# Claude Sonnet 4.5 vs Muse Spark

> Side-by-side benchmark comparison for Claude Sonnet 4.5 and Muse Spark across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-5-vs-muse-spark
- Last updated: October 5, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Muse Spark leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Muse Spark has the higher overall point estimate 59.99 to 48.54. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 19.1 for Claude Sonnet 4.5 and 53.4 for Muse Spark.
- The biggest single benchmark swing is ARC-AGI-2 in Reasoning, with scores of 13.6% and 42.5%.
- Muse Spark also has the larger context window at 262K.

## Model Snapshot

| Property | Claude Sonnet 4.5 | Muse Spark |
|----------|----------|----------|
| Creator | Anthropic | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 262K |
| Overall Score | 48.54 | 59.99 |
| Benchmarks Covered | 11 | 27 |
| Pricing (input/output) | $3.00 / $15.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Sonnet 4.5 public-lane score: 33.6 (Estimated · #74/119)
- Muse Spark public-lane score: 49.8 (Supported · #43/119)

| Benchmark | Claude Sonnet 4.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50% | 59% | Muse Spark |
| OSWorld-Verified | 61.4% | Coming soon | Coming soon |
| VITA-Bench | 17.0% | Coming soon | Coming soon |
| Gert Labs | 48.51% | Coming soon | Coming soon |
| JobBench | 27.7% | Coming soon | Coming soon |
| τ²-bench results | Coming soon | 91.5% | Coming soon |
| DeepSearchQA | Coming soon | 74.8% | Coming soon |
| CyberGym | Coming soon | 43.5% | Coming soon |
| Claw-Eval | Coming soon | 63.8% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Muse Spark public-lane score: 51.1 (Supported · #39/144)

| Benchmark | Claude Sonnet 4.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.2% | 77.4% | Muse Spark |
| SWE-bench Pro | Coming soon | 52.4% | Coming soon |
| LiveCodeBench Pro | Coming soon | 80.0% | Coming soon |
| Vibe Code Bench | Coming soon | 19.67% | Coming soon |
| SWE-bench (Vals) | Coming soon | 74.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 19.1 (Unranked · 1 rankable row)
- Muse Spark public-lane score: 53.4 (Unranked · 3 rankable rows)

| Benchmark | Claude Sonnet 4.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 13.6% | 42.5% | Muse Spark |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Muse Spark public-lane score: 78.5 (#14/49)

| Benchmark | Claude Sonnet 4.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 86.4% | Coming soon |
| MMMU-Pro | Coming soon | 80.4% | Coming soon |
| ERQA | Coming soon | 64.7% | Coming soon |
| SimpleVQA | Coming soon | 71.3% | Coming soon |
| ScreenSpot Pro | Coming soon | 84.1% | Coming soon |
| ZeroBench | Coming soon | 33.0% | Coming soon |
| MedXpertQA (MM) | Coming soon | 78.4% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Muse Spark public-lane score: 60.3 (Supported · #40/171)

| Benchmark | Claude Sonnet 4.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83.4% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 89.5% | Coming soon |
| HLE | Coming soon | 50.4% | Coming soon |
| HLE w/o tools | Coming soon | 42.8% | Coming soon |
| HealthBench Hard | Coming soon | 42.8% | Coming soon |
| MedXpertQA (Text) | Coming soon | 52.6% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 89.6% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 87.3% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Muse Spark public-lane score: 91.9 (#8/125)

### Mathematics

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 34.6 (Unranked · 2 rankable rows)
- Muse Spark public-lane score: 55.1 (Unranked · 2 rankable rows)

| Benchmark | Claude Sonnet 4.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 87% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 13.495% | 39.000% | Muse Spark |
| FrontierMath v2 (Tier 4) | 4.167% | 14.600% | Muse Spark |

## FAQ

### Which is better overall, Claude Sonnet 4.5 or Muse Spark?

Muse Spark has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Sonnet 4.5 and Muse Spark?

The widest category gap is in reasoning, where the averages are 19.1 for Claude Sonnet 4.5 and 53.4 for Muse Spark.

### How many benchmarks does Claude Sonnet 4.5 cover on BenchLM?

Claude Sonnet 4.5 currently has 11 sourced benchmark scores on BenchLM.

### How many benchmarks does Muse Spark cover on BenchLM?

Muse Spark currently has 27 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [Muse Spark vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-thinking-vs-muse-spark)
- [Claude Sonnet 4.5 vs Muse Spark 1.2](/compare/claude-sonnet-4-5-vs-muse-spark-1-2)
- [Muse Spark vs Muse Spark 1.2](/compare/muse-spark-vs-muse-spark-1-2)

## Explore More

- [Claude Sonnet 4.5 profile](/models/claude-sonnet-4-5)
- [Muse Spark profile](/models/muse-spark)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)