Model comparison
Claude Opus 5.5 vs Muse Glimmer
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 41.3 on the Noometry Index.
Last verified . 12 shared benchmarks.
MetaSummary
- They share 12 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 math, where Claude Opus 5.5 leads 92.4 to 36.1.
- Muse Glimmer has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 5.5 | Muse Glimmer | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 68.5 | 41.3 |
| Released | 2026-09-22 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $4 | — |
| Output $ / M tokens | $20 | — |
| Results tracked | 35 | 13 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Opus 5.5: 71.4 (#1), Muse Glimmer: 38.7 (#157)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena WebDev | 1820 | 1355 |
| LMArena Coding | 1545 | 1417 |
| FrontierCode | 54.4% | — |
| CursorBench | 57.8% | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| MirrorCode | 77.4% | — |
Agentic & Tool Use Not comparable
Claude Opus 5.5: 45.3 (#13), Muse Glimmer: —
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |
Reasoning Claude Opus 5.5 leads
Claude Opus 5.5: 79.5 (#2), Muse Glimmer: 27.2 (#111)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena Hard Prompts | 1545 | 1395 |
| ARC-AGI-2 | 92.5% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LMCA | 68.2% | — |
Math Claude Opus 5.5 leads
Claude Opus 5.5: 92.4 (#2), Muse Glimmer: 36.1 (#128)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | — | 1419 |
Knowledge Claude Opus 5.5 leads
Claude Opus 5.5: 66.6 (#9), Muse Glimmer: 37.9 (#140)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena Expert | 1564 | 1388 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |
Multimodal Not comparable
Claude Opus 5.5: 56.5 (#2), Muse Glimmer: —
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| Furniture Assembly | 83.3% | — |
Multilingual Claude Opus 5.5 leads
Claude Opus 5.5: 59.8 (#1), Muse Glimmer: 50.6 (#117)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena Non-English | 1513 | 1384 |
| LMArena Chinese | 1572 | 1412 |
| LMArena Russian | 1532 | 1393 |
Instruction Following Claude Opus 5.5 leads
Claude Opus 5.5: 80.1 (#2), Muse Glimmer: 72.7 (#134)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena Instruction Following | 1535 | 1374 |
Long Context Claude Opus 5.5 leads
Claude Opus 5.5: 47.3 (#18), Muse Glimmer: 42.1 (#124)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena Longer Query | 1540 | 1381 |
Writing & Preference Claude Opus 5.5 leads
Claude Opus 5.5: 78.7 (#3), Muse Glimmer: 57.7 (#122)
| Benchmark | Claude Opus 5.5 | Muse Glimmer |
|---|---|---|
| LMArena Text | 1518 | 1389 |
| LMArena Creative Writing | 1538 | 1338 |
| LMArena Multi-Turn | 1520 | 1398 |
| EQ-Bench Creative Writing | 2050 | — |
Frequently asked questions
Is Claude Opus 5.5 better than Muse Glimmer?
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 41.3 on the Noometry Index.
Is Claude Opus 5.5 or Muse Glimmer better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 38.7 in the Noometry coding category.
How many benchmarks do Claude Opus 5.5 and Muse Glimmer share?
12 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Muse Glimmer has 13.