Model comparison
Claude Sonnet 4.5 vs Muse Glimmer
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 41.7 on the Noometry Index.
Last verified . 15 shared benchmarks.
MetaSummary
- They share 15 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 7 categories and Muse Glimmer in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 38.5.
- Muse Glimmer has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 4.5 | Muse Glimmer | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 44.1 | 41.7 |
| Released | 2025-09-29 | 2026-08-10 |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 73 | 15 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.3 (#61), Muse Glimmer: 40.4 (#142)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena WebDev | 1393 | 1355 |
| SciCode | 44.7% | 44.9% |
| LMArena Coding | 1489 | 1416 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| SWE-bench Multilingual | 67% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.3 (#32), Muse Glimmer: —
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 26.9 (#125), Muse Glimmer: 25.7 (#144)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| CritPt | 1.1% | 2.6% |
| LMArena Hard Prompts | 1462 | 1396 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | 37.3% | — |
| ARC-AGI-1 | 63.7% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 83.2% | — |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
Math Muse Glimmer leads
Claude Sonnet 4.5: 32.3 (#216), Muse Glimmer: 38.8 (#125)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena Math | 1449 | 1417 |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 48.4 (#76), Muse Glimmer: 38.5 (#143)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena Expert | 1482 | 1386 |
| GPQA Diamond | 82.3% | — |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Not comparable
Claude Sonnet 4.5: 34.8 (#89), Muse Glimmer: —
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 53.4 (#69), Muse Glimmer: 50.5 (#122)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena Non-English | 1425 | 1384 |
| LMArena Chinese | 1459 | 1412 |
| LMArena Russian | 1437 | 1390 |
| LMArena French | 1458 | — |
| LMArena German | 1427 | — |
| LMArena Japanese | 1390 | — |
| LMArena Korean | 1403 | — |
| LMArena Spanish | 1457 | — |
Instruction Following Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 75.0 (#78), Muse Glimmer: 72.6 (#135)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena Instruction Following | 1459 | 1375 |
| IFEval | 85% | — |
Long Context Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 45.2 (#46), Muse Glimmer: 42.1 (#129)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena Longer Query | 1476 | 1382 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.5 (#34), Muse Glimmer: 57.5 (#126)
| Benchmark | Claude Sonnet 4.5 | Muse Glimmer |
|---|---|---|
| LMArena Text | 1439 | 1389 |
| LMArena Creative Writing | 1442 | 1339 |
| LMArena Multi-Turn | 1465 | 1399 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Muse Glimmer?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 41.7 on the Noometry Index.
Is Claude Sonnet 4.5 or Muse Glimmer better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 versus 40.4 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4.5 and Muse Glimmer share?
15 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Muse Glimmer has 15.