# Gemma 4 31B IT vs GPT-5.3 Chat

> Gemma 4 31B IT and GPT-5.3 Chat score almost the same on the Noometry Index (43.5 vs 42.8), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gemma-4-31b-it-vs-gpt-5-3-chat
- Last updated: 2026-10-12
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. Gemma 4 31B IT scores higher in 5 categories and GPT-5.3 Chat in 3 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemma 4 31B IT leads 43.2 to 38.2.
- Gemma 4 31B IT is cheaper at $0.09 / $0.34 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Gemma 4 31B IT accepts more context: 262K tokens versus 128K.
- Gemma 4 31B IT has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 43.5 | 42.8 |
| Rank | 90 | 109 |
| Context | 262K | 128K |
| Input $/M | $0.09 | $1.75 |
| Output $/M | $0.34 | $14 |
| Weights | Open | Proprietary |

## Coding

- Gemma 4 31B IT: 42.3 (#108)
- GPT-5.3 Chat: 41.4 (#124)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1459 | 1408 |
| LMArena WebDev | 1366 | — |
| SciCode | 43.4% | — |
| WeirdML | 52.3% | — |
| ALE-Bench | 925.5 | — |

## Reasoning

- Gemma 4 31B IT: 27.2 (#122)
- GPT-5.3 Chat: 28.5 (#102)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1399 |
| Kagi LLM Benchmark | 63.5% | — |
| NYT Connections (extended) | 70.6% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 5% | — |
| Thematic Generalization | 53% | — |
| DTBench | 82.7% | — |
| LMCA | 39.3% | — |
| Surface Evolver Bench | 30.6% | — |
| Epoch Capabilities Index | 142.74 | — |

## Math

- Gemma 4 31B IT: 43.2 (#81)
- GPT-5.3 Chat: 38.2 (#142)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1465 | 1389 |
| OTIS Mock AIME 2024-2025 | 73.3% | — |

## Knowledge

- Gemma 4 31B IT: 37.9 (#151)
- GPT-5.3 Chat: 38.8 (#140)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1465 | 1397 |
| GPQA Diamond | 75.8% | — |
| SimpleQA Verified | 10.4% | — |
| Vectara Hallucination Rate | 7.4% | — |

## Multimodal

- Gemma 4 31B IT: 41.6 (#34)
- GPT-5.3 Chat: —

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Vision | 1277 | — |
| LMArena Document | 1425 | — |

## Multilingual

- Gemma 4 31B IT: 53.8 (#57)
- GPT-5.3 Chat: 50.3 (#124)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1431 | 1382 |
| LMArena Chinese | 1476 | 1432 |
| LMArena French | 1435 | 1397 |
| LMArena Russian | 1460 | 1400 |
| LMArena Spanish | 1444 | 1371 |
| LMArena German | — | 1384 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1346 |

## Instruction Following

- Gemma 4 31B IT: 75.5 (#61)
- GPT-5.3 Chat: 72.8 (#129)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1433 | 1378 |

## Long Context

- Gemma 4 31B IT: 44.2 (#71)
- GPT-5.3 Chat: 42.6 (#120)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1446 | 1396 |

## Writing & Preference

- Gemma 4 31B IT: 60.5 (#96)
- GPT-5.3 Chat: 63.1 (#68)

| Benchmark | Gemma 4 31B IT | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1443 | 1389 |
| LMArena Creative Writing | 1415 | 1355 |
| EQ-Bench Creative Writing | 1368 | 1690 |
| LMArena Multi-Turn | 1452 | 1412 |
| EQ-Bench 4 | 1120 | — |

## FAQ

### Is Gemma 4 31B IT better than GPT-5.3 Chat?

Gemma 4 31B IT and GPT-5.3 Chat score almost the same on the Noometry Index (43.5 vs 42.8), so choose on price, context window or the category you care about most.

### Which is cheaper, Gemma 4 31B IT or GPT-5.3 Chat?

Gemma 4 31B IT is cheaper. It lists at $0.09 per million input tokens and $0.34 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is Gemma 4 31B IT or GPT-5.3 Chat better for coding?

They score almost the same on coding (42.3 vs 41.4); test both on your own repository before choosing.

### Which has the bigger context window?

Gemma 4 31B IT does, with 262K tokens against 128K.

### How many benchmarks do Gemma 4 31B IT and GPT-5.3 Chat share?

15 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and GPT-5.3 Chat has 18.