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Muse Spark Open

Meta

An open-weight, natively multimodal model for coding, long-horizon agentic work, and complex software engineering.

View on models.dev

Specs

Model

Family
Muse Spark
Parameters
816B total / 42B active (MoE)
Weights
Open
License
Muse Model License

Limits

Context
1,048,576 tokens
Max output
943,718 tokens

Modalities

Input
Text Image Video PDF Audio
Output
Text

Pricing

Input
$1.25 / 1M
Output
$4.25 / 1M
Cache read
$0.15 / 1M

Capabilities

Reasoning
Yes
Reasoning control
Effort levels
Tool calling
Yes
Attachments
Yes

Dates

Announced
15 Oct 2026
Released
15 Oct 2026
Knowledge cutoff
4 Jan 2026

Articles

All articles

Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date

Muse Spark Open is the most capable US open-weight model to date, and brings leading agentic capabilities to your desktop on Apple M5 Ultra Mac Studios.

Meta Superintelligence Labs
research.meta.ai

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