Model comparison
Muse Spark 1.2 vs Solar Pro4
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 42.1 on the Noometry Index. Solar Pro4 costs 3.8× 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.
Meta
UpstageSummary
- They share 15 benchmarks with published results for both. Muse Spark 1.2 scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 28.5.
- Solar Pro4 is cheaper at $0.30 / $1.20 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 524K.
Side by side
| Muse Spark 1.2 | Solar Pro4 | |
|---|---|---|
| Provider | Meta | Upstage |
| Noometry Index | 50.3 | 42.1 |
| Released | 2026-08-05 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 524K |
| Max output | 131K | 131K |
| Input $ / M tokens | $1.25 | $0.30 |
| Output $ / M tokens | $4.25 | $1.20 |
| Results tracked | 31 | 18 |
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Category by category
Coding Muse Spark 1.2 leads
Muse Spark 1.2: 49.2 (#51), Solar Pro4: 40.1 (#149)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1533 | 1371 |
| LMArena Coding | 1495 | 1437 |
| DeepSWE | 54.9% | — |
| FrontierSWE | 12% | — |
| SciCode | 56.4% | — |
| WeirdML | 60.3% | — |
Agentic & Tool Use Not comparable
Muse Spark 1.2: 29.4 (#87), Solar Pro4: —
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| APEX-Agents | 36.4% | — |
| GDP.pdf | 16% | — |
Reasoning Muse Spark 1.2 leads
Muse Spark 1.2: 51.3 (#34), Solar Pro4: 28.5 (#104)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1486 | 1399 |
| SimpleBench | 74.5% | — |
| NYT Connections (extended) | 79.2% | — |
| CritPt | 17.7% | — |
| DTBench | 94.7% | — |
| LMCA | 48.4% | — |
| Epoch Capabilities Index | 154.87 | — |
Math Muse Spark 1.2 leads
Muse Spark 1.2: 46.4 (#70), Solar Pro4: 38.8 (#128)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Math | 1471 | 1416 |
| ProofBench | 43% | — |
Knowledge Muse Spark 1.2 leads
Muse Spark 1.2: 54.1 (#53), Solar Pro4: 39.8 (#129)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1480 | 1427 |
| SimpleQA Verified | 60.3% | — |
Multimodal Not comparable
Muse Spark 1.2: 43.4 (#25), Solar Pro4: —
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1305 | — |
Multilingual Muse Spark 1.2 leads
Muse Spark 1.2: 57.1 (#11), Solar Pro4: 48.7 (#139)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1478 | 1361 |
| LMArena Chinese | 1511 | 1415 |
| LMArena French | 1513 | 1397 |
| LMArena Russian | 1487 | 1360 |
| LMArena Spanish | 1498 | 1401 |
| LMArena German | — | 1364 |
| LMArena Japanese | — | 1309 |
| LMArena Korean | — | 1382 |
Instruction Following Muse Spark 1.2 leads
Muse Spark 1.2: 76.7 (#36), Solar Pro4: 72.7 (#132)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1461 | 1377 |
Long Context Muse Spark 1.2 leads
Muse Spark 1.2: 45.2 (#48), Solar Pro4: 42.1 (#130)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1475 | 1381 |
Writing & Preference Muse Spark 1.2 leads
Muse Spark 1.2: 72.3 (#14), Solar Pro4: 56.5 (#138)
| Benchmark | Muse Spark 1.2 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1482 | 1386 |
| LMArena Creative Writing | 1449 | 1316 |
| LMArena Multi-Turn | 1494 | 1385 |
| EQ-Bench Creative Writing | 1840 | — |
Frequently asked questions
Is Muse Spark 1.2 better than Solar Pro4?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 42.1 on the Noometry Index. Solar Pro4 costs 3.8× 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, Muse Spark 1.2 or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is Muse Spark 1.2 or Solar Pro4 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 524K.
How many benchmarks do Muse Spark 1.2 and Solar Pro4 share?
15 benchmarks have published results for both models. Muse Spark 1.2 has 31 scored results on Noometry and Solar Pro4 has 18.