# Gemini 3 Flash Preview vs Grok 4.1 Fast

> Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 4.1× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-flash-preview-vs-grok-4-1-fast
- Last updated: 2026-10-10
- Shared benchmarks: 30

## Summary

- They share 30 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 10 categories and Grok 4.1 Fast in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3 Flash Preview leads 58.8 to 32.6.
- The biggest single-benchmark swing is τ²-bench Banking: 27.3% for Gemini 3 Flash Preview and 13.1% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.50 / $3 for Gemini 3 Flash Preview.
- Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 52.3 | 40.9 |
| Rank | 33 | 131 |
| Context | 1.05M | 128K |
| Input $/M | $0.50 | $0.20 |
| Output $/M | $3 | $0.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3 Flash Preview: 51.5 (#35)
- Grok 4.1 Fast: 33.8 (#236)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1439 | 1241 |
| LMArena Coding | 1460 | 1411 |
| ALE-Bench | 1,367 | 394.93 |
| SWE-bench Verified | 75.4% | — |
| SWE-bench Verified (bash only) | 75.8% | — |
| SWE-bench Multilingual | 72.7% | — |
| GSO | 9.8% | — |
| WeirdML | 61.6% | — |

## Agentic & Tool Use

- Gemini 3 Flash Preview: 38.6 (#27)
- Grok 4.1 Fast: 36.1 (#35)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| τ²-bench Banking | 27.3% | 13.1% |
| LMArena Search | 1198 | 1171 |
| Vending-Bench 2 | 3,635 | 1,107 |
| Terminal-Bench | 64.3% | — |
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| DeepResearch Bench | 49.8% | — |
| BALROG | 48.1% | — |
| GDP.pdf | 10% | — |

## Reasoning

- Gemini 3 Flash Preview: 49.2 (#35)
- Grok 4.1 Fast: 42.3 (#45)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | 61.1% | 56% |
| NYT Connections (extended) | 83.1% | 87.4% |
| LMArena Hard Prompts | 1465 | 1407 |
| DTBench | 89.1% | 87.7% |
| ForecastBench | 58.5 | 61 |
| ARC-AGI-2 | 33.6% | — |
| ARC-AGI-1 | 84.7% | — |
| Chess Puzzles | 40% | — |
| Mystery Game Puzzles | 26% | — |
| LMCA | 43.1% | — |
| Epoch Capabilities Index | 151.83 | — |

## Math

- Gemini 3 Flash Preview: 51.4 (#42)
- Grok 4.1 Fast: 30.9 (#201)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| MathArena Final-Answer Competitions | 67.6% | 60.9% |
| ProofBench | 15% | 4% |
| LMArena Math | 1472 | 1408 |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| FrontierMath (Feb 2025 set) | 35.6% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Gemini 3 Flash Preview: 58.8 (#30)
- Grok 4.1 Fast: 32.6 (#203)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 13.5% | 17.8% |
| LMArena Expert | 1461 | 1398 |
| GPQA Diamond | 89.4% | — |
| SimpleQA Verified | 66.8% | — |

## Multimodal

- Gemini 3 Flash Preview: 45.3 (#15)
- Grok 4.1 Fast: 36.3 (#71)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1285 | 1201 |
| GeoBench | 88% | — |
| VPCT | 72.6% | — |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1413 | — |

## Multilingual

- Gemini 3 Flash Preview: 55.9 (#26)
- Grok 4.1 Fast: 51.1 (#110)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1458 | 1391 |
| LMArena Chinese | 1510 | 1441 |
| LMArena French | 1478 | 1416 |
| LMArena German | 1497 | 1404 |
| LMArena Japanese | 1488 | 1347 |
| LMArena Korean | 1443 | 1361 |
| LMArena Russian | 1480 | 1387 |
| LMArena Spanish | 1470 | 1411 |

## Instruction Following

- Gemini 3 Flash Preview: 75.8 (#52)
- Grok 4.1 Fast: 72.8 (#127)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1437 | 1376 |

## Long Context

- Gemini 3 Flash Preview: 44.4 (#63)
- Grok 4.1 Fast: 42.4 (#121)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1452 | 1390 |

## Writing & Preference

- Gemini 3 Flash Preview: 65.6 (#44)
- Grok 4.1 Fast: 57.4 (#126)

| Benchmark | Gemini 3 Flash Preview | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1466 | 1408 |
| LMArena Creative Writing | 1457 | 1394 |
| LMArena Multi-Turn | 1471 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |

## FAQ

### Is Gemini 3 Flash Preview better than Grok 4.1 Fast?

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 4.1× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3 Flash Preview or Grok 4.1 Fast?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Gemini 3 Flash Preview lists at $0.50 and $3.

### Is Gemini 3 Flash Preview or Grok 4.1 Fast better for coding?

Gemini 3 Flash Preview scores higher on coding benchmarks: 51.5 versus 33.8 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 128K.

### How many benchmarks do Gemini 3 Flash Preview and Grok 4.1 Fast share?

30 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and Grok 4.1 Fast has 32.