# C4ai Aya Expanse 32b vs Mercury 2

> Mercury 2 is the stronger model overall, scoring 39.1 to 35.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-32b-vs-mercury-2
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. C4ai Aya Expanse 32b scores higher in 1 category and Mercury 2 in 6 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Mercury 2 leads 53.8 to 42.2.
- C4ai Aya Expanse 32b has downloadable open weights; the other is API-only.

## Snapshot

| | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| Provider | Cohere | Inception |
| Noometry Index | 35.9 | 39.1 |
| Rank | 221 | 175 |
| Context | 128K | 128K |
| Input $/M | — | $0.25 |
| Output $/M | — | $0.75 |
| Weights | Open | Proprietary |

## Coding

- C4ai Aya Expanse 32b: 34.8 (#231)
- Mercury 2: 33.5 (#255)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Coding | 1197 | 1391 |
| LMArena WebDev | — | 1171 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |

## Reasoning

- C4ai Aya Expanse 32b: 23.3 (#180)
- Mercury 2: 23.8 (#170)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1193 | 1362 |
| CritPt | — | 0.8% |

## Math

- C4ai Aya Expanse 32b: 34.0 (#197)
- Mercury 2: —

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Math | 1200 | — |

## Knowledge

- C4ai Aya Expanse 32b: 33.2 (#206)
- Mercury 2: 36.2 (#172)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| Vectara Hallucination Rate | 10.9% | 12.3% |
| LMArena Expert | 1182 | 1358 |

## Multilingual

- C4ai Aya Expanse 32b: 38.4 (#230)
- Mercury 2: 46.6 (#157)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1213 | 1331 |
| LMArena Chinese | 1211 | 1417 |
| LMArena Russian | 1227 | 1304 |
| LMArena French | 1248 | — |
| LMArena German | 1199 | — |
| LMArena Japanese | 1163 | — |
| LMArena Korean | 1158 | — |
| LMArena Spanish | 1193 | — |

## Instruction Following

- C4ai Aya Expanse 32b: 62.6 (#237)
- Mercury 2: 70.2 (#165)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1196 | 1329 |

## Long Context

- C4ai Aya Expanse 32b: 37.2 (#220)
- Mercury 2: 40.5 (#154)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1228 | 1330 |

## Writing & Preference

- C4ai Aya Expanse 32b: 42.2 (#235)
- Mercury 2: 53.8 (#155)

| Benchmark | C4ai Aya Expanse 32b | Mercury 2 |
|---|---|---|
| LMArena Text | 1224 | 1355 |
| LMArena Creative Writing | 1200 | 1289 |
| LMArena Multi-Turn | 1190 | 1358 |

## FAQ

### Is C4ai Aya Expanse 32b better than Mercury 2?

Mercury 2 is the stronger model overall, scoring 39.1 to 35.9 on the Noometry Index.

### Is C4ai Aya Expanse 32b or Mercury 2 better for coding?

C4ai Aya Expanse 32b scores higher on coding benchmarks: 34.8 versus 33.5 in the Noometry coding category.

### Which has the bigger context window?

Both accept 128K tokens.

### How many benchmarks do C4ai Aya Expanse 32b and Mercury 2 share?

12 benchmarks have published results for both models. C4ai Aya Expanse 32b has 18 scored results on Noometry and Mercury 2 has 17.