Meta Releases 816B-Parameter Open-Weight Model With 1M Context Window

Meta has released the weights for Muse Spark Open, an 816-billion-parameter open-weight model built for coding, software engineering and multi-step reasoning. The model has 42 billion active parameters and a context window of one million tokens. The company said the model is available through inference platforms including Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI.