# Gemini 1.5 Flash (May 2024) vs Grok 4.1 Fast

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 33.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-grok-4-1-fast
- Last updated: 2026-10-12
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 1 category and Grok 4.1 Fast in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 21.7.
- The biggest single-benchmark swing is DTBench: 53.8% for Gemini 1.5 Flash (May 2024) and 87.7% for Grok 4.1 Fast.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 33.2 | 41.4 |
| Rank | 246 | 136 |
| Context | — | 128K |
| Input $/M | — | $0.20 |
| Output $/M | — | $0.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 34.4 (#236)
- Grok 4.1 Fast: 34.1 (#245)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1261 | 1411 |
| LMArena WebDev | — | 1242 |
| WeirdML | 24.9% | — |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| ALE-Bench | — | 394.93 |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.6 (#102)
- Grok 4.1 Fast: 36.3 (#39)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| BALROG | 14.6% | — |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |

## Reasoning

- Gemini 1.5 Flash (May 2024): 21.7 (#215)
- Grok 4.1 Fast: 43.4 (#49)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1407 |
| DTBench | 53.8% | 87.7% |
| ForecastBench | 53.9 | 61 |
| SimpleBench | — | 56% |
| NYT Connections (extended) | — | 87.4% |
| Epoch Capabilities Index | 129.36 | — |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 22.1 (#281)
- Grok 4.1 Fast: 31.9 (#221)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1269 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 16.3% | — |
| ProofBench | — | 4% |
| Omni-MATH | 30.4% | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
| GSM8K | 82.4% | — |

## Knowledge

- Gemini 1.5 Flash (May 2024): 26.2 (#260)
- Grok 4.1 Fast: 33.1 (#207)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1233 | 1399 |
| GPQA Diamond | 47.3% | — |
| MMLU-Pro | 67.8% | — |
| Vectara Hallucination Rate | — | 17.8% |
| GPQA (HELM) | 43.7% | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 36.0 (#81)
- Grok 4.1 Fast: 37.0 (#76)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1141 | 1201 |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |

## Multilingual

- Gemini 1.5 Flash (May 2024): 42.9 (#189)
- Grok 4.1 Fast: 51.0 (#114)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1278 | 1391 |
| LMArena Chinese | 1295 | 1441 |
| LMArena French | 1258 | 1415 |
| LMArena German | 1262 | 1404 |
| LMArena Japanese | 1252 | 1349 |
| LMArena Korean | 1221 | 1361 |
| LMArena Russian | 1288 | 1387 |
| LMArena Spanish | 1243 | 1413 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 66.8 (#205)
- Grok 4.1 Fast: 72.7 (#133)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1258 | 1376 |
| IFEval | 83.1% | — |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#187)
- Grok 4.1 Fast: 42.4 (#126)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1284 | 1390 |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.7 (#196)
- Grok 4.1 Fast: 57.2 (#131)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1287 | 1408 |
| LMArena Creative Writing | 1285 | 1394 |
| LMArena Multi-Turn | 1253 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
| WildBench | 79.2% | — |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than Grok 4.1 Fast?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 33.2 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or Grok 4.1 Fast better for coding?

They score almost the same on coding (34.4 vs 34.1); test both on your own repository before choosing.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and Grok 4.1 Fast share?

20 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Grok 4.1 Fast has 32.