# C4ai Aya Expanse 8b vs Command R

> C4ai Aya Expanse 8b is the stronger model overall, scoring 34.3 to 31.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-command-r
- 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 7 categories and Command R in 1 category; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where C4ai Aya Expanse 8b leads 21.4 to 13.3.
- Command R accepts more context: 128K tokens versus 8K.

## Snapshot

| | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| Provider | Cohere | Cohere |
| Noometry Index | 34.3 | 31.0 |
| Rank | 227 | 267 |
| Context | 8K | 128K |
| Input $/M | — | $0.15 |
| Output $/M | — | $0.60 |
| Weights | Open | Open |

## Coding

- C4ai Aya Expanse 8b: 33.2 (#252)
- Command R: 28.8 (#301)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Coding | 1161 | 1170 |
| BigCodeBench Instruct | — | 37.1% |
| LiveBench Coding | — | 17.9% |
| BigCodeBench Complete | — | 45.2% |

## Reasoning

- C4ai Aya Expanse 8b: 21.4 (#198)
- Command R: 13.3 (#329)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1164 |
| LiveBench Reasoning | — | 21.9% |
| DTBench | — | 46.4% |
| LiveBench Data Analysis | — | 33.3% |
| LMCA | — | 9.2% |
| LiveBench | — | 27.5% |

## Math

- C4ai Aya Expanse 8b: 30.8 (#204)
- Command R: 25.8 (#244)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Math | 1168 | 1155 |
| LiveBench Math | — | 19.4% |

## Knowledge

- C4ai Aya Expanse 8b: 33.0 (#197)
- Command R: 30.5 (#219)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Expert | 1153 | 1138 |
| Vectara Hallucination Rate | 9.5% | — |
| MMLU | — | 65.2% |

## Multilingual

- C4ai Aya Expanse 8b: 36.3 (#237)
- Command R: 35.9 (#240)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Non-English | 1180 | 1174 |
| LMArena Chinese | 1181 | 1182 |
| LMArena German | 1188 | 1176 |
| LMArena Japanese | 1120 | 1143 |
| LMArena Russian | 1197 | 1174 |
| LMArena French | — | 1161 |
| LMArena Korean | — | 1162 |
| LMArena Spanish | — | 1150 |

## Instruction Following

- C4ai Aya Expanse 8b: 60.4 (#248)
- Command R: 58.3 (#256)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Instruction Following | 1155 | 1167 |
| LiveBench Instruction Following | — | 55.6% |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#231)
- Command R: 36.3 (#226)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Longer Query | 1192 | 1198 |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.2 (#245)
- Command R: 38.4 (#248)

| Benchmark | C4ai Aya Expanse 8b | Command R |
|---|---|---|
| LMArena Text | 1185 | 1187 |
| LMArena Creative Writing | 1168 | 1170 |
| LMArena Multi-Turn | 1160 | 1163 |
| LiveBench Language | — | 16.7% |

## FAQ

### Is C4ai Aya Expanse 8b better than Command R?

C4ai Aya Expanse 8b is the stronger model overall, scoring 34.3 to 31.0 on the Noometry Index.

### Is C4ai Aya Expanse 8b or Command R better for coding?

C4ai Aya Expanse 8b scores higher on coding benchmarks: 33.2 versus 28.8 in the Noometry coding category.

### Which has the bigger context window?

Command R does, with 128K tokens against 8K.

### How many benchmarks do C4ai Aya Expanse 8b and Command R share?

14 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Command R has 29.