Model comparison
Hy4 preview vs Step 2 16k Exp 202412
Hy4 preview is the stronger model overall, scoring 44.6 to 38.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
Tencent
StepFunSummary
- The widest gap is in math, where Hy4 preview leads 54.5 to 33.6.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Hy4 preview | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Tencent | StepFun |
| Noometry Index | 44.6 | 38.6 |
| Released | 2026-08-28 | — |
| Weights | Open | Proprietary |
| Context window | 1.05M | — |
| Max output | 64K | — |
| Input $ / M tokens | $0.83 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 3 | 12 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.4 (#36), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena WebDev | 1633 | — |
| LMArena Coding | — | 1316 |
Reasoning Hy4 preview leads
Hy4 preview: 30.6 (#75), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| NYT Connections (extended) | 68.2% | — |
| LMArena Hard Prompts | — | 1299 |
Math Hy4 preview leads
Hy4 preview: 54.5 (#37), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| ProofBench | 75% | — |
| LMArena Math | — | 1305 |
Knowledge Not comparable
Hy4 preview: —, Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | — | 1279 |
Multilingual Not comparable
Hy4 preview: —, Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | — | 1290 |
| LMArena Chinese | — | 1331 |
| LMArena Russian | — | 1324 |
Instruction Following Not comparable
Hy4 preview: —, Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | — | 1287 |
Long Context Not comparable
Hy4 preview: —, Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | — | 1307 |
Writing & Preference Not comparable
Hy4 preview: —, Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | Hy4 preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | — | 1321 |
| LMArena Creative Writing | — | 1328 |
| LMArena Multi-Turn | — | 1292 |
Frequently asked questions
Is Hy4 preview better than Step 2 16k Exp 202412?
Hy4 preview is the stronger model overall, scoring 44.6 to 38.6 on the Noometry Index.
Is Hy4 preview or Step 2 16k Exp 202412 better for coding?
Hy4 preview scores higher on coding benchmarks: 51.4 versus 37.9 in the Noometry coding category.
How many benchmarks do Hy4 preview and Step 2 16k Exp 202412 share?
0 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Step 2 16k Exp 202412 has 12.