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Muse Spark

muse family · launched 2026-10-15

MultimodalReasoningToolsStructuredOpen weights
AITopic score64.7#43 overall

Muse Spark Open is an 816B total / 42B active open-weight multimodal reasoning model from Meta for coding and long-horizon agentic work, with 1M-token context.

Evidence coverage5%1 evaluations · 1 institutions
Context / maximum output1M / 1Mtokens
Cache / input / output$0.15 · $1.25 · $4.25USD per million tokens
Value / freshness59.4 / 100relative value · release freshness
Product profile

What this model supports

Inputtext, image, video
Outputtext
Knowledge cutoff2026-01-04
WeightsOpen weights
Capability profile

Strengths by domain

Coding—0 public results
Research & reasoning—0 public results
Professional work—0 public results
Knowledge & instruction—0 public results
Behind the score

Every result has a source

Raw results and standardized readings are shown together. Missing tests add neither points nor penalties.

Human preference & indices2 results

AA IndexArtificial Analysis67.11 indexReading 64.7

Imported from Artificial Analysis. The published 0–100 score is used directly; it is not z-score normalized.

Configuration: Muse SparkOpen evidence
Arena TextLMArena1,474.0 EloReading 64.7

Direct LMArena text leaderboard result.

Open evidence
Same builder

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