Model comparison
Hy4 preview vs Solar Pro4
Hy4 preview is the stronger model overall, scoring 45.3 to 42.1 on the Noometry Index. Solar Pro4 costs 2.4× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
Tencent
UpstageSummary
- They share 1 benchmark with published results for both. Hy4 preview scores higher in 3 categories and Solar Pro4 in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 55.7 to 38.8.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 524K.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Hy4 preview | Solar Pro4 | |
|---|---|---|
| Provider | Tencent | Upstage |
| Noometry Index | 45.3 | 42.1 |
| Released | 2026-08-28 | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 524K |
| Max output | 64K | 131K |
| Input $ / M tokens | $0.83 | $0.30 |
| Output $ / M tokens | $2.50 | $1.20 |
| Results tracked | 3 | 18 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.6 (#38), Solar Pro4: 40.1 (#149)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1632 | 1371 |
| LMArena Coding | — | 1437 |
Reasoning Hy4 preview leads
Hy4 preview: 31.9 (#79), Solar Pro4: 28.5 (#104)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| NYT Connections (extended) | 68.2% | — |
| LMArena Hard Prompts | — | 1399 |
Math Hy4 preview leads
Hy4 preview: 55.7 (#42), Solar Pro4: 38.8 (#128)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| ProofBench | 75% | — |
| LMArena Math | — | 1416 |
Knowledge Not comparable
Hy4 preview: —, Solar Pro4: 39.8 (#129)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1427 |
Multilingual Not comparable
Hy4 preview: —, Solar Pro4: 48.7 (#139)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1361 |
| LMArena Chinese | — | 1415 |
| LMArena French | — | 1397 |
| LMArena German | — | 1364 |
| LMArena Japanese | — | 1309 |
| LMArena Korean | — | 1382 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1401 |
Instruction Following Not comparable
Hy4 preview: —, Solar Pro4: 72.7 (#132)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1377 |
Long Context Not comparable
Hy4 preview: —, Solar Pro4: 42.1 (#130)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1381 |
Writing & Preference Not comparable
Hy4 preview: —, Solar Pro4: 56.5 (#138)
| Benchmark | Hy4 preview | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1316 |
| LMArena Multi-Turn | — | 1385 |
Frequently asked questions
Is Hy4 preview better than Solar Pro4?
Hy4 preview is the stronger model overall, scoring 45.3 to 42.1 on the Noometry Index. Solar Pro4 costs 2.4× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.
Which is cheaper, Hy4 preview or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Hy4 preview lists at $0.83 and $2.50.
Is Hy4 preview or Solar Pro4 better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Hy4 preview does, with 1.05M tokens against 524K.
How many benchmarks do Hy4 preview and Solar Pro4 share?
1 benchmark has published results for both models. Hy4 preview has 3 scored results on Noometry and Solar Pro4 has 18.