Model comparison
Claude Opus 4.5 vs Muse Spark
Claude Opus 4.5 and Muse Spark score almost the same on the Noometry Index (50.5 vs 50.6), so choose on price, context window or the category you care about most.
Last verified . 24 shared benchmarks.
MetaSummary
- They share 24 benchmarks with published results for both. Claude Opus 4.5 scores higher in 5 categories and Muse Spark in 4 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in multimodal, where Muse Spark leads 43.4 to 31.4.
- The biggest single-benchmark swing is ProofBench: 36% for Claude Opus 4.5 and 17% for Muse Spark.
Side by side
| Claude Opus 4.5 | Muse Spark | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 50.5 | 50.6 |
| Released | 2025-11-01 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $5 | — |
| Output $ / M tokens | $25 | — |
| Results tracked | 69 | 27 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.5: 54.8 (#27), Muse Spark: 46.2 (#69)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Coding | 1504 | 1481 |
| SWE-bench Verified | 76.7% | — |
| SWE-bench Verified (bash only) | 76.8% | — |
| LMArena WebDev | 1494 | — |
| SWE-bench Multilingual | 70.7% | — |
| SciCode | — | 51.5% |
| GSO | 26.5% | — |
| WeirdML | 63.7% | — |
| ALE-Bench | 1,025 | — |
| AlgoTune | 1.77 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.5: 47.3 (#12), Muse Spark: —
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| Terminal-Bench | 63.1% | — |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Banking | 24.7% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |
Reasoning Claude Opus 4.5 leads
Claude Opus 4.5: 42.6 (#51), Muse Spark: 35.9 (#67)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1476 | 1474 |
| Epoch Capabilities Index | 150.09 | 152.04 |
| ARC-AGI-2 | 37.6% | — |
| SimpleBench | 62% | — |
| Kagi LLM Benchmark | 80.2% | — |
| NYT Connections (extended) | 52.5% | — |
| ARC-AGI-1 | 80% | — |
| CritPt | — | 11.3% |
| Chess Puzzles | 12% | — |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 22% | — |
| DTBench | 89.9% | — |
| LMCA | 44.5% | — |
| ForecastBench | 60.7 | — |
Math Muse Spark leads
Claude Opus 4.5: 38.6 (#132), Muse Spark: 47.8 (#66)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.1% | 88.9% |
| ProofBench | 36% | 17% |
| LMArena Math | 1463 | 1455 |
| FrontierMath (Feb 2025 set) | 20.7% | 39% |
| FrontierMath Tier 4 (v1) | 4.2% | 14.6% |
| FrontierMath (Tiers 1-3) | 34.4% | — |
| FrontierMath Tier 4 | 4.9% | — |
Knowledge Muse Spark leads
Claude Opus 4.5: 56.5 (#44), Muse Spark: 65.7 (#13)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| GPQA Diamond | 86% | 89.8% |
| Humanity's Last Exam | 25.2% | 40.6% |
| LMArena Expert | 1487 | 1457 |
| SimpleQA Verified | 45.7% | — |
| Vectara Hallucination Rate | 10.9% | — |
Multimodal Muse Spark leads
Claude Opus 4.5: 31.4 (#107), Muse Spark: 43.4 (#24)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Document | 1462 | 1444 |
| LMArena Vision | — | 1306 |
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
Multilingual Muse Spark leads
Claude Opus 4.5: 54.3 (#47), Muse Spark: 56.1 (#24)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Non-English | 1438 | 1464 |
| LMArena Chinese | 1470 | 1509 |
| LMArena French | 1471 | 1497 |
| LMArena German | 1449 | 1497 |
| LMArena Korean | 1424 | 1459 |
| LMArena Russian | 1447 | 1466 |
| LMArena Spanish | 1458 | 1472 |
| LMArena Japanese | 1416 | — |
Instruction Following Claude Opus 4.5 leads
Claude Opus 4.5: 77.5 (#19), Muse Spark: 75.9 (#51)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1478 | 1442 |
Long Context Claude Opus 4.5 leads
Claude Opus 4.5: 46.5 (#22), Muse Spark: 44.4 (#69)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1480 | 1451 |
| CL-bench | 21.1% | — |
Writing & Preference Claude Opus 4.5 leads
Claude Opus 4.5: 68.1 (#28), Muse Spark: 66.0 (#39)
| Benchmark | Claude Opus 4.5 | Muse Spark |
|---|---|---|
| LMArena Text | 1451 | 1474 |
| LMArena Creative Writing | 1445 | 1459 |
| LMArena Multi-Turn | 1466 | 1477 |
| EQ-Bench Creative Writing | 1687 | — |
Frequently asked questions
Is Claude Opus 4.5 better than Muse Spark?
Claude Opus 4.5 and Muse Spark score almost the same on the Noometry Index (50.5 vs 50.6), so choose on price, context window or the category you care about most.
Is Claude Opus 4.5 or Muse Spark better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 46.2 in the Noometry coding category.
How many benchmarks do Claude Opus 4.5 and Muse Spark share?
24 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Muse Spark has 27.