# Gemma 3 12B vs GPT-5.5 Pro

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 32.1 on the Noometry Index. Gemma 3 12B costs 900× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemma-3-12b-vs-gpt-5-5-pro
- Last updated: 2026-10-12
- Shared benchmarks: 7

## Summary

- They share 7 benchmarks with published results for both. Gemma 3 12B scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 22.3.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.7% for Gemma 3 12B and 100% for GPT-5.5 Pro.
- Gemma 3 12B is cheaper at $0.05 / $0.15 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 131K.
- Gemma 3 12B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 32.1 | 64.3 |
| Rank | 262 | 8 |
| Context | 131K | 1.05M |
| Input $/M | $0.05 | $30 |
| Output $/M | $0.15 | $180 |
| Weights | Open | Proprietary |

## Coding

- Gemma 3 12B: 31.7 (#280)
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| SciCode | 17.4% | — |
| LMArena Coding | 1281 | — |

## Agentic & Tool Use

- Gemma 3 12B: 25.5 (#108)
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| Berkeley Function Calling Leaderboard | 30.4% | — |

## Reasoning

- Gemma 3 12B: 15.7 (#313)
- GPT-5.5 Pro: 73.3 (#10)

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| CritPt | 0% | 30.6% |
| Chess Puzzles | 0% | 64% |
| DTBench | 48.8% | 96% |
| LMCA | 4.5% | 53.9% |
| Epoch Capabilities Index | 123.5 | 162.07 |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| LMArena Hard Prompts | 1309 | — |

## Math

- Gemma 3 12B: 22.3 (#279)
- GPT-5.5 Pro: 84.0 (#10)

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.7% | 100% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| LMArena Math | 1307 | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |

## Knowledge

- Gemma 3 12B: 26.5 (#257)
- GPT-5.5 Pro: 64.1 (#19)

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 39.5% | 93.9% |
| Vectara Hallucination Rate | 4.4% | — |
| LMArena Expert | 1248 | — |

## Multimodal

- Gemma 3 12B: —
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| MindCube | 46.7% | — |

## Multilingual

- Gemma 3 12B: 45.7 (#165)
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1318 | — |
| LMArena German | 1370 | — |
| LMArena Russian | 1335 | — |

## Instruction Following

- Gemma 3 12B: 68.6 (#186)
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1299 | — |

## Long Context

- Gemma 3 12B: 40.0 (#162)
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1317 | — |

## Writing & Preference

- Gemma 3 12B: 47.5 (#209)
- GPT-5.5 Pro: —

| Benchmark | Gemma 3 12B | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1334 | — |
| LMArena Creative Writing | 1331 | — |
| EQ-Bench Creative Writing | 1126 | — |
| LMArena Multi-Turn | 1334 | — |

## FAQ

### Is Gemma 3 12B better than GPT-5.5 Pro?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 32.1 on the Noometry Index. Gemma 3 12B costs 900× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, Gemma 3 12B or GPT-5.5 Pro?

Gemma 3 12B is cheaper. It lists at $0.05 per million input tokens and $0.15 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 131K.

### How many benchmarks do Gemma 3 12B and GPT-5.5 Pro share?

7 benchmarks have published results for both models. Gemma 3 12B has 24 scored results on Noometry and GPT-5.5 Pro has 14.