# Claude Opus 4.5 vs Muse Spark 1.2

> Claude Opus 4.5 and Muse Spark 1.2 score almost the same on the Noometry Index (50.5 vs 49.8), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/claude-opus-4-5-vs-muse-spark-1-2
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Claude Opus 4.5 scores higher in 5 categories and Muse Spark 1.2 in 5 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Claude Opus 4.5 leads 47.2 to 29.5.
- The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 79.2% for Muse Spark 1.2.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 200K.

## Snapshot

| | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 50.5 | 49.8 |
| Rank | 39 | 44 |
| Context | 200K | 1.05M |
| Input $/M | $5 | $1.25 |
| Output $/M | $25 | $4.25 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4.5: 55.4 (#21)
- Muse Spark 1.2: 48.6 (#49)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1493 | 1532 |
| WeirdML | 63.7% | 60.3% |
| LMArena Coding | 1504 | 1497 |
| SWE-bench Verified | 76.7% | — |
| DeepSWE | — | 54.9% |
| SWE-bench Verified (bash only) | 76.8% | — |
| SWE-bench Multilingual | 70.7% | — |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| GSO | 26.5% | — |
| ALE-Bench | 1,025 | — |
| AlgoTune | 1.77 | — |

## Agentic & Tool Use

- Claude Opus 4.5: 47.2 (#11)
- Muse Spark 1.2: 29.5 (#77)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| Terminal-Bench | 63.1% | — |
| APEX-Agents | — | 36.4% |
| 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% | — |
| GDP.pdf | — | 16% |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |

## Reasoning

- Claude Opus 4.5: 42.5 (#43)
- Muse Spark 1.2: 50.4 (#32)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | 62% | 74.5% |
| NYT Connections (extended) | 52.5% | 79.2% |
| LMArena Hard Prompts | 1476 | 1490 |
| DTBench | 89.9% | 94.7% |
| LMCA | 44.5% | 48.4% |
| Epoch Capabilities Index | 150.1 | 155.18 |
| ARC-AGI-2 | 37.6% | — |
| Kagi LLM Benchmark | 80.2% | — |
| ARC-AGI-1 | 80% | — |
| CritPt | — | 17.7% |
| Chess Puzzles | 12% | — |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 22% | — |
| ForecastBench | 60.7 | — |

## Math

- Claude Opus 4.5: 38.5 (#85)
- Muse Spark 1.2: 43.8 (#68)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 36% | 43% |
| FrontierMath (Tiers 1-3) | 34.4% | — |
| FrontierMath Tier 4 | 4.9% | — |
| OTIS Mock AIME 2024-2025 | 86.1% | — |
| LMArena Math | 1463 | — |
| FrontierMath (Feb 2025 set) | 20.7% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4.5: 56.4 (#38)
- Muse Spark 1.2: 53.9 (#49)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | 45.7% | 60.3% |
| LMArena Expert | 1488 | 1485 |
| GPQA Diamond | 86% | — |
| Humanity's Last Exam | 25.2% | — |
| Vectara Hallucination Rate | 10.9% | — |

## Multimodal

- Claude Opus 4.5: 31.1 (#99)
- Muse Spark 1.2: 42.6 (#24)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1304 |
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |

## Multilingual

- Claude Opus 4.5: 54.5 (#45)
- Muse Spark 1.2: 57.4 (#10)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1438 | 1479 |
| LMArena Chinese | 1470 | 1519 |
| LMArena Russian | 1448 | 1494 |
| LMArena French | 1471 | — |
| LMArena German | 1449 | — |
| LMArena Japanese | 1415 | — |
| LMArena Korean | 1424 | — |
| LMArena Spanish | 1455 | — |

## Instruction Following

- Claude Opus 4.5: 77.7 (#20)
- Muse Spark 1.2: 77.1 (#30)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1478 | 1466 |

## Long Context

- Claude Opus 4.5: 46.4 (#21)
- Muse Spark 1.2: 45.4 (#35)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1480 | 1483 |
| CL-bench | 21.1% | — |

## Writing & Preference

- Claude Opus 4.5: 68.2 (#28)
- Muse Spark 1.2: 72.6 (#14)

| Benchmark | Claude Opus 4.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1451 | 1486 |
| LMArena Creative Writing | 1445 | 1444 |
| EQ-Bench Creative Writing | 1687 | 1840 |
| LMArena Multi-Turn | 1466 | 1504 |

## FAQ

### Is Claude Opus 4.5 better than Muse Spark 1.2?

Claude Opus 4.5 and Muse Spark 1.2 score almost the same on the Noometry Index (50.5 vs 49.8), so choose on price, context window or the category you care about most.

### Which is cheaper, Claude Opus 4.5 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 4.5 lists at $5 and $25.

### Is Claude Opus 4.5 or Muse Spark 1.2 better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 48.6 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 4.5 and Muse Spark 1.2 share?

21 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Muse Spark 1.2 has 28.