# Gemma 4 31B IT vs GPT-4.5

> Gemma 4 31B IT is the stronger model overall, scoring 43.2 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemma-4-31b-it-vs-gpt-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Gemma 4 31B IT scores higher in 9 categories and GPT-4.5 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemma 4 31B IT leads 26.4 to 14.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 73.3% for Gemma 4 31B IT and 37.8% for GPT-4.5.
- Gemma 4 31B IT has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 43.2 | 36.9 |
| Rank | 85 | 200 |
| Context | 262K | — |
| Input $/M | $0.09 | — |
| Output $/M | $0.34 | — |
| Weights | Open | Proprietary |

## Coding

- Gemma 4 31B IT: 41.9 (#98)
- GPT-4.5: 41.8 (#102)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| WeirdML | 52.3% | 39.4% |
| LMArena Coding | 1459 | 1397 |
| Aider Polyglot | — | 44.9% |
| LMArena WebDev | 1364 | — |
| SciCode | 43.4% | — |
| LiveBench Coding | — | 75.2% |
| ALE-Bench | 925.5 | — |

## Agentic & Tool Use

- Gemma 4 31B IT: —
- GPT-4.5: 27.6 (#92)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| Cybench | — | 17.5% |

## Reasoning

- Gemma 4 31B IT: 26.4 (#119)
- GPT-4.5: 14.1 (#320)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1404 |
| Epoch Capabilities Index | 142.74 | 136.74 |
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 34.5% |
| Kagi LLM Benchmark | 63.5% | — |
| NYT Connections (extended) | 70.6% | — |
| ARC-AGI-1 | — | 10.3% |
| CritPt | 1.4% | — |
| Chess Puzzles | 5% | — |
| EnigmaEval | — | 3.2% |
| Thematic Generalization | 53% | — |
| LiveBench Reasoning | — | 71.1% |
| DTBench | 82.7% | — |
| LiveBench Data Analysis | — | 64.3% |
| LMCA | 39.3% | — |
| Surface Evolver Bench | 30.6% | — |
| ForecastBench | — | 61.7 |
| LiveBench | — | 69% |

## Math

- Gemma 4 31B IT: 41.3 (#72)
- GPT-4.5: 31.0 (#200)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.3% | 37.8% |
| LMArena Math | 1464 | 1412 |
| LiveBench Math | — | 69.3% |
| MATH Level 5 | — | 78.6% |

## Knowledge

- Gemma 4 31B IT: 37.9 (#141)
- GPT-4.5: 32.4 (#205)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| GPQA Diamond | 75.8% | 68.7% |
| LMArena Expert | 1465 | 1394 |
| Humanity's Last Exam | — | 5.4% |
| SimpleQA Verified | 10.4% | — |
| Confabulations | — | 13.6% |
| Vectara Hallucination Rate | 7.4% | — |

## Multimodal

- Gemma 4 31B IT: 41.0 (#32)
- GPT-4.5: 37.0 (#68)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| LMArena Vision | 1278 | 1195 |
| VPCT | — | 45% |
| LMArena Document | 1425 | — |

## Multilingual

- Gemma 4 31B IT: 54.0 (#52)
- GPT-4.5: 52.7 (#78)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| LMArena Non-English | 1431 | 1413 |
| LMArena Chinese | 1478 | 1421 |
| LMArena French | 1436 | 1417 |
| LMArena Russian | 1462 | 1419 |
| LMArena German | — | 1457 |
| LMArena Japanese | — | 1416 |
| LMArena Korean | — | 1392 |
| LMArena Spanish | 1443 | — |

## Instruction Following

- Gemma 4 31B IT: 75.6 (#58)
- GPT-4.5: 72.8 (#129)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| LMArena Instruction Following | 1433 | 1404 |
| LiveBench Instruction Following | — | 72.3% |

## Long Context

- Gemma 4 31B IT: 44.2 (#67)
- GPT-4.5: 40.4 (#150)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| LMArena Longer Query | 1446 | 1406 |
| Fiction.LiveBench | — | 63.9% |

## Writing & Preference

- Gemma 4 31B IT: 60.7 (#92)
- GPT-4.5: 57.1 (#129)

| Benchmark | Gemma 4 31B IT | GPT-4.5 |
|---|---|---|
| LMArena Text | 1443 | 1417 |
| LMArena Creative Writing | 1416 | 1394 |
| EQ-Bench Creative Writing | 1368 | 1258 |
| LMArena Multi-Turn | 1452 | 1444 |
| Short-Story Creative Writing | — | 75.6% |
| EQ-Bench 4 | 1120 | — |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Gemma 4 31B IT better than GPT-4.5?

Gemma 4 31B IT is the stronger model overall, scoring 43.2 to 36.9 on the Noometry Index.

### Is Gemma 4 31B IT or GPT-4.5 better for coding?

They score almost the same on coding (41.9 vs 41.8); test both on your own repository before choosing.

### How many benchmarks do Gemma 4 31B IT and GPT-4.5 share?

19 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and GPT-4.5 has 42.