Model comparison
Mercury 2.5 vs Muse Spark 1.3
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 33.5 on the Noometry Index. Mercury 2.5 costs 30× less per token, which makes it the better buy when Muse Spark 1.3's lead doesn't matter for your workload.
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 1.3 in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.3 leads 73.1 to 23.3.
- The biggest single-benchmark swing is ProofBench: 3% for Mercury 2.5 and 58% for Muse Spark 1.3.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.3.
- Muse Spark 1.3 accepts more context: 1.05M tokens versus 260K.
Side by side
| Mercury 2.5 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Inception | Meta |
| Noometry Index | 33.5 | 54.8 |
| Released | 2026-09-08 | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 260K | 1.05M |
| Max output | 66K | 131K |
| Input $ / M tokens | $0.04 | $1.25 |
| Output $ / M tokens | $0.15 | $4.25 |
| Results tracked | 4 | 37 |
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Category by category
Coding Muse Spark 1.3 leads
Mercury 2.5: 39.5 (#156), Muse Spark 1.3: 56.6 (#21)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| SciCode | 38.5% | 59.7% |
| CursorBench | — | 41.6% |
| LMArena WebDev | — | 1657 |
| LMArena Coding | — | 1514 |
| ALE-Bench | 301.65 | — |
Agentic & Tool Use Not comparable
Mercury 2.5: —, Muse Spark 1.3: 38.6 (#30)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | — | 57.8% |
| GDP.pdf | — | 27.6% |
Reasoning Muse Spark 1.3 leads
Mercury 2.5: 22.4 (#193), Muse Spark 1.3: 54.0 (#27)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| CritPt | 0% | 26% |
| NYT Connections (extended) | — | 85.1% |
| Chess Puzzles | — | 38% |
| LMArena Hard Prompts | — | 1503 |
| Mystery Game Puzzles | — | 25% |
| DTBench | — | 96.5% |
| LMCA | — | 53.9% |
| Bench to the Future 3 | — | 0.14 |
| Epoch Capabilities Index | — | 156.75 |
Math Muse Spark 1.3 leads
Mercury 2.5: 23.3 (#272), Muse Spark 1.3: 73.1 (#21)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| ProofBench | 3% | 58% |
| FrontierMath (Tiers 1-3) | — | 74.4% |
| FrontierMath Tier 4 | — | 46.3% |
| OTIS Mock AIME 2024-2025 | — | 99.2% |
| LMArena Math | — | 1494 |
Knowledge Not comparable
Mercury 2.5: —, Muse Spark 1.3: 42.6 (#95)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | — | 1516 |
Multimodal Not comparable
Mercury 2.5: —, Muse Spark 1.3: 43.7 (#22)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | — | 1309 |
| LMArena Document | — | 1471 |
Multilingual Not comparable
Mercury 2.5: —, Muse Spark 1.3: 57.4 (#8)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | — | 1481 |
| LMArena Chinese | — | 1529 |
| LMArena French | — | 1524 |
| LMArena German | — | 1515 |
| LMArena Japanese | — | 1474 |
| LMArena Korean | — | 1501 |
| LMArena Russian | — | 1490 |
| LMArena Spanish | — | 1490 |
Instruction Following Not comparable
Mercury 2.5: —, Muse Spark 1.3: 77.5 (#22)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | — | 1477 |
Long Context Not comparable
Mercury 2.5: —, Muse Spark 1.3: 45.6 (#32)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | — | 1488 |
Writing & Preference Not comparable
Mercury 2.5: —, Muse Spark 1.3: 73.6 (#9)
| Benchmark | Mercury 2.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | — | 1490 |
| LMArena Creative Writing | — | 1455 |
| EQ-Bench Creative Writing | — | 1906 |
| LMArena Multi-Turn | — | 1482 |
Frequently asked questions
Is Mercury 2.5 better than Muse Spark 1.3?
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 33.5 on the Noometry Index. Mercury 2.5 costs 30× less per token, which makes it the better buy when Muse Spark 1.3's lead doesn't matter for your workload.
Which is cheaper, Mercury 2.5 or Muse Spark 1.3?
Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Muse Spark 1.3 lists at $1.25 and $4.25.
Is Mercury 2.5 or Muse Spark 1.3 better for coding?
Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 39.5 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 260K.
How many benchmarks do Mercury 2.5 and Muse Spark 1.3 share?
3 benchmarks have published results for both models. Mercury 2.5 has 4 scored results on Noometry and Muse Spark 1.3 has 37.