# Gemma 2 27B vs o3-pro

> o3-pro is the stronger model overall, scoring 42.7 to 29.2 on the Noometry Index. Gemma 2 27B costs 54× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemma-2-27b-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 4

## Summary

- They share 4 benchmarks with published results for both. Gemma 2 27B scores higher in 0 categories and o3-pro in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.1 to 37.3.
- The biggest single-benchmark swing is DTBench: 48% for Gemma 2 27B and 86.9% for o3-pro.
- Gemma 2 27B is cheaper at $0.65 / $0.65 per million input/output tokens, against $20 / $80 for o3-pro.
- o3-pro accepts more context: 200K tokens versus 8K.
- Gemma 2 27B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 2 27B | o3-pro |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 29.2 | 42.7 |
| Rank | 302 | 94 |
| Context | 8K | 200K |
| Input $/M | $0.65 | $20 |
| Output $/M | $0.65 | $80 |
| Weights | Open | Proprietary |

## Coding

- Gemma 2 27B: 33.5 (#243)
- o3-pro: 55.1 (#22)

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
| BigCodeBench Instruct | 42.8% | — |
| LiveBench Coding | 36% | — |
| LMArena Coding | 1211 | — |
| BigCodeBench Complete | 52.5% | — |

## Reasoning

- Gemma 2 27B: 14.8 (#313)
- o3-pro: 24.1 (#152)

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| DTBench | 48% | 86.9% |
| LMCA | 7.1% | 38.5% |
| Epoch Capabilities Index | 122.06 | 147.43 |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| LiveBench Reasoning | 28.1% | — |
| LMArena Hard Prompts | 1199 | — |
| LiveBench Data Analysis | 47.9% | — |
| LiveBench | 38.2% | — |

## Math

- Gemma 2 27B: 10.0 (#306)
- o3-pro: —

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.4% | — |
| LiveBench Math | 26.5% | — |
| LMArena Math | 1212 | — |
| MATH Level 5 | 27.9% | — |

## Knowledge

- Gemma 2 27B: 18.9 (#275)
- o3-pro: 29.0 (#234)

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| Confabulations | 27.1% | 14.2% |
| GPQA Diamond | 36.5% | — |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1172 | — |
| MMLU | 75.7% | — |

## Multilingual

- Gemma 2 27B: 38.8 (#221)
- o3-pro: —

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| LMArena Non-English | 1217 | — |
| LMArena Chinese | 1221 | — |
| LMArena French | 1246 | — |
| LMArena German | 1209 | — |
| LMArena Japanese | 1175 | — |
| LMArena Korean | 1174 | — |
| LMArena Russian | 1234 | — |
| LMArena Spanish | 1228 | — |

## Instruction Following

- Gemma 2 27B: 60.7 (#244)
- o3-pro: —

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| LiveBench Instruction Following | 58.1% | — |
| LMArena Instruction Following | 1206 | — |

## Long Context

- Gemma 2 27B: 37.3 (#213)
- o3-pro: 72.1 (#1)

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1231 | — |

## Writing & Preference

- Gemma 2 27B: 44.4 (#220)
- o3-pro: 57.1 (#128)

| Benchmark | Gemma 2 27B | o3-pro |
|---|---|---|
| LMArena Text | 1231 | — |
| LMArena Creative Writing | 1241 | — |
| Short-Story Creative Writing | — | 84.4% |
| LMArena Multi-Turn | 1224 | — |
| LiveBench Language | 32.6% | — |

## FAQ

### Is Gemma 2 27B better than o3-pro?

o3-pro is the stronger model overall, scoring 42.7 to 29.2 on the Noometry Index. Gemma 2 27B costs 54× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

### Which is cheaper, Gemma 2 27B or o3-pro?

Gemma 2 27B is cheaper. It lists at $0.65 per million input tokens and $0.65 per million output tokens; o3-pro lists at $20 and $80.

### Is Gemma 2 27B or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 33.5 in the Noometry coding category.

### Which has the bigger context window?

o3-pro does, with 200K tokens against 8K.

### How many benchmarks do Gemma 2 27B and o3-pro share?

4 benchmarks have published results for both models. Gemma 2 27B has 34 scored results on Noometry and o3-pro has 12.