# C4ai Aya Expanse 8b vs Mistral Medium

> Mistral Medium is the stronger model overall, scoring 36.3 to 34.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-mistral-medium
- Last updated: 2026-10-10
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 2 categories and Mistral Medium in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Mistral Medium leads 60.0 to 39.0.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 9.5% for C4ai Aya Expanse 8b and 22.7% for Mistral Medium.

## Snapshot

| | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| Provider | Cohere | Mistral AI |
| Noometry Index | 34.9 | 36.3 |
| Rank | 229 | 218 |
| Context | — | 262K |
| Input $/M | — | $1.50 |
| Output $/M | — | $7.50 |
| Weights | Open | Open |

## Coding

- C4ai Aya Expanse 8b: 33.8 (#252)
- Mistral Medium: 34.2 (#243)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Coding | 1160 | 1434 |
| FrontierCode | — | 8% |
| SciCode | — | 40.2% |
| WeirdML | — | 43.7% |
| ALE-Bench | — | 763.98 |

## Agentic & Tool Use

- C4ai Aya Expanse 8b: —
- Mistral Medium: 28.3 (#90)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 37.7% |

## Reasoning

- C4ai Aya Expanse 8b: 22.4 (#197)
- Mistral Medium: 24.0 (#167)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1426 |
| Kagi LLM Benchmark | — | 50% |
| CritPt | — | 0% |
| DTBench | — | 75.5% |
| LMCA | — | 26.1% |
| Surface Evolver Bench | — | 26.9% |

## Math

- C4ai Aya Expanse 8b: 33.3 (#203)
- Mistral Medium: 28.1 (#245)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Math | 1168 | 1408 |
| OTIS Mock AIME 2024-2025 | — | 32.2% |
| ProofBench | — | 9% |
| MATH Level 5 | — | 81.6% |
| FrontierMath (Feb 2025 set) | — | 0.3% |

## Knowledge

- C4ai Aya Expanse 8b: 33.6 (#201)
- Mistral Medium: 25.0 (#265)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | 22.7% |
| LMArena Expert | 1153 | 1408 |
| GPQA Diamond | — | 59.5% |
| Humanity's Last Exam | — | 4.5% |

## Multimodal

- C4ai Aya Expanse 8b: —
- Mistral Medium: 35.3 (#88)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Vision | — | 1172 |

## Multilingual

- C4ai Aya Expanse 8b: 36.1 (#242)
- Mistral Medium: 52.1 (#91)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Non-English | 1180 | 1408 |
| LMArena Chinese | 1181 | 1447 |
| LMArena German | 1188 | 1432 |
| LMArena Japanese | 1120 | 1378 |
| LMArena Russian | 1197 | 1411 |
| LMArena French | — | 1459 |
| LMArena Korean | — | 1380 |
| LMArena Spanish | — | 1433 |

## Instruction Following

- C4ai Aya Expanse 8b: 60.1 (#253)
- Mistral Medium: 73.7 (#116)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Instruction Following | 1155 | 1398 |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#236)
- Mistral Medium: 42.9 (#114)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Longer Query | 1191 | 1406 |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.0 (#250)
- Mistral Medium: 60.0 (#103)

| Benchmark | C4ai Aya Expanse 8b | Mistral Medium |
|---|---|---|
| LMArena Text | 1185 | 1424 |
| LMArena Creative Writing | 1168 | 1391 |
| LMArena Multi-Turn | 1160 | 1418 |
| Short-Story Creative Writing | — | 77.3% |

## FAQ

### Is C4ai Aya Expanse 8b better than Mistral Medium?

Mistral Medium is the stronger model overall, scoring 36.3 to 34.9 on the Noometry Index.

### Is C4ai Aya Expanse 8b or Mistral Medium better for coding?

They score almost the same on coding (33.8 vs 34.2); test both on your own repository before choosing.

### How many benchmarks do C4ai Aya Expanse 8b and Mistral Medium share?

15 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Mistral Medium has 36.