# Gemini 1.5 Flash (May 2024) vs Grok 4 Fast

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 32.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 1 category and Grok 4 Fast in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 39.0.
- The biggest single-benchmark swing is DTBench: 53.8% for Gemini 1.5 Flash (May 2024) and 82.7% for Grok 4 Fast.

## Snapshot

| | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 32.9 | 39.0 |
| Rank | 240 | 164 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash (May 2024): 33.9 (#233)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| WeirdML | 24.9% | 42.9% |
| LMArena Coding | 1262 | 1429 |
| LMArena WebDev | — | 1160 |
| BigCodeBench Instruct | 43.5% | — |
| BigCodeBench Complete | 55.1% | — |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |

## Agentic & Tool Use

- Gemini 1.5 Flash (May 2024): 26.3 (#97)
- Grok 4 Fast: 29.3 (#80)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| BALROG | 14.6% | — |
| LMArena Search | — | 1171 |

## Reasoning

- Gemini 1.5 Flash (May 2024): 20.8 (#212)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1257 | 1413 |
| DTBench | 53.8% | 82.7% |
| Epoch Capabilities Index | 129.37 | 144.21 |
| ForecastBench | 53.9 | 60.5 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| PIQA | 87.5% | — |

## Math

- Gemini 1.5 Flash (May 2024): 20.8 (#274)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1269 | 1419 |
| OTIS Mock AIME 2024-2025 | 16.3% | — |
| 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 (#253)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1233 | 1411 |
| GPQA Diamond | 47.3% | — |
| MMLU-Pro | 67.8% | — |
| Vectara Hallucination Rate | — | 19.7% |
| GPQA (HELM) | 43.7% | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |

## Multimodal

- Gemini 1.5 Flash (May 2024): 35.3 (#76)
- Grok 4 Fast: —

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1141 | — |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |

## Multilingual

- Gemini 1.5 Flash (May 2024): 43.1 (#184)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1278 | 1397 |
| LMArena Chinese | 1295 | 1458 |
| LMArena French | 1257 | 1433 |
| LMArena German | 1262 | 1383 |
| LMArena Japanese | 1252 | 1358 |
| LMArena Korean | 1220 | 1359 |
| LMArena Russian | 1288 | 1387 |
| LMArena Spanish | 1242 | 1414 |

## Instruction Following

- Gemini 1.5 Flash (May 2024): 67.0 (#199)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1258 | 1388 |
| IFEval | 83.1% | — |

## Long Context

- Gemini 1.5 Flash (May 2024): 39.0 (#182)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1284 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- Gemini 1.5 Flash (May 2024): 48.9 (#190)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | Gemini 1.5 Flash (May 2024) | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1287 | 1407 |
| LMArena Creative Writing | 1285 | 1388 |
| LMArena Multi-Turn | 1253 | 1414 |
| WildBench | 79.2% | — |

## FAQ

### Is Gemini 1.5 Flash (May 2024) better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 32.9 on the Noometry Index.

### Is Gemini 1.5 Flash (May 2024) or Grok 4 Fast better for coding?

Gemini 1.5 Flash (May 2024) scores higher on coding benchmarks: 33.9 versus 32.3 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash (May 2024) and Grok 4 Fast share?

21 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and Grok 4 Fast has 30.