as Muse Spark 1.2 Open Weights, indicating the release corresponds to version 1.2 of the Muse Spark lineup.

What remains unclear

The available announcement materials do not specify the license terms governing commercial use, the hardware requirements for running the model, or the training data composition. Those details have not been confirmed in the published materials reviewed so far, and Meta's research article should be consulted for the full technical specifications.

The claim that Meta has publicly released an 816-billion-parameter open-weight AI model named Muse Spark Open is True.