# C4ai Aya Expanse 8b vs o3-mini

> o3-mini is the stronger model overall, scoring 36.7 to 34.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-o3-mini
- Last updated: 2026-10-12
- Shared benchmarks: 14

## Summary

- They share 14 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 3 categories and o3-mini in 5 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in instruction following, where o3-mini leads 75.1 to 60.1.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.

## Snapshot

| | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| Provider | Cohere | OpenAI |
| Noometry Index | 34.9 | 36.7 |
| Rank | 229 | 212 |
| Context | — | 200K |
| Input $/M | — | $1.10 |
| Output $/M | — | $4.40 |
| Weights | Open | Proprietary |

## Coding

- C4ai Aya Expanse 8b: 33.8 (#252)
- o3-mini: 40.8 (#132)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Coding | 1160 | 1378 |
| Aider Polyglot | — | 60.4% |
| SciCode | — | 39.8% |
| GSO | — | 1.3% |
| WeirdML | — | 43.7% |
| LiveBench Coding | — | 82.7% |
| CadEval | — | 54% |

## Agentic & Tool Use

- C4ai Aya Expanse 8b: —
- o3-mini: 29.6 (#84)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| Cybench | — | 22.5% |

## Reasoning

- C4ai Aya Expanse 8b: 22.4 (#197)
- o3-mini: 16.3 (#305)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1366 |
| ARC-AGI-2 | — | 3% |
| SimpleBench | — | 22.8% |
| ARC-AGI-1 | — | 34.5% |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 17% |
| LiveBench Reasoning | — | 89.6% |
| Mystery Game Puzzles | — | 7% |
| DTBench | — | 68.8% |
| LiveBench Data Analysis | — | 70.6% |
| LMCA | — | 19% |
| Epoch Capabilities Index | — | 140.34 |
| ForecastBench | — | 59.6 |
| LiveBench | — | 75.9% |

## Math

- C4ai Aya Expanse 8b: 33.3 (#203)
- o3-mini: 28.1 (#244)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Math | 1168 | 1396 |
| FrontierMath (Tiers 1-3) | — | 18.6% |
| FrontierMath Tier 4 | — | 0% |
| OTIS Mock AIME 2024-2025 | — | 76.9% |
| LiveBench Math | — | 77.3% |
| MATH Level 5 | — | 96.5% |
| FrontierMath (Feb 2025 set) | — | 12.4% |
| FrontierMath Tier 4 (v1) | — | 4.2% |

## Knowledge

- C4ai Aya Expanse 8b: 33.6 (#201)
- o3-mini: 38.3 (#146)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Expert | 1153 | 1364 |
| GPQA Diamond | — | 77% |
| SimpleQA Verified | — | 15.3% |
| Confabulations | — | 17.9% |
| Vectara Hallucination Rate | 9.5% | — |

## Multilingual

- C4ai Aya Expanse 8b: 36.1 (#242)
- o3-mini: 45.7 (#164)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Non-English | 1180 | 1319 |
| LMArena Chinese | 1181 | 1379 |
| LMArena German | 1188 | 1303 |
| LMArena Japanese | 1120 | 1286 |
| LMArena Russian | 1197 | 1304 |
| LMArena French | — | 1334 |
| LMArena Korean | — | 1314 |
| LMArena Spanish | — | 1321 |

## Instruction Following

- C4ai Aya Expanse 8b: 60.1 (#253)
- o3-mini: 75.1 (#72)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Instruction Following | 1155 | 1337 |
| LiveBench Instruction Following | — | 84.4% |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#236)
- o3-mini: 33.8 (#256)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Longer Query | 1191 | 1343 |
| Fiction.LiveBench | — | 50% |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.0 (#250)
- o3-mini: 50.3 (#182)

| Benchmark | C4ai Aya Expanse 8b | o3-mini |
|---|---|---|
| LMArena Text | 1185 | 1337 |
| LMArena Creative Writing | 1168 | 1286 |
| LMArena Multi-Turn | 1160 | 1320 |
| Short-Story Creative Writing | — | 61.7% |
| LiveBench Language | — | 50.7% |

## FAQ

### Is C4ai Aya Expanse 8b better than o3-mini?

o3-mini is the stronger model overall, scoring 36.7 to 34.9 on the Noometry Index.

### Is C4ai Aya Expanse 8b or o3-mini better for coding?

o3-mini scores higher on coding benchmarks: 40.8 versus 33.8 in the Noometry coding category.

### How many benchmarks do C4ai Aya Expanse 8b and o3-mini share?

14 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and o3-mini has 51.