Model comparison
Claude Opus 4.1 vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 41.0 on the Noometry Index.
Last verified . 20 shared benchmarks.
MetaSummary
- They share 20 benchmarks with published results for both. Claude Opus 4.1 scores higher in 1 category and Muse Spark 1.2 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.2 leads 46.4 to 22.3.
- The biggest single-benchmark swing is DTBench: 80% for Claude Opus 4.1 and 94.7% 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 4.1.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 200K.
Side by side
| Claude Opus 4.1 | Muse Spark 1.2 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 41.0 | 50.3 |
| Released | 2025-08-05 | 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 | 48 | 31 |
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Category by category
Coding Muse Spark 1.2 leads
Claude Opus 4.1: 44.4 (#73), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1390 | 1533 |
| WeirdML | 45.9% | 60.3% |
| LMArena Coding | 1479 | 1495 |
| SWE-bench Verified | 73.3% | — |
| DeepSWE | — | 54.9% |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| ALE-Bench | 674.77 | — |
| AlgoTune | 1.34 | — |
Agentic & Tool Use Claude Opus 4.1 leads
Claude Opus 4.1: 35.0 (#41), Muse Spark 1.2: 29.4 (#87)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| Terminal-Bench | 38% | — |
| APEX-Agents | — | 36.4% |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| GDP.pdf | — | 16% |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |
Reasoning Muse Spark 1.2 leads
Claude Opus 4.1: 32.2 (#76), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | 60% | 74.5% |
| LMArena Hard Prompts | 1443 | 1486 |
| DTBench | 80% | 94.7% |
| LMCA | 37.1% | 48.4% |
| Epoch Capabilities Index | 144.12 | 154.87 |
| NYT Connections (extended) | — | 79.2% |
| CritPt | — | 17.7% |
| Chess Puzzles | 7% | — |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| Mystery Game Puzzles | 21% | — |
| ForecastBench | 62 | — |
Math Muse Spark 1.2 leads
Claude Opus 4.1: 22.3 (#277), Muse Spark 1.2: 46.4 (#70)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Math | 1431 | 1471 |
| FrontierMath (Tiers 1-3) | 12.6% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.9% | — |
| ProofBench | — | 43% |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Muse Spark 1.2 leads
Claude Opus 4.1: 42.0 (#101), Muse Spark 1.2: 54.1 (#53)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Expert | 1439 | 1480 |
| GPQA Diamond | 77.3% | — |
| Humanity's Last Exam | 11.5% | — |
| SimpleQA Verified | — | 60.3% |
| Confabulations | 17.1% | — |
| Vectara Hallucination Rate | 11.8% | — |
Multimodal Muse Spark 1.2 leads
Claude Opus 4.1: 26.8 (#119), Muse Spark 1.2: 43.4 (#25)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1305 |
| VPCT | 35% | — |
Multilingual Muse Spark 1.2 leads
Claude Opus 4.1: 52.0 (#95), Muse Spark 1.2: 57.1 (#11)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1405 | 1478 |
| LMArena Chinese | 1427 | 1511 |
| LMArena French | 1431 | 1513 |
| LMArena Russian | 1422 | 1487 |
| LMArena Spanish | 1448 | 1498 |
| LMArena German | 1413 | — |
| LMArena Japanese | 1378 | — |
| LMArena Korean | 1380 | — |
Instruction Following Muse Spark 1.2 leads
Claude Opus 4.1: 75.6 (#58), Muse Spark 1.2: 76.7 (#36)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1435 | 1461 |
Long Context Too close to call
Claude Opus 4.1: 44.5 (#63), Muse Spark 1.2: 45.2 (#48)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1455 | 1475 |
Writing & Preference Muse Spark 1.2 leads
Claude Opus 4.1: 62.4 (#74), Muse Spark 1.2: 72.3 (#14)
| Benchmark | Claude Opus 4.1 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1419 | 1482 |
| LMArena Creative Writing | 1412 | 1449 |
| LMArena Multi-Turn | 1444 | 1494 |
| Short-Story Creative Writing | 84.7% | — |
| EQ-Bench Creative Writing | — | 1840 |
Frequently asked questions
Is Claude Opus 4.1 better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 41.0 on the Noometry Index.
Which is cheaper, Claude Opus 4.1 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 4.1 lists at $15 and $75.
Is Claude Opus 4.1 or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 44.4 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 4.1 and Muse Spark 1.2 share?
20 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Muse Spark 1.2 has 31.