# Gemini 2.5 Pro vs Mistral Small 3.1

> Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 8.6× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-2-5-pro-vs-mistral-small-3-1
- Last updated: 2026-10-10
- Shared benchmarks: 28

## Summary

- They share 28 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 9 categories and Mistral Small 3.1 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 2.5 Pro leads 55.8 to 22.6.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 84.7% for Gemini 2.5 Pro and 3.9% for Mistral Small 3.1.
- Mistral Small 3.1 is cheaper at $0.35 / $0.56 per million input/output tokens, against $1.25 / $10 for Gemini 2.5 Pro.
- Gemini 2.5 Pro accepts more context: 1.05M tokens versus 128K.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| Provider | Google | Mistral AI |
| Noometry Index | 44.9 | 31.4 |
| Rank | 67 | 263 |
| Context | 1.05M | 128K |
| Input $/M | $1.25 | $0.35 |
| Output $/M | $10 | $0.56 |
| Weights | Proprietary | Open |

## Coding

- Gemini 2.5 Pro: 42.8 (#86)
- Mistral Small 3.1: 37.7 (#175)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1452 | 1309 |
| SWE-bench Verified | 57.6% | — |
| SWE-bench Verified (bash only) | 53.6% | — |
| Aider Polyglot | 83.1% | — |
| LMArena WebDev | 1227 | — |
| SciCode | 42.8% | — |
| GSO | 3.9% | — |
| WeirdML | 54% | — |
| LiveBench Coding | 85.9% | — |
| CadEval | 64% | — |
| ALE-Bench | 785.52 | — |
| AlgoTune | 1.51 | — |

## Agentic & Tool Use

- Gemini 2.5 Pro: 29.1 (#81)
- Mistral Small 3.1: —

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| Terminal-Bench | 32.6% | — |
| GDPval | 23.3% | — |
| Remote Labor Index | 0.8% | — |
| TheAgentCompany | 30.3% | — |
| τ²-bench Banking | 13.7% | — |
| DeepResearch Bench | 42.8% | — |
| BALROG | 43.3% | — |
| LMArena Search | 1142 | — |
| METR Time Horizons | 55.4% | — |
| Vending-Bench 2 | 573.64 | — |

## Reasoning

- Gemini 2.5 Pro: 28.8 (#85)
- Mistral Small 3.1: 18.9 (#249)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| Chess Puzzles | 20% | 1% |
| LMArena Hard Prompts | 1455 | 1278 |
| Epoch Capabilities Index | 145.32 | 127.48 |
| ARC-AGI-2 | 4.9% | — |
| SimpleBench | 62.4% | — |
| Kagi LLM Benchmark | 70.3% | — |
| ARC-AGI-1 | 41% | — |
| CritPt | 2% | — |
| EnigmaEval | 5.6% | — |
| LiveBench Reasoning | 89.8% | — |
| DTBench | 82.4% | — |
| LiveBench Data Analysis | 79.9% | — |
| LMCA | 34.8% | — |
| ForecastBench | 61.3 | — |
| LiveBench | 82.3% | — |

## Math

- Gemini 2.5 Pro: 31.9 (#191)
- Mistral Small 3.1: 13.7 (#295)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 84.7% | 3.9% |
| Omni-MATH | 41.6% | 24.8% |
| LMArena Math | 1450 | 1261 |
| FrontierMath (Tiers 1-3) | 24.6% | — |
| FrontierMath Tier 4 | 0% | — |
| LiveBench Math | 90.2% | — |
| MATH Level 5 | 95.9% | — |
| FrontierMath (Feb 2025 set) | 14.1% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Gemini 2.5 Pro: 55.8 (#41)
- Mistral Small 3.1: 22.6 (#266)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | 85.3% | 41.9% |
| MMLU-Pro | 86.3% | 61% |
| GPQA (HELM) | 74.9% | 39.2% |
| LMArena Expert | 1452 | 1258 |
| Humanity's Last Exam | 21.6% | — |
| Confabulations | 10.6% | — |
| Vectara Hallucination Rate | 7% | — |

## Multimodal

- Gemini 2.5 Pro: 44.5 (#16)
- Mistral Small 3.1: 32.6 (#93)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | 1263 | 1136 |
| GeoBench | 86% | — |
| VPCT | 48% | — |
| LMArena Document | 1421 | — |
| SpatialViz-Bench | 44.7% | — |

## Multilingual

- Gemini 2.5 Pro: 55.5 (#30)
- Mistral Small 3.1: 41.4 (#204)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1452 | 1255 |
| LMArena Chinese | 1507 | 1254 |
| LMArena French | 1473 | 1270 |
| LMArena German | 1487 | 1266 |
| LMArena Japanese | 1462 | 1210 |
| LMArena Korean | 1435 | 1206 |
| LMArena Russian | 1460 | 1263 |
| LMArena Spanish | 1473 | 1283 |

## Instruction Following

- Gemini 2.5 Pro: 75.2 (#71)
- Mistral Small 3.1: 63.8 (#225)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| IFEval | 84% | 75% |
| LMArena Instruction Following | 1436 | 1264 |
| LiveBench Instruction Following | 80.6% | — |

## Long Context

- Gemini 2.5 Pro: 59.7 (#5)
- Mistral Small 3.1: 39.5 (#172)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1449 | 1300 |
| Fiction.LiveBench | 91.7% | — |

## Writing & Preference

- Gemini 2.5 Pro: 63.9 (#60)
- Mistral Small 3.1: 37.2 (#254)

| Benchmark | Gemini 2.5 Pro | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1458 | 1278 |
| LMArena Creative Writing | 1453 | 1253 |
| EQ-Bench Creative Writing | 1421 | 761 |
| WildBench | 85.7% | 78.8% |
| LMArena Multi-Turn | 1453 | 1270 |
| Short-Story Creative Writing | 83.8% | — |
| LiveBench Language | 67.8% | — |

## FAQ

### Is Gemini 2.5 Pro better than Mistral Small 3.1?

Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 8.6× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, Gemini 2.5 Pro or Mistral Small 3.1?

Mistral Small 3.1 is cheaper. It lists at $0.35 per million input tokens and $0.56 per million output tokens; Gemini 2.5 Pro lists at $1.25 and $10.

### Is Gemini 2.5 Pro or Mistral Small 3.1 better for coding?

Gemini 2.5 Pro scores higher on coding benchmarks: 42.8 versus 37.7 in the Noometry coding category.

### Which has the bigger context window?

Gemini 2.5 Pro does, with 1.05M tokens against 128K.

### How many benchmarks do Gemini 2.5 Pro and Mistral Small 3.1 share?

28 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and Mistral Small 3.1 has 28.