# C4ai Aya Expanse 8b vs Molmo 2 8b

> Molmo 2 8b is the stronger model overall, scoring 39.1 to 34.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-molmo-2-8b
- Last updated: 2026-10-10
- Shared benchmarks: 4

## Summary

- They share 4 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 0 categories and Molmo 2 8b in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Molmo 2 8b leads 49.4 to 39.0.

## Snapshot

| | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| Provider | Cohere | Allen Institute for AI (Ai2) |
| Noometry Index | 34.9 | 39.1 |
| Rank | 229 | 174 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- C4ai Aya Expanse 8b: 33.8 (#252)
- Molmo 2 8b: —

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Coding | 1160 | — |

## Reasoning

- C4ai Aya Expanse 8b: 22.4 (#197)
- Molmo 2 8b: 25.6 (#146)

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1287 |

## Math

- C4ai Aya Expanse 8b: 33.3 (#203)
- Molmo 2 8b: —

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Math | 1168 | — |

## Knowledge

- C4ai Aya Expanse 8b: 33.6 (#201)
- Molmo 2 8b: —

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | — |
| LMArena Expert | 1153 | — |

## Multimodal

- C4ai Aya Expanse 8b: —
- Molmo 2 8b: 30.2 (#112)

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Vision | — | 1081 |

## Multilingual

- C4ai Aya Expanse 8b: 36.1 (#242)
- Molmo 2 8b: 42.7 (#190)

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Non-English | 1180 | 1276 |
| LMArena Chinese | 1181 | — |
| LMArena German | 1188 | — |
| LMArena Japanese | 1120 | — |
| LMArena Russian | 1197 | — |

## Instruction Following

- C4ai Aya Expanse 8b: 60.1 (#253)
- Molmo 2 8b: 67.0 (#201)

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Instruction Following | 1155 | 1270 |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#236)
- Molmo 2 8b: —

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Longer Query | 1191 | — |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.0 (#250)
- Molmo 2 8b: 49.4 (#191)

| Benchmark | C4ai Aya Expanse 8b | Molmo 2 8b |
|---|---|---|
| LMArena Text | 1185 | 1288 |
| LMArena Creative Writing | 1168 | — |
| LMArena Multi-Turn | 1160 | — |

## FAQ

### Is C4ai Aya Expanse 8b better than Molmo 2 8b?

Molmo 2 8b is the stronger model overall, scoring 39.1 to 34.9 on the Noometry Index.

### How many benchmarks do C4ai Aya Expanse 8b and Molmo 2 8b share?

4 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Molmo 2 8b has 5.