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Muse Spark 1.1

Meta CLOSED Proprietary
Verdict

Muse Spark 1.1 is a solid mid-pack model: #82 of 406 by SIscope score. Strongest at chat quality, weaker at agents & tools. Mid-range on price.

SIscope score
70
#82 of 406
Human-vote rank
#23
of 419 · score 1478
Price per 1M tokens, blended
$2
$1.25 in · $4.25 out
Context window
1M
1,048,576 tokens

Shape

Each spoke is a category, 0 at the centre, 100 at the edge.

CodingAgentsReasoningMathChatInstructions

Category scores

Percentiles: 90 means better than about 90% of tested models.

Coding81
Agents & tools18
Reasoning & knowledge89
Math92
Chat quality95
Following instructions89

What goes into each category · Compare with DeepSeek V4.1 Flash

Human-vote score over time

Text arena, recent updates.

147014781485Oct 15: 1478.1 (rank #22)Oct 20: 1478.3 (rank #22)Oct 22: 1477.9 (rank #22)Oct 28: 1478.3 (rank #23)Oct 15Oct 28

Coding votes over time

WebDev arena, recent updates.

153515431550Oct 16: 1542.5 (rank #42)Oct 18: 1542.6 (rank #43)Oct 19: 1542.4 (rank #46)Oct 22: 1542.6 (rank #46)Oct 23: 1542.5 (rank #47)Oct 27: 1542.4 (rank #48)Oct 28: 1542.5 (rank #49)Oct 16Oct 28

Independent test runs

Run by Epoch AI on the same harness for every model. Bars show the share of questions answered correctly.

SimpleQA Verified58%
Short factual questions; rewards not making things up
Better than 83% of 100 tested models. Run Aug 31, 2026.

Human-vote arenas

People compare two anonymous answers and pick the better one. Scores work like chess ratings.

ArenaRankScoreRange (95%)VotesUpdated
Text arena
Everyday chat, blind human votes
#23 of 41914781474–148246,354Oct 28, 2026
WebDev arena
Building web apps, blind human votes
#49 of 15215431535–15507,935Oct 28, 2026
Vision arena
Questions about images, blind human votes
#26 of 16712931286–129912,804Oct 19, 2026
Agent arena
Real multi-step agent sessions
#47 of 57-7.7%-8.3–-7.0%150,517Nov 2, 2026

Source: Arena (formerly LMArena) leaderboard dataset, CC BY 4.0. Fetched Nov 4, 2026.

Price

Input
$1.25
per 1M tokens
Output
$4.25
per 1M tokens
Blended
$2
3 in : 1 out, per 1M
Context window
1M
max tokens per request
Speed
Coming soon
our own tests

List price from the OpenRouter models API (meta/muse-spark-1.1), Nov 4, 2026. Providers can charge differently.