Model comparison
Solar Pro4 vs Yi-1.5-34B
Solar Pro4 is the stronger model overall, scoring 42.1 to 30.6 on the Noometry Index.
Last verified . 17 shared benchmarks.
UpstageSummary
- They share 17 benchmarks with published results for both. Solar Pro4 scores higher in 8 categories and Yi-1.5-34B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Solar Pro4 leads 39.8 to 14.8.
- Yi-1.5-34B has downloadable open weights; the other is API-only.
Side by side
| Solar Pro4 | Yi-1.5-34B | |
|---|---|---|
| Provider | Upstage | 01.AI |
| Noometry Index | 42.1 | 30.6 |
| Released | 2026-08-06 | 2024-05-13 |
| Weights | Proprietary | Open |
| Context window | 524K | — |
| Max output | 131K | — |
| Input $ / M tokens | $0.30 | — |
| Output $ / M tokens | $1.20 | — |
| Results tracked | 18 | 21 |
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Category by category
Coding Solar Pro4 leads
Solar Pro4: 40.1 (#149), Yi-1.5-34B: 32.4 (#272)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Coding | 1437 | 1169 |
| LMArena WebDev | 1371 | — |
| BigCodeBench Instruct | — | 33.9% |
| BigCodeBench Complete | — | 43.8% |
Reasoning Solar Pro4 leads
Solar Pro4: 28.5 (#104), Yi-1.5-34B: 22.5 (#191)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1160 |
Math Solar Pro4 leads
Solar Pro4: 38.8 (#128), Yi-1.5-34B: 27.5 (#249)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Math | 1416 | 1182 |
| MATH Level 5 | — | 25.5% |
Knowledge Solar Pro4 leads
Solar Pro4: 39.8 (#129), Yi-1.5-34B: 14.8 (#295)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Expert | 1427 | 1144 |
| GPQA Diamond | — | 32% |
Multilingual Solar Pro4 leads
Solar Pro4: 48.7 (#139), Yi-1.5-34B: 32.3 (#256)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Non-English | 1361 | 1121 |
| LMArena Chinese | 1415 | 1213 |
| LMArena French | 1397 | 1156 |
| LMArena German | 1364 | 1111 |
| LMArena Japanese | 1309 | 1021 |
| LMArena Korean | 1382 | 1005 |
| LMArena Russian | 1360 | 1091 |
| LMArena Spanish | 1401 | 1121 |
Instruction Following Solar Pro4 leads
Solar Pro4: 72.7 (#132), Yi-1.5-34B: 59.2 (#257)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Instruction Following | 1377 | 1139 |
Long Context Solar Pro4 leads
Solar Pro4: 42.1 (#130), Yi-1.5-34B: 34.6 (#248)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Longer Query | 1381 | 1143 |
Writing & Preference Solar Pro4 leads
Solar Pro4: 56.5 (#138), Yi-1.5-34B: 37.4 (#257)
| Benchmark | Solar Pro4 | Yi-1.5-34B |
|---|---|---|
| LMArena Text | 1386 | 1173 |
| LMArena Creative Writing | 1316 | 1135 |
| LMArena Multi-Turn | 1385 | 1153 |
Frequently asked questions
Is Solar Pro4 better than Yi-1.5-34B?
Solar Pro4 is the stronger model overall, scoring 42.1 to 30.6 on the Noometry Index.
Is Solar Pro4 or Yi-1.5-34B better for coding?
Solar Pro4 scores higher on coding benchmarks: 40.1 versus 32.4 in the Noometry coding category.
How many benchmarks do Solar Pro4 and Yi-1.5-34B share?
17 benchmarks have published results for both models. Solar Pro4 has 18 scored results on Noometry and Yi-1.5-34B has 21.