Model comparison
Mercury 2.5 vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 33.5 on the Noometry Index.
Last verified . 3 shared benchmarks.
MetaSummary
- They share 3 benchmarks with published results for both. Mercury 2.5 scores higher in 0 categories and Muse Spark in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark leads 47.8 to 23.3.
- The biggest single-benchmark swing is ProofBench: 3% for Mercury 2.5 and 17% for Muse Spark.
Side by side
| Mercury 2.5 | Muse Spark | |
|---|---|---|
| Provider | Inception | Meta |
| Noometry Index | 33.5 | 50.6 |
| Released | 2026-09-08 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 260K | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.04 | — |
| Output $ / M tokens | $0.15 | — |
| Results tracked | 4 | 27 |
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Category by category
Coding Muse Spark leads
Mercury 2.5: 39.5 (#156), Muse Spark: 46.2 (#69)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| SciCode | 38.5% | 51.5% |
| LMArena Coding | — | 1481 |
| ALE-Bench | 301.65 | — |
Reasoning Muse Spark leads
Mercury 2.5: 22.4 (#193), Muse Spark: 35.9 (#67)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| CritPt | 0% | 11.3% |
| LMArena Hard Prompts | — | 1474 |
| Epoch Capabilities Index | — | 152.04 |
Math Muse Spark leads
Mercury 2.5: 23.3 (#272), Muse Spark: 47.8 (#66)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| ProofBench | 3% | 17% |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| LMArena Math | — | 1455 |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Not comparable
Mercury 2.5: —, Muse Spark: 65.7 (#13)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| LMArena Expert | — | 1457 |
Multimodal Not comparable
Mercury 2.5: —, Muse Spark: 43.4 (#24)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |
Multilingual Not comparable
Mercury 2.5: —, Muse Spark: 56.1 (#24)
| Benchmark | Mercury 2.5 | 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
Mercury 2.5: —, Muse Spark: 75.9 (#51)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | — | 1442 |
Long Context Not comparable
Mercury 2.5: —, Muse Spark: 44.4 (#69)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| LMArena Longer Query | — | 1451 |
Writing & Preference Not comparable
Mercury 2.5: —, Muse Spark: 66.0 (#39)
| Benchmark | Mercury 2.5 | Muse Spark |
|---|---|---|
| LMArena Text | — | 1474 |
| LMArena Creative Writing | — | 1459 |
| LMArena Multi-Turn | — | 1477 |
Frequently asked questions
Is Mercury 2.5 better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 33.5 on the Noometry Index.
Is Mercury 2.5 or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 39.5 in the Noometry coding category.
How many benchmarks do Mercury 2.5 and Muse Spark share?
3 benchmarks have published results for both models. Mercury 2.5 has 4 scored results on Noometry and Muse Spark has 27.