Noometry

Model comparison

Claude Opus 5.5 vs Muse Glimmer

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 41.7 on the Noometry Index.

Last verified . 15 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Muse Glimmer Meta

41.7

Rank #131 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Muse Glimmer in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 25.7.
  • The biggest single-benchmark swing is CritPt: 31.7% for Claude Opus 5.5 and 2.6% for Muse Glimmer.
  • Muse Glimmer has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Muse Glimmer
ProviderAnthropicMeta
Noometry Index68.641.7
Released2026-09-222026-08-10
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked4415

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Muse Glimmer: 40.4 (#142)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena WebDev18131355
SciCode66.9%44.9%
LMArena Coding15471416
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Muse Glimmer: —

BenchmarkClaude Opus 5.5Muse Glimmer
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Muse Glimmer: 25.7 (#144)

BenchmarkClaude Opus 5.5Muse Glimmer
CritPt31.7%2.6%
LMArena Hard Prompts15351396
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Muse Glimmer: 38.8 (#125)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Math15061417
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Muse Glimmer: 38.5 (#143)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Expert15471386
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Muse Glimmer: —

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Muse Glimmer: 50.5 (#122)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Non-English15071384
LMArena Chinese15881412
LMArena Russian15201390
LMArena French1514—
LMArena Spanish1507—

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Muse Glimmer: 72.6 (#135)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Instruction Following15371375

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Muse Glimmer: 42.1 (#129)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Longer Query15321382

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Muse Glimmer: 57.5 (#126)

BenchmarkClaude Opus 5.5Muse Glimmer
LMArena Text15151389
LMArena Creative Writing15331339
LMArena Multi-Turn14991399
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Muse Glimmer?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 41.7 on the Noometry Index.

Is Claude Opus 5.5 or Muse Glimmer better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 40.4 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and Muse Glimmer share?

15 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Muse Glimmer has 15.

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