# Claude Sonnet 5.5 vs Muse Spark 1.2

> Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 2.0× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-muse-spark-1-2
- Last updated: 2026-10-12
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Muse Spark 1.2 in 2 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 46.4.
- The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 and 43% for Muse Spark 1.2.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 61.9 | 50.3 |
| Rank | 10 | 48 |
| Context | 1M | 1.05M |
| Input $/M | $2 | $1.25 |
| Output $/M | $10 | $4.25 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 67.3 (#6)
- Muse Spark 1.2: 49.2 (#51)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1774 | 1533 |
| FrontierSWE | 61.9% | 12% |
| SciCode | 61% | 56.4% |
| LMArena Coding | 1513 | 1495 |
| DeepSWE | — | 54.9% |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| WeirdML | — | 60.3% |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 45.0 (#16)
- Muse Spark 1.2: 29.4 (#87)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | 75.5% | 36.4% |
| GDP.pdf | — | 16% |

## Reasoning

- Claude Sonnet 5.5: 54.0 (#28)
- Muse Spark 1.2: 51.3 (#34)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| NYT Connections (extended) | 80.5% | 79.2% |
| CritPt | 31.4% | 17.7% |
| LMArena Hard Prompts | 1495 | 1486 |
| Epoch Capabilities Index | 165.03 | 154.87 |
| SimpleBench | — | 74.5% |
| Mystery Game Puzzles | 65% | — |
| DTBench | — | 94.7% |
| LMCA | — | 48.4% |

## Math

- Claude Sonnet 5.5: 87.9 (#6)
- Muse Spark 1.2: 46.4 (#70)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 100% | 43% |
| LMArena Math | 1510 | 1471 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath Erdős | 2.9% | — |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#12)
- Muse Spark 1.2: 54.1 (#53)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | 46.5% | 60.3% |
| LMArena Expert | 1540 | 1480 |
| GPQA Diamond | 95.6% | — |

## Multimodal

- Claude Sonnet 5.5: 51.5 (#6)
- Muse Spark 1.2: 43.4 (#25)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1289 | 1305 |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: 55.3 (#30)
- Muse Spark 1.2: 57.1 (#11)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1452 | 1478 |
| LMArena Chinese | 1522 | 1511 |
| LMArena Russian | 1451 | 1487 |
| LMArena French | — | 1513 |
| LMArena Spanish | — | 1498 |

## Instruction Following

- Claude Sonnet 5.5: 78.3 (#11)
- Muse Spark 1.2: 76.7 (#36)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1461 |

## Long Context

- Claude Sonnet 5.5: 45.9 (#28)
- Muse Spark 1.2: 45.2 (#48)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1498 | 1475 |

## Writing & Preference

- Claude Sonnet 5.5: 66.0 (#40)
- Muse Spark 1.2: 72.3 (#14)

| Benchmark | Claude Sonnet 5.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1471 | 1482 |
| LMArena Creative Writing | 1465 | 1449 |
| LMArena Multi-Turn | 1474 | 1494 |
| EQ-Bench Creative Writing | — | 1840 |

## FAQ

### Is Claude Sonnet 5.5 better than Muse Spark 1.2?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 2.0× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

### Which is cheaper, Claude Sonnet 5.5 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 Sonnet 5.5 lists at $2 and $10.

### Is Claude Sonnet 5.5 or Muse Spark 1.2 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 49.2 in the Noometry coding category.

### Which has the bigger context window?

Muse Spark 1.2 does, with 1.05M tokens against 1M.

### How many benchmarks do Claude Sonnet 5.5 and Muse Spark 1.2 share?

22 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Muse Spark 1.2 has 31.