Meta
Meta: Muse Spark Open
meta/muse-spark-open
Muse Spark Open is a coding-optimized open-weight model. Trained specifically for agentic coding workflows, it delivers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across the repos developers actually work in.
Input
$1.25
/ 1M tokens
Output
$4.25
/ 1M tokens
Context window
1.05M
tokens
Limits
Context
1,048,576
tokens
Max output
943,718
90% of the context window
Parameters
822,036,529,664
Model facts
Author
Meta
Tokenizer
Other
Modality
Text + Image + File + Audio + Video -> Text
License
Other
Created
Oct 15, 2026
Hugging Face
meta-models/Muse-Spark-Open-816B-A42B
Reasoning
RequiredDefault MediumXhighHighMediumLow
Publication status
Hugging Face: verifiedLicense: publishedParameter count: published
Modalities
Input · TextInput · ImageInput · VideoInput · FileInput · AudioOutput · Text
Generation controls
Frequency penaltyInclude reasoningLogit biasLogprobsMax tokensMin pPresence penaltyReasoningReasoning effortRepetition penaltyResponse formatSeedStopStructured outputsTemperatureTool choiceToolsTop kTop logprobsTop p