# Gemini 3.1 Pro Preview vs Mistral Medium 3.5

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 39.6 on the Noometry Index. Mistral Medium 3.5 costs 1.5× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-1-pro-preview-vs-mistral-medium-3-5
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 9 categories and Mistral Medium 3.5 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 16.6.
- The biggest single-benchmark swing is NYT Connections (extended): 97.4% for Gemini 3.1 Pro Preview and 12.9% for Mistral Medium 3.5.
- Mistral Medium 3.5 is cheaper at $1.50 / $7.50 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
- Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 262K.
- Mistral Medium 3.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| Provider | Google | Mistral AI |
| Noometry Index | 56.7 | 39.6 |
| Rank | 20 | 151 |
| Context | 1.05M | 262K |
| Input $/M | $2 | $1.50 |
| Output $/M | $12 | $7.50 |
| Weights | Proprietary | Open |

## Coding

- Gemini 3.1 Pro Preview: 42.7 (#88)
- Mistral Medium 3.5: 35.7 (#208)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena WebDev | 1446 | 1263 |
| LMArena Coding | 1483 | 1461 |
| SWE-bench Verified | 75.6% | — |
| DeepSWE | 11.7% | — |
| SciCode | 58.9% | — |
| GSO | 22.6% | — |
| WeirdML | 72.1% | — |
| MirrorCode | 8.9% | — |
| ALE-Bench | 1,161 | — |
| AlgoTune | 2.02 | — |

## Agentic & Tool Use

- Gemini 3.1 Pro Preview: 37.7 (#33)
- Mistral Medium 3.5: —

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| 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 (#9)
- Mistral Medium 3.5: 16.6 (#290)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| NYT Connections (extended) | 97.4% | 12.9% |
| LMArena Hard Prompts | 1484 | 1436 |
| Epoch Capabilities Index | 154.92 | 141.42 |
| ARC-AGI-2 | 77.1% | — |
| SimpleBench | 79.6% | — |
| Kagi LLM Benchmark | — | 41.4% |
| 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% | — |
| ForecastBench | 59 | — |

## Math

- Gemini 3.1 Pro Preview: 61.8 (#28)
- Mistral Medium 3.5: 36.4 (#113)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Math | 1485 | 1432 |
| 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% | — |

## Knowledge

- Gemini 3.1 Pro Preview: 71.8 (#3)
- Mistral Medium 3.5: 39.3 (#123)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Expert | 1484 | 1431 |
| GPQA Diamond | 94.4% | — |
| Humanity's Last Exam | 46.4% | — |
| SimpleQA Verified | 73.5% | — |
| Vectara Hallucination Rate | 10.4% | — |

## Multimodal

- Gemini 3.1 Pro Preview: 38.1 (#60)
- Mistral Medium 3.5: 37.6 (#64)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Vision | 1296 | 1222 |
| Blueprint-Bench 2 | 26.5% | — |
| Furniture Assembly | 26.7% | — |
| LMArena Document | 1444 | — |

## Multilingual

- Gemini 3.1 Pro Preview: 57.1 (#11)
- Mistral Medium 3.5: 52.1 (#93)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Non-English | 1475 | 1405 |
| LMArena Chinese | 1528 | 1443 |
| LMArena French | 1488 | 1448 |
| LMArena German | 1491 | 1453 |
| LMArena Korean | 1458 | 1387 |
| LMArena Russian | 1496 | 1396 |
| LMArena Spanish | 1480 | 1406 |
| LMArena Japanese | 1494 | — |

## Instruction Following

- Gemini 3.1 Pro Preview: 77.1 (#31)
- Mistral Medium 3.5: 74.7 (#87)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Instruction Following | 1465 | 1414 |

## Long Context

- Gemini 3.1 Pro Preview: 47.3 (#17)
- Mistral Medium 3.5: 43.2 (#101)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Longer Query | 1482 | 1414 |
| CL-bench | 20.8% | — |
| CL-bench Life | 16.9% | — |

## Writing & Preference

- Gemini 3.1 Pro Preview: 66.3 (#36)
- Mistral Medium 3.5: 58.6 (#113)

| Benchmark | Gemini 3.1 Pro Preview | Mistral Medium 3.5 |
|---|---|---|
| LMArena Text | 1480 | 1421 |
| LMArena Creative Writing | 1482 | 1372 |
| EQ-Bench 4 | 1142 | 993 |
| LMArena Multi-Turn | 1486 | 1423 |
| EQ-Bench Creative Writing | 1491 | — |

## FAQ

### Is Gemini 3.1 Pro Preview better than Mistral Medium 3.5?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 39.6 on the Noometry Index. Mistral Medium 3.5 costs 1.5× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3.1 Pro Preview or Mistral Medium 3.5?

Mistral Medium 3.5 is cheaper. It lists at $1.50 per million input tokens and $7.50 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

### Is Gemini 3.1 Pro Preview or Mistral Medium 3.5 better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.7 versus 35.7 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 262K.

### How many benchmarks do Gemini 3.1 Pro Preview and Mistral Medium 3.5 share?

21 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Mistral Medium 3.5 has 22.