Model comparison
Mercury 2 vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 39.1 on the Noometry Index.
Last verified . 13 shared benchmarks.
MetaSummary
- They share 13 benchmarks with published results for both. Mercury 2 scores higher in 0 categories and Muse Spark in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 36.2.
- The biggest single-benchmark swing is SciCode: 38.7% for Mercury 2 and 51.5% for Muse Spark.
Side by side
| Mercury 2 | Muse Spark | |
|---|---|---|
| Provider | Inception | Meta |
| Noometry Index | 39.1 | 50.6 |
| Released | 2026-02-20 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | — |
| Max output | 50K | — |
| Input $ / M tokens | $0.25 | — |
| Output $ / M tokens | $0.75 | — |
| Results tracked | 17 | 27 |
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Category by category
Coding Muse Spark leads
Mercury 2: 33.5 (#255), Muse Spark: 46.2 (#69)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| SciCode | 38.7% | 51.5% |
| LMArena Coding | 1391 | 1481 |
| LMArena WebDev | 1171 | — |
| WeirdML | 43.2% | — |
| ALE-Bench | 785.58 | — |
Reasoning Muse Spark leads
Mercury 2: 23.8 (#170), Muse Spark: 35.9 (#67)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| CritPt | 0.8% | 11.3% |
| LMArena Hard Prompts | 1362 | 1474 |
| Epoch Capabilities Index | — | 152.04 |
Math Not comparable
Mercury 2: —, Muse Spark: 47.8 (#66)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| ProofBench | — | 17% |
| LMArena Math | — | 1455 |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
Mercury 2: 36.2 (#172), Muse Spark: 65.7 (#13)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| LMArena Expert | 1358 | 1457 |
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| Vectara Hallucination Rate | 12.3% | — |
Multimodal Not comparable
Mercury 2: —, Muse Spark: 43.4 (#24)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |
Multilingual Muse Spark leads
Mercury 2: 46.6 (#157), Muse Spark: 56.1 (#24)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| LMArena Non-English | 1331 | 1464 |
| LMArena Chinese | 1417 | 1509 |
| LMArena Russian | 1304 | 1466 |
| LMArena French | — | 1497 |
| LMArena German | — | 1497 |
| LMArena Korean | — | 1459 |
| LMArena Spanish | — | 1472 |
Instruction Following Muse Spark leads
Mercury 2: 70.2 (#165), Muse Spark: 75.9 (#51)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1329 | 1442 |
Long Context Muse Spark leads
Mercury 2: 40.5 (#154), Muse Spark: 44.4 (#69)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1330 | 1451 |
Writing & Preference Muse Spark leads
Mercury 2: 53.8 (#155), Muse Spark: 66.0 (#39)
| Benchmark | Mercury 2 | Muse Spark |
|---|---|---|
| LMArena Text | 1355 | 1474 |
| LMArena Creative Writing | 1289 | 1459 |
| LMArena Multi-Turn | 1358 | 1477 |
Frequently asked questions
Is Mercury 2 better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 39.1 on the Noometry Index.
Is Mercury 2 or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 33.5 in the Noometry coding category.
How many benchmarks do Mercury 2 and Muse Spark share?
13 benchmarks have published results for both models. Mercury 2 has 17 scored results on Noometry and Muse Spark has 27.