Model comparison
C4ai Aya Expanse 8b vs Yi-Lightning
Yi-Lightning is the stronger model overall, scoring 37.1 to 34.9 on the Noometry Index.
Last verified . 14 shared benchmarks.
CohereSummary
- They share 14 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 1 category and Yi-Lightning in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Yi-Lightning leads 50.2 to 39.0.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.
Side by side
| C4ai Aya Expanse 8b | Yi-Lightning | |
|---|---|---|
| Provider | Cohere | 01.AI |
| Noometry Index | 34.9 | 37.1 |
| Released | — | 2024-12-02 |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 15 | 18 |
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Category by category
Coding C4ai Aya Expanse 8b leads
C4ai Aya Expanse 8b: 33.8 (#252), Yi-Lightning: 27.4 (#320)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1160 | 1312 |
| Aider Polyglot | — | 12.9% |
Reasoning Yi-Lightning leads
C4ai Aya Expanse 8b: 22.4 (#197), Yi-Lightning: 25.9 (#139)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1302 |
Math Yi-Lightning leads
C4ai Aya Expanse 8b: 33.3 (#203), Yi-Lightning: 36.2 (#172)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Math | 1168 | 1300 |
Knowledge Yi-Lightning leads
C4ai Aya Expanse 8b: 33.6 (#201), Yi-Lightning: 35.4 (#185)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1153 | 1286 |
| Vectara Hallucination Rate | 9.5% | — |
Multilingual Yi-Lightning leads
C4ai Aya Expanse 8b: 36.1 (#242), Yi-Lightning: 42.2 (#196)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1180 | 1269 |
| LMArena Chinese | 1181 | 1320 |
| LMArena German | 1188 | 1267 |
| LMArena Japanese | 1120 | 1228 |
| LMArena Russian | 1197 | 1255 |
| LMArena French | — | 1305 |
| LMArena Korean | — | 1192 |
| LMArena Spanish | — | 1315 |
Instruction Following Yi-Lightning leads
C4ai Aya Expanse 8b: 60.1 (#253), Yi-Lightning: 67.4 (#196)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1155 | 1278 |
Long Context Yi-Lightning leads
C4ai Aya Expanse 8b: 36.1 (#236), Yi-Lightning: 39.4 (#181)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1191 | 1297 |
Writing & Preference Yi-Lightning leads
C4ai Aya Expanse 8b: 39.0 (#250), Yi-Lightning: 50.2 (#184)
| Benchmark | C4ai Aya Expanse 8b | Yi-Lightning |
|---|---|---|
| LMArena Text | 1185 | 1302 |
| LMArena Creative Writing | 1168 | 1280 |
| LMArena Multi-Turn | 1160 | 1311 |
Frequently asked questions
Is C4ai Aya Expanse 8b better than Yi-Lightning?
Yi-Lightning is the stronger model overall, scoring 37.1 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or Yi-Lightning better for coding?
C4ai Aya Expanse 8b scores higher on coding benchmarks: 33.8 versus 27.4 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and Yi-Lightning share?
14 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Yi-Lightning has 18.