# Gemini 3.1 Pro Preview vs Grok 4.3

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.6 on the Noometry Index. Grok 4.3 costs 2.9× 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-grok-4-3
- Last updated: 2026-10-10
- Shared benchmarks: 40

## Summary

- They share 40 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 10 categories and Grok 4.3 in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 34.9.
- The biggest single-benchmark swing is NYT Connections (extended): 97.4% for Gemini 3.1 Pro Preview and 55.2% for Grok 4.3.
- Grok 4.3 is cheaper at $1.25 / $2.50 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 1M.

## Snapshot

| | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 56.7 | 43.6 |
| Rank | 20 | 80 |
| Context | 1.05M | 1M |
| Input $/M | $2 | $1.25 |
| Output $/M | $12 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.1 Pro Preview: 42.7 (#88)
- Grok 4.3: 41.3 (#117)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| LMArena WebDev | 1446 | 1357 |
| SciCode | 58.9% | 47.3% |
| WeirdML | 72.1% | 49.9% |
| LMArena Coding | 1483 | 1415 |
| ALE-Bench | 1,161 | 944.17 |
| SWE-bench Verified | 75.6% | — |
| DeepSWE | 11.7% | — |
| GSO | 22.6% | — |
| MirrorCode | 8.9% | — |
| AlgoTune | 2.02 | — |

## Agentic & Tool Use

- Gemini 3.1 Pro Preview: 37.7 (#33)
- Grok 4.3: 27.6 (#93)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| GDP.pdf | 17% | 8% |
| LMArena Search | 1211 | 1165 |
| Vending-Bench 2 | 3,774 | 35.26 |
| 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% | — |
| METR Time Horizons | 77% | — |

## Reasoning

- Gemini 3.1 Pro Preview: 71.7 (#9)
- Grok 4.3: 34.9 (#60)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| NYT Connections (extended) | 97.4% | 55.2% |
| CritPt | 17.7% | 8% |
| Chess Puzzles | 55% | 25% |
| LMArena Hard Prompts | 1484 | 1397 |
| DTBench | 97.1% | 90.7% |
| LMCA | 53.8% | 38.3% |
| Epoch Capabilities Index | 154.92 | 149.13 |
| ForecastBench | 59 | 60.3 |
| ARC-AGI-2 | 77.1% | — |
| SimpleBench | 79.6% | — |
| ARC-AGI-1 | 98% | — |
| EnigmaEval | 36.8% | — |
| Thematic Generalization | 79.4% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 34% | — |

## Math

- Gemini 3.1 Pro Preview: 61.8 (#28)
- Grok 4.3: 45.8 (#60)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 59.6% | 42.8% |
| FrontierMath Tier 4 | 26.8% | 14.6% |
| OTIS Mock AIME 2024-2025 | 95.6% | 93.3% |
| ProofBench | 26% | 11% |
| LMArena Math | 1485 | 1388 |
| MathArena Final-Answer Competitions | 86.5% | — |
| FrontierMath (Feb 2025 set) | 36.9% | — |
| FrontierMath Tier 4 (v1) | 16.7% | — |

## Knowledge

- Gemini 3.1 Pro Preview: 71.8 (#3)
- Grok 4.3: 52.5 (#57)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 94.4% | 88.8% |
| SimpleQA Verified | 73.5% | 33.2% |
| LMArena Expert | 1484 | 1385 |
| Humanity's Last Exam | 46.4% | — |
| Vectara Hallucination Rate | 10.4% | — |

## Multimodal

- Gemini 3.1 Pro Preview: 38.1 (#60)
- Grok 4.3: 31.6 (#96)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| LMArena Vision | 1296 | 1231 |
| Blueprint-Bench 2 | 26.5% | 0% |
| Furniture Assembly | 26.7% | — |
| LMArena Document | 1444 | — |

## Multilingual

- Gemini 3.1 Pro Preview: 57.1 (#11)
- Grok 4.3: 50.7 (#114)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| LMArena Non-English | 1475 | 1385 |
| LMArena Chinese | 1528 | 1423 |
| LMArena French | 1488 | 1412 |
| LMArena German | 1491 | 1395 |
| LMArena Japanese | 1494 | 1379 |
| LMArena Korean | 1458 | 1357 |
| LMArena Russian | 1496 | 1399 |
| LMArena Spanish | 1480 | 1402 |

## Instruction Following

- Gemini 3.1 Pro Preview: 77.1 (#31)
- Grok 4.3: 72.3 (#135)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | 1465 | 1366 |

## Long Context

- Gemini 3.1 Pro Preview: 47.3 (#17)
- Grok 4.3: 42.5 (#118)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | 1482 | 1393 |
| CL-bench | 20.8% | — |
| CL-bench Life | 16.9% | — |

## Writing & Preference

- Gemini 3.1 Pro Preview: 66.3 (#36)
- Grok 4.3: 58.6 (#112)

| Benchmark | Gemini 3.1 Pro Preview | Grok 4.3 |
|---|---|---|
| LMArena Text | 1480 | 1397 |
| LMArena Creative Writing | 1482 | 1380 |
| EQ-Bench 4 | 1142 | 1075 |
| LMArena Multi-Turn | 1486 | 1406 |
| EQ-Bench Creative Writing | 1491 | — |

## FAQ

### Is Gemini 3.1 Pro Preview better than Grok 4.3?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.6 on the Noometry Index. Grok 4.3 costs 2.9× 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 Grok 4.3?

Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

### Is Gemini 3.1 Pro Preview or Grok 4.3 better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.7 versus 41.3 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 1M.

### How many benchmarks do Gemini 3.1 Pro Preview and Grok 4.3 share?

40 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Grok 4.3 has 40.