# Gemma 3 12B vs GPT-5.3 Chat

> GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 32.1 on the Noometry Index. Gemma 3 12B costs 64× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemma-3-12b-vs-gpt-5-3-chat
- Last updated: 2026-10-12
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. Gemma 3 12B scores higher in 0 categories and GPT-5.3 Chat in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 22.3.
- Gemma 3 12B is cheaper at $0.05 / $0.15 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Gemma 3 12B accepts more context: 131K tokens versus 128K.
- Gemma 3 12B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 32.1 | 42.8 |
| Rank | 262 | 109 |
| Context | 131K | 128K |
| Input $/M | $0.05 | $1.75 |
| Output $/M | $0.15 | $14 |
| Weights | Open | Proprietary |

## Coding

- Gemma 3 12B: 31.7 (#280)
- GPT-5.3 Chat: 41.4 (#124)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1281 | 1408 |
| SciCode | 17.4% | — |

## Agentic & Tool Use

- Gemma 3 12B: 25.5 (#108)
- GPT-5.3 Chat: —

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| Berkeley Function Calling Leaderboard | 30.4% | — |

## Reasoning

- Gemma 3 12B: 15.7 (#313)
- GPT-5.3 Chat: 28.5 (#102)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1309 | 1399 |
| CritPt | 0% | — |
| Chess Puzzles | 0% | — |
| DTBench | 48.8% | — |
| LMCA | 4.5% | — |
| Epoch Capabilities Index | 123.5 | — |

## Math

- Gemma 3 12B: 22.3 (#279)
- GPT-5.3 Chat: 38.2 (#142)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1307 | 1389 |
| OTIS Mock AIME 2024-2025 | 16.7% | — |

## Knowledge

- Gemma 3 12B: 26.5 (#257)
- GPT-5.3 Chat: 38.8 (#140)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1248 | 1397 |
| GPQA Diamond | 39.5% | — |
| Vectara Hallucination Rate | 4.4% | — |

## Multimodal

- Gemma 3 12B: —
- GPT-5.3 Chat: —

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| MindCube | 46.7% | — |

## Multilingual

- Gemma 3 12B: 45.7 (#165)
- GPT-5.3 Chat: 50.3 (#124)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1318 | 1382 |
| LMArena German | 1370 | 1384 |
| LMArena Russian | 1335 | 1400 |
| LMArena Chinese | — | 1432 |
| LMArena French | — | 1397 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1346 |
| LMArena Spanish | — | 1371 |

## Instruction Following

- Gemma 3 12B: 68.6 (#186)
- GPT-5.3 Chat: 72.8 (#129)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1299 | 1378 |

## Long Context

- Gemma 3 12B: 40.0 (#162)
- GPT-5.3 Chat: 42.6 (#120)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1317 | 1396 |

## Writing & Preference

- Gemma 3 12B: 47.5 (#209)
- GPT-5.3 Chat: 63.1 (#68)

| Benchmark | Gemma 3 12B | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1334 | 1389 |
| LMArena Creative Writing | 1331 | 1355 |
| EQ-Bench Creative Writing | 1126 | 1690 |
| LMArena Multi-Turn | 1334 | 1412 |

## FAQ

### Is Gemma 3 12B better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 32.1 on the Noometry Index. Gemma 3 12B costs 64× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

### Which is cheaper, Gemma 3 12B or GPT-5.3 Chat?

Gemma 3 12B is cheaper. It lists at $0.05 per million input tokens and $0.15 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is Gemma 3 12B or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 31.7 in the Noometry coding category.

### Which has the bigger context window?

Gemma 3 12B does, with 131K tokens against 128K.

### How many benchmarks do Gemma 3 12B and GPT-5.3 Chat share?

13 benchmarks have published results for both models. Gemma 3 12B has 24 scored results on Noometry and GPT-5.3 Chat has 18.