Model comparison
Claude Haiku 5.5 vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 49.5 on the Noometry Index.
Last verified . 2 shared benchmarks.
MetaSummary
- They share 2 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 3 categories and Muse Spark in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 47.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 98.9% for Claude Haiku 5.5 and 88.9% for Muse Spark.
Side by side
| Claude Haiku 5.5 | Muse Spark | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 49.5 | 50.6 |
| Released | 2026-10-07 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 9 | 27 |
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Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Muse Spark: 46.2 (#69)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| LMArena WebDev | 1587 | — |
| SciCode | — | 51.5% |
| LMArena Coding | — | 1481 |
Reasoning Too close to call
Claude Haiku 5.5: 35.2 (#69), Muse Spark: 35.9 (#67)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| NYT Connections (extended) | 65.7% | — |
| CritPt | — | 11.3% |
| LMArena Hard Prompts | — | 1474 |
| Mystery Game Puzzles | 30% | — |
| Epoch Capabilities Index | — | 152.04 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Muse Spark: 47.8 (#66)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 88.9% |
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| ProofBench | — | 17% |
| LMArena Math | — | 1455 |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
Claude Haiku 5.5: 50.8 (#70), Muse Spark: 65.7 (#13)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| GPQA Diamond | 89.6% | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| SimpleQA Verified | 23.8% | — |
| LMArena Expert | — | 1457 |
Multimodal Too close to call
Claude Haiku 5.5: 43.7 (#21), Muse Spark: 43.4 (#24)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| Furniture Assembly | 47.5% | — |
| LMArena Document | — | 1444 |
Multilingual Not comparable
Claude Haiku 5.5: —, Muse Spark: 56.1 (#24)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| LMArena Non-English | — | 1464 |
| LMArena Chinese | — | 1509 |
| LMArena French | — | 1497 |
| LMArena German | — | 1497 |
| LMArena Korean | — | 1459 |
| LMArena Russian | — | 1466 |
| LMArena Spanish | — | 1472 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Muse Spark: 75.9 (#51)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | — | 1442 |
Long Context Not comparable
Claude Haiku 5.5: —, Muse Spark: 44.4 (#69)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| LMArena Longer Query | — | 1451 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Muse Spark: 66.0 (#39)
| Benchmark | Claude Haiku 5.5 | Muse Spark |
|---|---|---|
| LMArena Text | — | 1474 |
| LMArena Creative Writing | — | 1459 |
| LMArena Multi-Turn | — | 1477 |
Frequently asked questions
Is Claude Haiku 5.5 better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 49.5 on the Noometry Index.
Is Claude Haiku 5.5 or Muse Spark better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 46.2 in the Noometry coding category.
How many benchmarks do Claude Haiku 5.5 and Muse Spark share?
2 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Muse Spark has 27.