# C4ai Aya Expanse 8b vs StarCoder 2 15B

> C4ai Aya Expanse 8b has enough public results to be ranked (#227); StarCoder 2 15B does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-starcoder-2-15b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Snapshot

| | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| Provider | Cohere | NVIDIA |
| Noometry Index | 34.3 | 37.5 |
| Rank | 227 | — |
| Context | 8K | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- C4ai Aya Expanse 8b: 33.2 (#252)
- StarCoder 2 15B: 36.0

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Coding | 1161 | — |
| BigCodeBench Complete | — | 38.4% |
| HumanEval+ | — | 37.8% |

## Reasoning

- C4ai Aya Expanse 8b: 21.4 (#198)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Hard Prompts | 1156 | — |
| Epoch Capabilities Index | — | 104.61 |
| WinoGrande | — | 64.3% |

## Math

- C4ai Aya Expanse 8b: 30.8 (#204)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Math | 1168 | — |
| GSM8K | — | 57.7% |

## Knowledge

- C4ai Aya Expanse 8b: 33.0 (#197)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | — |
| LMArena Expert | 1153 | — |
| ARC (AI2) Challenge | — | 47.2% |
| MMLU | — | 64.1% |

## Multilingual

- C4ai Aya Expanse 8b: 36.3 (#237)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Non-English | 1180 | — |
| LMArena Chinese | 1181 | — |
| LMArena German | 1188 | — |
| LMArena Japanese | 1120 | — |
| LMArena Russian | 1197 | — |

## Instruction Following

- C4ai Aya Expanse 8b: 60.4 (#248)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Instruction Following | 1155 | — |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#231)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Longer Query | 1192 | — |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.2 (#245)
- StarCoder 2 15B: —

| Benchmark | C4ai Aya Expanse 8b | StarCoder 2 15B |
|---|---|---|
| LMArena Text | 1185 | — |
| LMArena Creative Writing | 1168 | — |
| LMArena Multi-Turn | 1160 | — |

## FAQ

### Is C4ai Aya Expanse 8b better than StarCoder 2 15B?

C4ai Aya Expanse 8b has enough public results to be ranked (#227); StarCoder 2 15B does not yet, so treat this comparison as directional.

### Is C4ai Aya Expanse 8b or StarCoder 2 15B better for coding?

StarCoder 2 15B scores higher on coding benchmarks: 36.0 versus 33.2 in the Noometry coding category.

### How many benchmarks do C4ai Aya Expanse 8b and StarCoder 2 15B share?

0 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and StarCoder 2 15B has 7.