Model comparison
Mercury 2 vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 39.1 on the Noometry Index. Mercury 2 costs 5.3× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Last verified . 15 shared benchmarks.
MetaSummary
- They share 15 benchmarks with published results for both. Mercury 2 scores higher in 0 categories and Muse Spark 1.2 in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 23.8.
- The biggest single-benchmark swing is SciCode: 38.7% for Mercury 2 and 56.4% for Muse Spark 1.2.
- Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 128K.
Side by side
| Mercury 2 | Muse Spark 1.2 | |
|---|---|---|
| Provider | Inception | Meta |
| Noometry Index | 39.1 | 50.3 |
| Released | 2026-02-20 | 2026-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 1.05M |
| Max output | 50K | 131K |
| Input $ / M tokens | $0.25 | $1.25 |
| Output $ / M tokens | $0.75 | $4.25 |
| Results tracked | 17 | 31 |
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Category by category
Coding Muse Spark 1.2 leads
Mercury 2: 33.5 (#255), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1171 | 1533 |
| SciCode | 38.7% | 56.4% |
| WeirdML | 43.2% | 60.3% |
| LMArena Coding | 1391 | 1495 |
| DeepSWE | — | 54.9% |
| FrontierSWE | — | 12% |
| ALE-Bench | 785.58 | — |
Agentic & Tool Use Not comparable
Mercury 2: —, Muse Spark 1.2: 29.4 (#87)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| GDP.pdf | — | 16% |
Reasoning Muse Spark 1.2 leads
Mercury 2: 23.8 (#170), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| CritPt | 0.8% | 17.7% |
| LMArena Hard Prompts | 1362 | 1486 |
| SimpleBench | — | 74.5% |
| NYT Connections (extended) | — | 79.2% |
| DTBench | — | 94.7% |
| LMCA | — | 48.4% |
| Epoch Capabilities Index | — | 154.87 |
Math Not comparable
Mercury 2: —, Muse Spark 1.2: 46.4 (#70)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| ProofBench | — | 43% |
| LMArena Math | — | 1471 |
Knowledge Muse Spark 1.2 leads
Mercury 2: 36.2 (#172), Muse Spark 1.2: 54.1 (#53)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena Expert | 1358 | 1480 |
| SimpleQA Verified | — | 60.3% |
| Vectara Hallucination Rate | 12.3% | — |
Multimodal Not comparable
Mercury 2: —, Muse Spark 1.2: 43.4 (#25)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1305 |
Multilingual Muse Spark 1.2 leads
Mercury 2: 46.6 (#157), Muse Spark 1.2: 57.1 (#11)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1331 | 1478 |
| LMArena Chinese | 1417 | 1511 |
| LMArena Russian | 1304 | 1487 |
| LMArena French | — | 1513 |
| LMArena Spanish | — | 1498 |
Instruction Following Muse Spark 1.2 leads
Mercury 2: 70.2 (#165), Muse Spark 1.2: 76.7 (#36)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1329 | 1461 |
Long Context Muse Spark 1.2 leads
Mercury 2: 40.5 (#154), Muse Spark 1.2: 45.2 (#48)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1330 | 1475 |
Writing & Preference Muse Spark 1.2 leads
Mercury 2: 53.8 (#155), Muse Spark 1.2: 72.3 (#14)
| Benchmark | Mercury 2 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1355 | 1482 |
| LMArena Creative Writing | 1289 | 1449 |
| LMArena Multi-Turn | 1358 | 1494 |
| EQ-Bench Creative Writing | — | 1840 |
Frequently asked questions
Is Mercury 2 better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 39.1 on the Noometry Index. Mercury 2 costs 5.3× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Which is cheaper, Mercury 2 or Muse Spark 1.2?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is Mercury 2 or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 33.5 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 128K.
How many benchmarks do Mercury 2 and Muse Spark 1.2 share?
15 benchmarks have published results for both models. Mercury 2 has 17 scored results on Noometry and Muse Spark 1.2 has 31.