Model comparison
Claude Opus 4 vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 43.1 on the Noometry Index.
Last verified . 22 shared benchmarks.
MetaSummary
- They share 22 benchmarks with published results for both. Claude Opus 4 scores higher in 2 categories and Muse Spark 1.2 in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 27.3.
- The biggest single-benchmark swing is CritPt: 0.3% for Claude Opus 4 and 17.7% for Muse Spark 1.2.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $15 / $75 for Claude Opus 4.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 200K.
Side by side
| Claude Opus 4 | Muse Spark 1.2 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 43.1 | 50.3 |
| Released | 2025-05-22 | 2026-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 1.05M |
| Max output | 32K | 131K |
| Input $ / M tokens | $15 | $1.25 |
| Output $ / M tokens | $75 | $4.25 |
| Results tracked | 56 | 31 |
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Category by category
Coding Muse Spark 1.2 leads
Claude Opus 4: 47.2 (#62), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| WeirdML | 43.7% | 60.3% |
| LMArena Coding | 1442 | 1495 |
| SWE-bench Verified | 70.7% | — |
| DeepSWE | — | 54.9% |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| LMArena WebDev | — | 1533 |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| GSO | 6.9% | — |
| AlgoTune | 1.33 | — |
Agentic & Tool Use Claude Opus 4 leads
Claude Opus 4: 34.8 (#42), Muse Spark 1.2: 29.4 (#87)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| Cybench | 38% | — |
| DeepResearch Bench | 46.8% | — |
| GDP.pdf | — | 16% |
| LMArena Search | 1127 | — |
| METR Time Horizons | 63.9% | — |
Reasoning Muse Spark 1.2 leads
Claude Opus 4: 27.3 (#121), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | 58.8% | 74.5% |
| CritPt | 0.3% | 17.7% |
| LMArena Hard Prompts | 1399 | 1486 |
| DTBench | 81.6% | 94.7% |
| LMCA | 37.4% | 48.4% |
| Epoch Capabilities Index | 142.67 | 154.87 |
| ARC-AGI-2 | 8.6% | — |
| Kagi LLM Benchmark | 74.3% | — |
| NYT Connections (extended) | — | 79.2% |
| ARC-AGI-1 | 35.7% | — |
| EnigmaEval | 5.6% | — |
| ForecastBench | 61.1 | — |
Math Muse Spark 1.2 leads
Claude Opus 4: 42.0 (#86), Muse Spark 1.2: 46.4 (#70)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Math | 1390 | 1471 |
| OTIS Mock AIME 2024-2025 | 64.4% | — |
| ProofBench | — | 43% |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Muse Spark 1.2 leads
Claude Opus 4: 44.0 (#88), Muse Spark 1.2: 54.1 (#53)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Expert | 1386 | 1480 |
| GPQA Diamond | 76.3% | — |
| Humanity's Last Exam | 10.7% | — |
| SimpleQA Verified | — | 60.3% |
| MMLU-Pro | 87.5% | — |
| Confabulations | 15.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |
Multimodal Muse Spark 1.2 leads
Claude Opus 4: 31.5 (#106), Muse Spark 1.2: 43.4 (#25)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1192 | 1305 |
| GeoBench | 49% | — |
| VPCT | 38% | — |
Multilingual Muse Spark 1.2 leads
Claude Opus 4: 48.8 (#138), Muse Spark 1.2: 57.1 (#11)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1362 | 1478 |
| LMArena Chinese | 1386 | 1511 |
| LMArena French | 1372 | 1513 |
| LMArena Russian | 1392 | 1487 |
| LMArena Spanish | 1389 | 1498 |
| LMArena German | 1391 | — |
| LMArena Japanese | 1331 | — |
| LMArena Korean | 1321 | — |
Instruction Following Too close to call
Claude Opus 4: 77.1 (#28), Muse Spark 1.2: 76.7 (#36)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1461 |
| IFEval | 91.8% | — |
Long Context Muse Spark 1.2 leads
Claude Opus 4: 39.6 (#172), Muse Spark 1.2: 45.2 (#48)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1422 | 1475 |
| Fiction.LiveBench | 61.1% | — |
Writing & Preference Muse Spark 1.2 leads
Claude Opus 4: 61.2 (#89), Muse Spark 1.2: 72.3 (#14)
| Benchmark | Claude Opus 4 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1377 | 1482 |
| LMArena Creative Writing | 1387 | 1449 |
| EQ-Bench Creative Writing | 1580 | 1840 |
| LMArena Multi-Turn | 1396 | 1494 |
| Short-Story Creative Writing | 83.6% | — |
| WildBench | 85.2% | — |
Frequently asked questions
Is Claude Opus 4 better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 43.1 on the Noometry Index.
Which is cheaper, Claude Opus 4 or Muse Spark 1.2?
Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; Claude Opus 4 lists at $15 and $75.
Is Claude Opus 4 or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 47.2 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 200K.
How many benchmarks do Claude Opus 4 and Muse Spark 1.2 share?
22 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Muse Spark 1.2 has 31.