From the source
Meta Platforms Inc. today released open weights for its Muse Spark artificial intelligence model, which had been proprietary since its April debut .
The release, called Muse Spark Open, is built for coding and long-running agent work.
Meta describes it as the most capable open-weight model to come out of a U.S. lab so far.
Only 42 billion of the model’s 816 billion parameters switch on for any given token.
Prompts can mix text with images, audio or video, and Meta has set the context window at up to 1 million tokens.
The starting point was Muse Spark 1.2, shipped in August, and Meta then added safety post-training so the model holds up without the guardrails of Meta’s own services.
Meta said Muse Spark Open cleared the release thresholds in its Meta Superintelligence Scaling Framework, with a full evaluation report still to come.
A technical writeup from Hugging Face Inc. says training leaned on what Meta calls “real developer workflows,” including multi-file refactors and long debugging sessions.
Meta also tested the model away from the data center, on a pair of Apple Inc.
Mac Studio desktops with M5 Ultra chips that Apple’s MLX framework linked into one system.
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