Model comparison
Hy4 preview vs Yi-Lightning
Hy4 preview is the stronger model overall, scoring 44.6 to 36.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
TencentSummary
- The widest gap is in coding, where Hy4 preview leads 51.4 to 27.0.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Hy4 preview | Yi-Lightning | |
|---|---|---|
| Provider | Tencent | 01.AI |
| Noometry Index | 44.6 | 36.5 |
| Released | 2026-08-28 | 2024-12-02 |
| Weights | Open | Proprietary |
| Context window | 1.05M | — |
| Max output | 64K | — |
| Input $ / M tokens | $0.83 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 3 | 18 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.4 (#36), Yi-Lightning: 27.0 (#315)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1633 | — |
| LMArena Coding | — | 1313 |
Reasoning Hy4 preview leads
Hy4 preview: 30.6 (#75), Yi-Lightning: 24.9 (#137)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| NYT Connections (extended) | 68.2% | — |
| LMArena Hard Prompts | — | 1302 |
Math Hy4 preview leads
Hy4 preview: 54.5 (#37), Yi-Lightning: 33.5 (#173)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| ProofBench | 75% | — |
| LMArena Math | — | 1300 |
Knowledge Not comparable
Hy4 preview: —, Yi-Lightning: 34.8 (#182)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Expert | — | 1286 |
Multilingual Not comparable
Hy4 preview: —, Yi-Lightning: 42.4 (#191)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Non-English | — | 1269 |
| LMArena Chinese | — | 1320 |
| LMArena French | — | 1304 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |
| LMArena Russian | — | 1255 |
| LMArena Spanish | — | 1315 |
Instruction Following Not comparable
Hy4 preview: —, Yi-Lightning: 67.6 (#191)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | — | 1278 |
Long Context Not comparable
Hy4 preview: —, Yi-Lightning: 39.4 (#176)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | — | 1297 |
Writing & Preference Not comparable
Hy4 preview: —, Yi-Lightning: 50.4 (#178)
| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Text | — | 1302 |
| LMArena Creative Writing | — | 1280 |
| LMArena Multi-Turn | — | 1311 |
Frequently asked questions
Is Hy4 preview better than Yi-Lightning?
Hy4 preview is the stronger model overall, scoring 44.6 to 36.5 on the Noometry Index.
Is Hy4 preview or Yi-Lightning better for coding?
Hy4 preview scores higher on coding benchmarks: 51.4 versus 27.0 in the Noometry coding category.
How many benchmarks do Hy4 preview and Yi-Lightning share?
0 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Yi-Lightning has 18.