# C4ai Aya Expanse 8b vs MiMo-V2.5

> MiMo-V2.5 is the stronger model overall, scoring 43.4 to 34.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-mimo-v2-5
- Last updated: 2026-10-10
- Shared benchmarks: 14

## Summary

- They share 14 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 0 categories and MiMo-V2.5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where MiMo-V2.5 leads 61.6 to 39.0.

## Snapshot

| | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| Provider | Cohere | Xiaomi |
| Noometry Index | 34.9 | 43.4 |
| Rank | 229 | 93 |
| Context | — | 1.05M |
| Input $/M | — | $0.14 |
| Output $/M | — | $0.28 |
| Weights | Open | Open |

## Coding

- C4ai Aya Expanse 8b: 33.8 (#252)
- MiMo-V2.5: 43.9 (#81)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Coding | 1160 | 1469 |
| LMArena WebDev | — | 1438 |
| SciCode | — | 43.1% |
| ALE-Bench | — | 513.95 |

## Reasoning

- C4ai Aya Expanse 8b: 22.4 (#197)
- MiMo-V2.5: 28.6 (#101)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1450 |
| CritPt | — | 3.7% |

## Math

- C4ai Aya Expanse 8b: 33.3 (#203)
- MiMo-V2.5: 36.8 (#163)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Math | 1168 | 1436 |
| ProofBench | — | 16% |

## Knowledge

- C4ai Aya Expanse 8b: 33.6 (#201)
- MiMo-V2.5: 40.8 (#115)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | 1153 | 1460 |
| Vectara Hallucination Rate | 9.5% | — |

## Multimodal

- C4ai Aya Expanse 8b: —
- MiMo-V2.5: 39.8 (#54)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | — | 1247 |

## Multilingual

- C4ai Aya Expanse 8b: 36.1 (#242)
- MiMo-V2.5: 51.9 (#99)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | 1180 | 1404 |
| LMArena Chinese | 1181 | 1468 |
| LMArena German | 1188 | 1421 |
| LMArena Japanese | 1120 | 1306 |
| LMArena Russian | 1197 | 1395 |
| LMArena French | — | 1447 |
| LMArena Korean | — | 1363 |
| LMArena Spanish | — | 1416 |

## Instruction Following

- C4ai Aya Expanse 8b: 60.1 (#253)
- MiMo-V2.5: 75.5 (#60)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | 1155 | 1434 |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#236)
- MiMo-V2.5: 44.2 (#73)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | 1191 | 1445 |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.0 (#250)
- MiMo-V2.5: 61.6 (#86)

| Benchmark | C4ai Aya Expanse 8b | MiMo-V2.5 |
|---|---|---|
| LMArena Text | 1185 | 1428 |
| LMArena Creative Writing | 1168 | 1393 |
| LMArena Multi-Turn | 1160 | 1445 |

## FAQ

### Is C4ai Aya Expanse 8b better than MiMo-V2.5?

MiMo-V2.5 is the stronger model overall, scoring 43.4 to 34.9 on the Noometry Index.

### Is C4ai Aya Expanse 8b or MiMo-V2.5 better for coding?

MiMo-V2.5 scores higher on coding benchmarks: 43.9 versus 33.8 in the Noometry coding category.

### How many benchmarks do C4ai Aya Expanse 8b and MiMo-V2.5 share?

14 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and MiMo-V2.5 has 23.