# C4ai Aya Expanse 8b vs o1

> o1 is the stronger model overall, scoring 40.9 to 34.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/c4ai-aya-expanse-8b-vs-o1
- 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 0 categories and o1 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where o1 leads 55.6 to 39.0.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.

## Snapshot

| | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| Provider | Cohere | OpenAI |
| Noometry Index | 34.9 | 40.9 |
| Rank | 229 | 143 |
| Context | — | 200K |
| Input $/M | — | $15 |
| Output $/M | — | $60 |
| Weights | Open | Proprietary |

## Coding

- C4ai Aya Expanse 8b: 33.8 (#252)
- o1: 46.1 (#70)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Coding | 1160 | 1367 |
| Aider Polyglot | — | 61.7% |
| WeirdML | — | 47.6% |
| LiveBench Coding | — | 69.7% |
| CadEval | — | 56% |
| HumanEval+ | — | 89% |
| MBPP+ | — | 80.2% |

## Agentic & Tool Use

- C4ai Aya Expanse 8b: —
- o1: 24.6 (#117)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| Cybench | — | 10% |
| METR Time Horizons | — | 51.1% |

## Reasoning

- C4ai Aya Expanse 8b: 22.4 (#197)
- o1: 27.9 (#111)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1371 |
| SimpleBench | — | 41.7% |
| ARC-AGI-1 | — | 30.7% |
| Chess Puzzles | — | 15% |
| EnigmaEval | — | 5.7% |
| LiveBench Reasoning | — | 91.6% |
| DTBench | — | 74.7% |
| LiveBench Data Analysis | — | 65.5% |
| LMCA | — | 22.3% |
| Epoch Capabilities Index | — | 141.91 |
| LiveBench | — | 75.7% |

## Math

- C4ai Aya Expanse 8b: 33.3 (#203)
- o1: 36.1 (#175)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Math | 1168 | 1388 |
| FrontierMath (Tiers 1-3) | — | 14.7% |
| OTIS Mock AIME 2024-2025 | — | 73.3% |
| LiveBench Math | — | 80.3% |
| MATH Level 5 | — | 94.7% |
| FrontierMath (Feb 2025 set) | — | 9.3% |

## Knowledge

- C4ai Aya Expanse 8b: 33.6 (#201)
- o1: 41.5 (#110)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Expert | 1153 | 1361 |
| GPQA Diamond | — | 76.8% |
| Humanity's Last Exam | — | 8% |
| SimpleQA Verified | — | 41.1% |
| Confabulations | — | 11.7% |
| Vectara Hallucination Rate | 9.5% | — |

## Multimodal

- C4ai Aya Expanse 8b: —
- o1: 34.2 (#93)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Vision | — | 1168 |
| GeoBench | — | 80% |
| VPCT | — | 37% |
| SpatialViz-Bench | — | 41.4% |

## Multilingual

- C4ai Aya Expanse 8b: 36.1 (#242)
- o1: 48.6 (#142)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Non-English | 1180 | 1358 |
| LMArena Chinese | 1181 | 1394 |
| LMArena German | 1188 | 1337 |
| LMArena Japanese | 1120 | 1346 |
| LMArena Russian | 1197 | 1356 |
| LMArena French | — | 1344 |
| LMArena Korean | — | 1396 |
| LMArena Spanish | — | 1345 |

## Instruction Following

- C4ai Aya Expanse 8b: 60.1 (#253)
- o1: 74.8 (#86)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Instruction Following | 1155 | 1367 |
| LiveBench Instruction Following | — | 81.5% |

## Long Context

- C4ai Aya Expanse 8b: 36.1 (#236)
- o1: 50.3 (#9)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Longer Query | 1191 | 1378 |
| Fiction.LiveBench | — | 83.3% |

## Writing & Preference

- C4ai Aya Expanse 8b: 39.0 (#250)
- o1: 55.6 (#144)

| Benchmark | C4ai Aya Expanse 8b | o1 |
|---|---|---|
| LMArena Text | 1185 | 1366 |
| LMArena Creative Writing | 1168 | 1348 |
| LMArena Multi-Turn | 1160 | 1369 |
| Short-Story Creative Writing | — | 70.2% |
| LiveBench Language | — | 65.4% |

## FAQ

### Is C4ai Aya Expanse 8b better than o1?

o1 is the stronger model overall, scoring 40.9 to 34.9 on the Noometry Index.

### Is C4ai Aya Expanse 8b or o1 better for coding?

o1 scores higher on coding benchmarks: 46.1 versus 33.8 in the Noometry coding category.

### How many benchmarks do C4ai Aya Expanse 8b and o1 share?

14 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and o1 has 52.