# Claude Haiku 4.5 vs Muse Spark 1.2

> Side-by-side benchmark comparison for Claude Haiku 4.5 and Muse Spark 1.2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-haiku-4-5-vs-muse-spark-1-2
- Last updated: September 18, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Muse Spark 1.2 if you want the stronger benchmark profile. Claude Haiku 4.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Muse Spark 1.2 leads overall 70.28 to 52.89.
- The clearest category separation is in agentic, where the averages are 27 for Claude Haiku 4.5 and 61 for Muse Spark 1.2.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 43.8% and 69.7%.
- Muse Spark 1.2 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Muse Spark 1.2 also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Haiku 4.5 | Muse Spark 1.2 |
|----------|----------|----------|
| Creator | Anthropic | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Overall Score | 52.89 | 70.28 |
| Benchmarks Covered | 10 | 8 |
| Pricing (input/output) | $1.00 / $5.00 | $1.25 / $4.25 |

## Category Breakdown

### Agentic

- Winner: Muse Spark 1.2
- Claude Haiku 4.5 public-lane score: 27 (Supported · #146/154)
- Muse Spark 1.2 public-lane score: 61 (Supported · #16/154)

| Benchmark | Claude Haiku 4.5 | Muse Spark 1.2 | Winner |
|-----------|-----------|-----------|--------|
| JobBench | 16.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 43.8% | 69.7% | Muse Spark 1.2 |
| Terminal-Bench 2.1 | Coming soon | 82.9% | Coming soon |

### Coding

- Winner: Muse Spark 1.2
- Claude Haiku 4.5 public-lane score: 27.4 (Supported · #147/154)
- Muse Spark 1.2 public-lane score: 60 (Supported · #21/154)

| Benchmark | Claude Haiku 4.5 | Muse Spark 1.2 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 73.3% | Coming soon | Coming soon |
| VulcanBench v3 | 76.2% | 87.0% | Muse Spark 1.2 |
| LiveCodeBench (Vals) | 41.2% | Coming soon | Coming soon |
| SWE-bench (Vals) | 66.6% | 86.6% | Muse Spark 1.2 |
| Terminal-Bench 2.1 | Coming soon | 82.9% | Coming soon |
| DeepSWE | Coming soon | 59.3% | Coming soon |
| FrontierSWE v2 | Coming soon | 12.0% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- Muse Spark 1.2 public-lane score: 75.3 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 44.5 (Estimated · #117/184)
- Muse Spark 1.2 public-lane score: 70.7 (Estimated · #10/184)

| Benchmark | Claude Haiku 4.5 | Muse Spark 1.2 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 72.2% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 78.7% | 88.3% | Muse Spark 1.2 |

### Mathematics

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 28.8 (Unranked · 2 rankable rows)
- Muse Spark 1.2 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Muse Spark 1.2 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 5.903% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 2.083% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Haiku 4.5 or Muse Spark 1.2?

Muse Spark 1.2 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Haiku 4.5 and Muse Spark 1.2?

The widest category gap is in agentic, where the averages are 27 for Claude Haiku 4.5 and 61 for Muse Spark 1.2.

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

Claude Haiku 4.5 currently has 10 sourced benchmark scores on BenchLM.

### How many benchmarks does Muse Spark 1.2 cover on BenchLM?

Muse Spark 1.2 currently has 8 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Haiku 4.5 vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-vs-claude-haiku-4-5-thinking)
- [Muse Spark 1.2 vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-thinking-vs-muse-spark-1-2)
- [Claude Haiku 4.5 vs Muse Spark 1.1](/compare/claude-haiku-4-5-vs-muse-spark-1-1)
- [Muse Spark 1.2 vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-muse-spark-1-2)

## Explore More

- [Claude Haiku 4.5 profile](/models/claude-haiku-4-5)
- [Muse Spark 1.2 profile](/models/muse-spark-1-2)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)