Model comparison
Solar Pro4 vs Step 2 16k Exp 202412
Solar Pro4 is the stronger model overall, scoring 41.5 to 38.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
Upstage
StepFunSummary
- They share 12 benchmarks with published results for both. Solar Pro4 scores higher in 8 categories and Step 2 16k Exp 202412 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in multilingual, where Solar Pro4 leads 49.0 to 43.9.
Side by side
| Solar Pro4 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Upstage | StepFun |
| Noometry Index | 41.5 | 38.6 |
| Released | 2026-08-06 | — |
| Weights | Proprietary | Proprietary |
| Context window | 524K | — |
| Max output | 131K | — |
| Input $ / M tokens | $0.30 | — |
| Output $ / M tokens | $1.20 | — |
| Results tracked | 18 | 12 |
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Category by category
Coding Solar Pro4 leads
Solar Pro4: 39.9 (#135), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1439 | 1316 |
| LMArena WebDev | 1371 | — |
Reasoning Solar Pro4 leads
Solar Pro4: 27.3 (#107), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1398 | 1299 |
Math Solar Pro4 leads
Solar Pro4: 36.1 (#129), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1418 | 1305 |
Knowledge Solar Pro4 leads
Solar Pro4: 39.0 (#128), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1421 | 1279 |
Multilingual Solar Pro4 leads
Solar Pro4: 49.0 (#134), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1362 | 1290 |
| LMArena Chinese | 1417 | 1331 |
| LMArena Russian | 1360 | 1324 |
| LMArena French | 1403 | — |
| LMArena German | 1351 | — |
| LMArena Japanese | 1300 | — |
| LMArena Korean | 1383 | — |
| LMArena Spanish | 1408 | — |
Instruction Following Solar Pro4 leads
Solar Pro4: 72.8 (#128), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1287 |
Long Context Solar Pro4 leads
Solar Pro4: 42.0 (#125), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1379 | 1307 |
Writing & Preference Solar Pro4 leads
Solar Pro4: 56.7 (#133), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | Solar Pro4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1386 | 1321 |
| LMArena Creative Writing | 1313 | 1328 |
| LMArena Multi-Turn | 1391 | 1292 |
Frequently asked questions
Is Solar Pro4 better than Step 2 16k Exp 202412?
Solar Pro4 is the stronger model overall, scoring 41.5 to 38.6 on the Noometry Index.
Is Solar Pro4 or Step 2 16k Exp 202412 better for coding?
Solar Pro4 scores higher on coding benchmarks: 39.9 versus 37.9 in the Noometry coding category.
How many benchmarks do Solar Pro4 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Step 2 16k Exp 202412 has 12.