# Amazon Nova Micro vs C4ai Aya Expanse 8b

> C4ai Aya Expanse 8b is the stronger model overall, scoring 34.3 to 29.9 on the Noometry Index.

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

## Summary

- They share 15 benchmarks with published results for both. Amazon Nova Micro scores higher in 3 categories and C4ai Aya Expanse 8b in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where C4ai Aya Expanse 8b leads 30.8 to 24.9.
- Amazon Nova Micro accepts more context: 128K tokens versus 8K.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.

## Snapshot

| | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| Provider | Amazon | Cohere |
| Noometry Index | 29.9 | 34.3 |
| Rank | 290 | 227 |
| Context | 128K | 8K |
| Input $/M | $0.035 | — |
| Output $/M | $0.14 | — |
| Weights | Proprietary | Open |

## Coding

- Amazon Nova Micro: 30.0 (#289)
- C4ai Aya Expanse 8b: 33.2 (#252)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Coding | 1218 | 1161 |
| LiveBench Coding | 20.2% | — |

## Agentic & Tool Use

- Amazon Nova Micro: 21.9 (#125)
- C4ai Aya Expanse 8b: —

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| Berkeley Function Calling Leaderboard | 22.3% | — |

## Reasoning

- Amazon Nova Micro: 16.7 (#289)
- C4ai Aya Expanse 8b: 21.4 (#198)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Hard Prompts | 1191 | 1156 |
| LiveBench Reasoning | 25.1% | — |
| LiveBench Data Analysis | 34% | — |
| LiveBench | 29.6% | — |

## Math

- Amazon Nova Micro: 24.9 (#252)
- C4ai Aya Expanse 8b: 30.8 (#204)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Math | 1206 | 1168 |
| Omni-MATH | 21.4% | — |
| LiveBench Math | 34.5% | — |

## Knowledge

- Amazon Nova Micro: 29.2 (#231)
- C4ai Aya Expanse 8b: 33.0 (#197)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| Vectara Hallucination Rate | 5.5% | 9.5% |
| LMArena Expert | 1184 | 1153 |
| MMLU-Pro | 51.1% | — |
| GPQA (HELM) | 38.3% | — |
| MMLU | 70.8% | — |

## Multilingual

- Amazon Nova Micro: 36.7 (#234)
- C4ai Aya Expanse 8b: 36.3 (#237)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Non-English | 1186 | 1180 |
| LMArena Chinese | 1209 | 1181 |
| LMArena German | 1192 | 1188 |
| LMArena Japanese | 1154 | 1120 |
| LMArena Russian | 1185 | 1197 |
| LMArena French | 1237 | — |
| LMArena Korean | 1150 | — |
| LMArena Spanish | 1225 | — |

## Instruction Following

- Amazon Nova Micro: 56.6 (#267)
- C4ai Aya Expanse 8b: 60.4 (#248)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Instruction Following | 1174 | 1155 |
| LiveBench Instruction Following | 48% | — |
| IFEval | 76% | — |

## Long Context

- Amazon Nova Micro: 36.5 (#224)
- C4ai Aya Expanse 8b: 36.1 (#231)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Longer Query | 1206 | 1192 |

## Writing & Preference

- Amazon Nova Micro: 39.7 (#242)
- C4ai Aya Expanse 8b: 39.2 (#245)

| Benchmark | Amazon Nova Micro | C4ai Aya Expanse 8b |
|---|---|---|
| LMArena Text | 1208 | 1185 |
| LMArena Creative Writing | 1172 | 1168 |
| LMArena Multi-Turn | 1178 | 1160 |
| WildBench | 74.3% | — |
| LiveBench Language | 15.8% | — |

## FAQ

### Is Amazon Nova Micro better than C4ai Aya Expanse 8b?

C4ai Aya Expanse 8b is the stronger model overall, scoring 34.3 to 29.9 on the Noometry Index.

### Is Amazon Nova Micro or C4ai Aya Expanse 8b better for coding?

C4ai Aya Expanse 8b scores higher on coding benchmarks: 33.2 versus 30.0 in the Noometry coding category.

### Which has the bigger context window?

Amazon Nova Micro does, with 128K tokens against 8K.

### How many benchmarks do Amazon Nova Micro and C4ai Aya Expanse 8b share?

15 benchmarks have published results for both models. Amazon Nova Micro has 32 scored results on Noometry and C4ai Aya Expanse 8b has 15.