# Gemini 3.1 Pro Preview vs Gemma 2B

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 29.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-3-1-pro-preview-vs-gemma-2b
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 7 categories and Gemma 2B in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 18.8.
- Gemma 2B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| Provider | Google | Google |
| Noometry Index | 56.7 | 29.6 |
| Rank | 23 | 307 |
| Context | 1.05M | — |
| Input $/M | $2 | — |
| Output $/M | $12 | — |
| Weights | Proprietary | Open |

## Coding

- Gemini 3.1 Pro Preview: 42.5 (#99)
- Gemma 2B: 29.4 (#305)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Coding | 1484 | 1010 |
| SWE-bench Verified | 75.6% | — |
| DeepSWE | 11.7% | — |
| LMArena WebDev | 1447 | — |
| SciCode | 58.9% | — |
| GSO | 22.6% | — |
| WeirdML | 72.1% | — |
| MirrorCode | 8.9% | — |
| ALE-Bench | 1,161 | — |
| AlgoTune | 2.02 | — |
| HumanEval+ | — | 20.7% |
| MBPP+ | — | 34.1% |

## Agentic & Tool Use

- Gemini 3.1 Pro Preview: 37.7 (#34)
- Gemma 2B: —

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| Terminal-Bench | 80.2% | — |
| APEX-Agents | 35.3% | — |
| τ²-bench Banking | 26% | — |
| DeepResearch Bench | 47.8% | — |
| PostTrainBench | 22% | — |
| BALROG | 57% | — |
| ExploitBench | 26.1% | — |
| GBAEval | 0.8% | — |
| GDP.pdf | 17% | — |
| LMArena Search | 1211 | — |
| METR Time Horizons | 77% | — |
| Vending-Bench 2 | 3,774 | — |

## Reasoning

- Gemini 3.1 Pro Preview: 71.7 (#12)
- Gemma 2B: 18.8 (#275)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Hard Prompts | 1485 | 989 |
| Epoch Capabilities Index | 154.77 | 94.2 |
| ARC-AGI-2 | 77.1% | — |
| SimpleBench | 79.6% | — |
| NYT Connections (extended) | 97.4% | — |
| ARC-AGI-1 | 98% | — |
| CritPt | 17.7% | — |
| Chess Puzzles | 55% | — |
| EnigmaEval | 36.8% | — |
| Thematic Generalization | 79.4% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 34% | — |
| DTBench | 97.1% | — |
| LMCA | 53.8% | — |
| BIG-Bench Hard | — | 35.2% |
| ForecastBench | 59 | — |
| HellaSwag | — | 71.4% |
| PIQA | — | 77.3% |
| WinoGrande | — | 65.4% |

## Math

- Gemini 3.1 Pro Preview: 62.1 (#34)
- Gemma 2B: 30.0 (#239)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Math | 1485 | 1009 |
| FrontierMath (Tiers 1-3) | 59.6% | — |
| FrontierMath Tier 4 | 26.8% | — |
| MathArena Final-Answer Competitions | 86.5% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| ProofBench | 26% | — |
| FrontierMath (Feb 2025 set) | 36.9% | — |
| FrontierMath Tier 4 (v1) | 16.7% | — |
| GSM8K | — | 17.7% |

## Knowledge

- Gemini 3.1 Pro Preview: 71.8 (#3)
- Gemma 2B: —

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| GPQA Diamond | 94.4% | — |
| Humanity's Last Exam | 46.4% | — |
| SimpleQA Verified | 73.5% | — |
| Vectara Hallucination Rate | 10.4% | — |
| LMArena Expert | 1485 | — |
| ARC (AI2) Challenge | — | 42.1% |
| BoolQ | — | 69.4% |
| MMLU | — | 42.3% |
| TriviaQA | — | 53.2% |

## Multimodal

- Gemini 3.1 Pro Preview: 37.9 (#69)
- Gemma 2B: —

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Vision | 1296 | — |
| Blueprint-Bench 2 | 26.5% | — |
| Furniture Assembly | 26.7% | — |
| LMArena Document | 1444 | — |

## Multilingual

- Gemini 3.1 Pro Preview: 57.0 (#12)
- Gemma 2B: 23.0 (#294)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Non-English | 1477 | 958 |
| LMArena Chinese | 1529 | 986 |
| LMArena Russian | 1498 | 937 |
| LMArena French | 1487 | — |
| LMArena German | 1491 | — |
| LMArena Japanese | 1493 | — |
| LMArena Korean | 1455 | — |
| LMArena Spanish | 1479 | — |

## Instruction Following

- Gemini 3.1 Pro Preview: 77.0 (#32)
- Gemma 2B: 48.5 (#302)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Instruction Following | 1466 | 970 |

## Long Context

- Gemini 3.1 Pro Preview: 47.4 (#18)
- Gemma 2B: 29.9 (#291)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Longer Query | 1483 | 981 |
| CL-bench | 20.8% | — |
| CL-bench Life | 16.9% | — |

## Writing & Preference

- Gemini 3.1 Pro Preview: 66.1 (#37)
- Gemma 2B: 24.0 (#308)

| Benchmark | Gemini 3.1 Pro Preview | Gemma 2B |
|---|---|---|
| LMArena Text | 1481 | 1002 |
| LMArena Creative Writing | 1482 | 987 |
| LMArena Multi-Turn | 1488 | 945 |
| EQ-Bench Creative Writing | 1491 | — |
| EQ-Bench 4 | 1142 | — |

## FAQ

### Is Gemini 3.1 Pro Preview better than Gemma 2B?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 29.6 on the Noometry Index.

### Is Gemini 3.1 Pro Preview or Gemma 2B better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.5 versus 29.4 in the Noometry coding category.

### How many benchmarks do Gemini 3.1 Pro Preview and Gemma 2B share?

12 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Gemma 2B has 23.