Model comparison
Claude Opus 4 vs Muse Spark 1.3
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 43.1 on the Noometry Index.
Last verified . 24 shared benchmarks.
MetaSummary
- They share 24 benchmarks with published results for both. Claude Opus 4 scores higher in 1 category and Muse Spark 1.3 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.3 leads 73.1 to 42.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 64.4% for Claude Opus 4 and 99.2% for Muse Spark 1.3.
- Muse Spark 1.3 is cheaper at $1.25 / $4.25 per million input/output tokens, against $15 / $75 for Claude Opus 4.
- Muse Spark 1.3 accepts more context: 1.05M tokens versus 200K.
Side by side
| Claude Opus 4 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 43.1 | 54.8 |
| Released | 2025-05-22 | 2026-09-02 |
| 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 | 37 |
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Category by category
Coding Muse Spark 1.3 leads
Claude Opus 4: 47.2 (#62), Muse Spark 1.3: 56.6 (#21)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Coding | 1442 | 1514 |
| SWE-bench Verified | 70.7% | — |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| CursorBench | — | 41.6% |
| LMArena WebDev | — | 1657 |
| SciCode | — | 59.7% |
| GSO | 6.9% | — |
| WeirdML | 43.7% | — |
| AlgoTune | 1.33 | — |
Agentic & Tool Use Muse Spark 1.3 leads
Claude Opus 4: 34.8 (#42), Muse Spark 1.3: 38.6 (#30)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | — | 57.8% |
| Cybench | 38% | — |
| DeepResearch Bench | 46.8% | — |
| GDP.pdf | — | 27.6% |
| LMArena Search | 1127 | — |
| METR Time Horizons | 63.9% | — |
Reasoning Muse Spark 1.3 leads
Claude Opus 4: 27.3 (#121), Muse Spark 1.3: 54.0 (#27)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| CritPt | 0.3% | 26% |
| LMArena Hard Prompts | 1399 | 1503 |
| DTBench | 81.6% | 96.5% |
| LMCA | 37.4% | 53.9% |
| Epoch Capabilities Index | 142.67 | 156.75 |
| ARC-AGI-2 | 8.6% | — |
| SimpleBench | 58.8% | — |
| Kagi LLM Benchmark | 74.3% | — |
| NYT Connections (extended) | — | 85.1% |
| ARC-AGI-1 | 35.7% | — |
| Chess Puzzles | — | 38% |
| EnigmaEval | 5.6% | — |
| Mystery Game Puzzles | — | 25% |
| Bench to the Future 3 | — | 0.14 |
| ForecastBench | 61.1 | — |
Math Muse Spark 1.3 leads
Claude Opus 4: 42.0 (#86), Muse Spark 1.3: 73.1 (#21)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 64.4% | 99.2% |
| LMArena Math | 1390 | 1494 |
| FrontierMath (Tiers 1-3) | — | 74.4% |
| FrontierMath Tier 4 | — | 46.3% |
| ProofBench | — | 58% |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Opus 4 leads
Claude Opus 4: 44.0 (#88), Muse Spark 1.3: 42.6 (#95)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1386 | 1516 |
| GPQA Diamond | 76.3% | — |
| Humanity's Last Exam | 10.7% | — |
| MMLU-Pro | 87.5% | — |
| Confabulations | 15.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |
Multimodal Muse Spark 1.3 leads
Claude Opus 4: 31.5 (#106), Muse Spark 1.3: 43.7 (#22)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1192 | 1309 |
| GeoBench | 49% | — |
| VPCT | 38% | — |
| LMArena Document | — | 1471 |
Multilingual Muse Spark 1.3 leads
Claude Opus 4: 48.8 (#138), Muse Spark 1.3: 57.4 (#8)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1362 | 1481 |
| LMArena Chinese | 1386 | 1529 |
| LMArena French | 1372 | 1524 |
| LMArena German | 1391 | 1515 |
| LMArena Japanese | 1331 | 1474 |
| LMArena Korean | 1321 | 1501 |
| LMArena Russian | 1392 | 1490 |
| LMArena Spanish | 1389 | 1490 |
Instruction Following Too close to call
Claude Opus 4: 77.1 (#28), Muse Spark 1.3: 77.5 (#22)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1477 |
| IFEval | 91.8% | — |
Long Context Muse Spark 1.3 leads
Claude Opus 4: 39.6 (#172), Muse Spark 1.3: 45.6 (#32)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1422 | 1488 |
| Fiction.LiveBench | 61.1% | — |
Writing & Preference Muse Spark 1.3 leads
Claude Opus 4: 61.2 (#89), Muse Spark 1.3: 73.6 (#9)
| Benchmark | Claude Opus 4 | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1377 | 1490 |
| LMArena Creative Writing | 1387 | 1455 |
| EQ-Bench Creative Writing | 1580 | 1906 |
| LMArena Multi-Turn | 1396 | 1482 |
| Short-Story Creative Writing | 83.6% | — |
| WildBench | 85.2% | — |
Frequently asked questions
Is Claude Opus 4 better than Muse Spark 1.3?
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 43.1 on the Noometry Index.
Which is cheaper, Claude Opus 4 or Muse Spark 1.3?
Muse Spark 1.3 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 1.3 better for coding?
Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 47.2 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 200K.
How many benchmarks do Claude Opus 4 and Muse Spark 1.3 share?
24 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Muse Spark 1.3 has 37.