Model comparison
Claude Opus 4.8 vs Muse Spark
Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 50.6 on the Noometry Index.
Last verified . 26 shared benchmarks.
MetaSummary
- They share 26 benchmarks with published results for both. Claude Opus 4.8 scores higher in 6 categories and Muse Spark in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.8 leads 78.4 to 47.8.
- The biggest single-benchmark swing is ProofBench: 69% for Claude Opus 4.8 and 17% for Muse Spark.
Side by side
| Claude Opus 4.8 | Muse Spark | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 60.7 | 50.6 |
| Released | 2026-05-28 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $5 | — |
| Output $ / M tokens | $25 | — |
| Results tracked | 65 | 27 |
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Category by category
Coding Claude Opus 4.8 leads
Claude Opus 4.8: 59.9 (#12), Muse Spark: 46.2 (#69)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| SciCode | 53.5% | 51.5% |
| LMArena Coding | 1490 | 1481 |
| DeepSWE | 59% | — |
| FrontierCode | 46.5% | — |
| LMArena WebDev | 1556 | — |
| GSO | 47.1% | — |
| WeirdML | 82.9% | — |
| ALE-Bench | 1,564 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.8: 47.6 (#11), Muse Spark: —
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| APEX-Agents | 48.9% | — |
| OSWorld 2.0 | 20.6% | — |
| Remote Labor Index | 8.3% | — |
| τ²-bench Banking | 39.7% | — |
| DeepResearch Bench | 50.2% | — |
| PostTrainBench | 33.8% | — |
| GBAEval | 70.9% | — |
| GDP.pdf | 24% | — |
| LMArena Search | 1204 | — |
| Vending-Bench 2 | 5,787 | — |
Reasoning Claude Opus 4.8 leads
Claude Opus 4.8: 64.7 (#16), Muse Spark: 35.9 (#67)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| CritPt | 20.9% | 11.3% |
| LMArena Hard Prompts | 1482 | 1474 |
| Epoch Capabilities Index | 158.21 | 152.04 |
| ARC-AGI-2 | 72.1% | — |
| SimpleBench | 64.8% | — |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 91.1% | — |
| ARC-AGI-1 | 92.5% | — |
| Chess Puzzles | 34% | — |
| EnigmaEval | 23.5% | — |
| EBR-Bench | 28.6% | — |
| Mystery Game Puzzles | 36% | — |
| DTBench | 94.9% | — |
| LMCA | 57.5% | — |
| Surface Evolver Bench | 87.5% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 59.9 | — |
Math Claude Opus 4.8 leads
Claude Opus 4.8: 78.4 (#13), Muse Spark: 47.8 (#66)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.3% | 88.9% |
| ProofBench | 69% | 17% |
| LMArena Math | 1487 | 1455 |
| FrontierMath (Feb 2025 set) | 47.2% | 39% |
| FrontierMath Tier 4 (v1) | 31.3% | 14.6% |
| FrontierMath (Tiers 1-3) | 80% | — |
| FrontierMath Tier 4 | 56.1% | — |
| MathArena Final-Answer Competitions | 91.8% | — |
Knowledge Muse Spark leads
Claude Opus 4.8: 61.3 (#29), Muse Spark: 65.7 (#13)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| GPQA Diamond | 91% | 89.8% |
| LMArena Expert | 1502 | 1457 |
| Humanity's Last Exam | — | 40.6% |
| SimpleQA Verified | 53% | — |
Multimodal Too close to call
Claude Opus 4.8: 42.9 (#26), Muse Spark: 43.4 (#24)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| LMArena Vision | 1294 | 1306 |
| LMArena Document | 1475 | 1444 |
| Blueprint-Bench 2 | 14.5% | — |
| Furniture Assembly | 42.5% | — |
Multilingual Too close to call
Claude Opus 4.8: 55.2 (#33), Muse Spark: 56.1 (#24)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| LMArena Non-English | 1450 | 1464 |
| LMArena Chinese | 1507 | 1509 |
| LMArena French | 1481 | 1497 |
| LMArena German | 1472 | 1497 |
| LMArena Korean | 1432 | 1459 |
| LMArena Russian | 1474 | 1466 |
| LMArena Spanish | 1466 | 1472 |
| LMArena Japanese | 1440 | — |
Instruction Following Claude Opus 4.8 leads
Claude Opus 4.8: 77.4 (#24), Muse Spark: 75.9 (#51)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1476 | 1442 |
Long Context Claude Opus 4.8 leads
Claude Opus 4.8: 45.4 (#35), Muse Spark: 44.4 (#69)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1483 | 1451 |
Writing & Preference Claude Opus 4.8 leads
Claude Opus 4.8: 72.0 (#16), Muse Spark: 66.0 (#39)
| Benchmark | Claude Opus 4.8 | Muse Spark |
|---|---|---|
| LMArena Text | 1461 | 1474 |
| LMArena Creative Writing | 1454 | 1459 |
| LMArena Multi-Turn | 1476 | 1477 |
| EQ-Bench Creative Writing | 1840 | — |
| EQ-Bench 4 | 1281 | — |
Frequently asked questions
Is Claude Opus 4.8 better than Muse Spark?
Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 50.6 on the Noometry Index.
Is Claude Opus 4.8 or Muse Spark better for coding?
Claude Opus 4.8 scores higher on coding benchmarks: 59.9 versus 46.2 in the Noometry coding category.
How many benchmarks do Claude Opus 4.8 and Muse Spark share?
26 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and Muse Spark has 27.