# Gemma 3 4B vs o3-pro

> o3-pro is the stronger model overall, scoring 42.9 to 28.1 on the Noometry Index. Gemma 3 4B costs 700× 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-3-4b-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 5

## Summary

- They share 5 benchmarks with published results for both. Gemma 3 4B 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 72.2 to 38.7.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 25.2% for Gemma 3 4B and 72.1% for o3-pro.
- Gemma 3 4B is cheaper at $0.04 / $0.08 per million input/output tokens, against $20 / $80 for o3-pro.
- o3-pro accepts more context: 200K tokens versus 131K.
- Gemma 3 4B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 3 4B | o3-pro |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 28.1 | 42.9 |
| Rank | 326 | 105 |
| Context | 131K | 200K |
| Input $/M | $0.04 | $20 |
| Output $/M | $0.08 | $80 |
| Weights | Open | Proprietary |

## Coding

- Gemma 3 4B: 35.9 (#215)
- o3-pro: 55.5 (#24)

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
| LMArena Coding | 1230 | — |

## Agentic & Tool Use

- Gemma 3 4B: 20.9 (#142)
- o3-pro: —

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| Berkeley Function Calling Leaderboard | 19.6% | — |

## Reasoning

- Gemma 3 4B: 13.2 (#335)
- o3-pro: 23.8 (#171)

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| Kagi LLM Benchmark | 25.2% | 72.1% |
| DTBench | 50.9% | 86.9% |
| LMCA | 2.8% | 38.5% |
| Epoch Capabilities Index | 116.02 | 147.42 |
| ARC-AGI-2 | — | 4.9% |
| ARC-AGI-1 | — | 59.3% |
| Chess Puzzles | 0% | — |
| LMArena Hard Prompts | 1253 | — |

## Math

- Gemma 3 4B: 16.8 (#292)
- o3-pro: —

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 7.5% | — |
| LMArena Math | 1239 | — |

## Knowledge

- Gemma 3 4B: 11.8 (#299)
- o3-pro: 29.5 (#238)

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| Vectara Hallucination Rate | 6.4% | 23.3% |
| GPQA Diamond | 23.2% | — |
| Confabulations | — | 14.2% |
| LMArena Expert | 1223 | — |

## Multilingual

- Gemma 3 4B: 42.5 (#194)
- o3-pro: —

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| LMArena Non-English | 1273 | — |
| LMArena German | 1281 | — |
| LMArena Russian | 1294 | — |

## Instruction Following

- Gemma 3 4B: 65.2 (#225)
- o3-pro: —

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1239 | — |

## Long Context

- Gemma 3 4B: 38.7 (#194)
- o3-pro: 72.2 (#1)

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1273 | — |

## Writing & Preference

- Gemma 3 4B: 42.0 (#239)
- o3-pro: 57.1 (#133)

| Benchmark | Gemma 3 4B | o3-pro |
|---|---|---|
| LMArena Text | 1291 | — |
| LMArena Creative Writing | 1271 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1068 | — |
| LMArena Multi-Turn | 1255 | — |

## FAQ

### Is Gemma 3 4B better than o3-pro?

o3-pro is the stronger model overall, scoring 42.9 to 28.1 on the Noometry Index. Gemma 3 4B costs 700× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

### Which is cheaper, Gemma 3 4B or o3-pro?

Gemma 3 4B is cheaper. It lists at $0.04 per million input tokens and $0.08 per million output tokens; o3-pro lists at $20 and $80.

### Is Gemma 3 4B or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.5 versus 35.9 in the Noometry coding category.

### Which has the bigger context window?

o3-pro does, with 200K tokens against 131K.

### How many benchmarks do Gemma 3 4B and o3-pro share?

5 benchmarks have published results for both models. Gemma 3 4B has 22 scored results on Noometry and o3-pro has 12.