Fireworks AI says Meta’s Muse Spark Open is available through its serverless API on US-only capacity, with no US premium. The open-weights model has 816 billion total parameters, 42 billion active per token, and a 1-million-token context window.
Fireworks reports that the model ranked first on Vals AI’s Harvey Legal Agent Benchmark, scoring 25.4% across 75 models. The company also cites results from its own evaluations and other benchmarks; performance can depend on the test setup, and the post does not provide current API pricing.
Why it matters
US-based organizations considering open-weight models can access Muse Spark Open on Fireworks’ US-only serverless capacity, but they should check current pricing and evaluate it on their own workflows.
