Model comparison
C4ai Aya Expanse 8b vs Hy4 preview
Hy4 preview is the stronger model overall, scoring 45.3 to 34.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
Cohere
TencentSummary
- The widest gap is in math, where Hy4 preview leads 55.7 to 33.3.
Side by side
| C4ai Aya Expanse 8b | Hy4 preview | |
|---|---|---|
| Provider | Cohere | Tencent |
| Noometry Index | 34.9 | 45.3 |
| Released | — | 2026-08-28 |
| Weights | Open | Open |
| Context window | — | 1.05M |
| Max output | — | 64K |
| Input $ / M tokens | — | $0.75 |
| Output $ / M tokens | — | $2.25 |
| Results tracked | 15 | 3 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Hy4 preview leads
C4ai Aya Expanse 8b: 33.8 (#252), Hy4 preview: 51.6 (#38)
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1632 |
| LMArena Coding | 1160 | — |
Reasoning Hy4 preview leads
C4ai Aya Expanse 8b: 22.4 (#197), Hy4 preview: 31.9 (#79)
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | — | 68.2% |
| LMArena Hard Prompts | 1156 | — |
Math Hy4 preview leads
C4ai Aya Expanse 8b: 33.3 (#203), Hy4 preview: 55.7 (#42)
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| ProofBench | — | 75% |
| LMArena Math | 1168 | — |
Knowledge Not comparable
C4ai Aya Expanse 8b: 33.6 (#201), Hy4 preview: —
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | — |
| LMArena Expert | 1153 | — |
Multilingual Not comparable
C4ai Aya Expanse 8b: 36.1 (#242), Hy4 preview: —
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1180 | — |
| LMArena Chinese | 1181 | — |
| LMArena German | 1188 | — |
| LMArena Japanese | 1120 | — |
| LMArena Russian | 1197 | — |
Instruction Following Not comparable
C4ai Aya Expanse 8b: 60.1 (#253), Hy4 preview: —
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1155 | — |
Long Context Not comparable
C4ai Aya Expanse 8b: 36.1 (#236), Hy4 preview: —
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1191 | — |
Writing & Preference Not comparable
C4ai Aya Expanse 8b: 39.0 (#250), Hy4 preview: —
| Benchmark | C4ai Aya Expanse 8b | Hy4 preview |
|---|---|---|
| LMArena Text | 1185 | — |
| LMArena Creative Writing | 1168 | — |
| LMArena Multi-Turn | 1160 | — |
Frequently asked questions
Is C4ai Aya Expanse 8b better than Hy4 preview?
Hy4 preview is the stronger model overall, scoring 45.3 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or Hy4 preview better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 33.8 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and Hy4 preview share?
0 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Hy4 preview has 3.