# Gemini 2.5 Flash-Lite vs Grok 4 Fast

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 36.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-2-5-flash-lite-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 2 categories and Grok 4 Fast in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 33.3.
- The biggest single-benchmark swing is Fiction.LiveBench: 47.2% for Gemini 2.5 Flash-Lite and 94.4% for Grok 4 Fast.

## Snapshot

| | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 36.4 | 39.0 |
| Rank | 208 | 164 |
| Context | 1.05M | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.40 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.5 Flash-Lite: 38.0 (#167)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| WeirdML | 35.2% | 42.9% |
| LMArena Coding | 1373 | 1429 |
| LMArena WebDev | — | 1160 |
| ALE-Bench | 325.9 | — |

## Agentic & Tool Use

- Gemini 2.5 Flash-Lite: 27.8 (#89)
- Grok 4 Fast: 29.3 (#80)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 36.9% | — |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- Gemini 2.5 Flash-Lite: 21.5 (#196)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| Kagi LLM Benchmark | 40.5% | 66.1% |
| LMArena Hard Prompts | 1377 | 1413 |
| DTBench | 62.8% | 82.7% |
| Epoch Capabilities Index | 133.93 | 144.21 |
| ARC-AGI-2 | — | 5.3% |
| ARC-AGI-1 | — | 48.5% |
| LMCA | 18.1% | — |
| ForecastBench | — | 60.5 |

## Math

- Gemini 2.5 Flash-Lite: 35.5 (#144)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1373 | 1419 |
| Omni-MATH | 48% | — |

## Knowledge

- Gemini 2.5 Flash-Lite: 32.1 (#206)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 3.3% | 19.7% |
| LMArena Expert | 1373 | 1411 |
| MMLU-Pro | 53.7% | — |
| GPQA (HELM) | 30.9% | — |

## Multimodal

- Gemini 2.5 Flash-Lite: 28.6 (#109)
- Grok 4 Fast: —

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1198 | — |
| VPCT | 30% | — |

## Multilingual

- Gemini 2.5 Flash-Lite: 49.5 (#129)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1369 | 1397 |
| LMArena Chinese | 1404 | 1458 |
| LMArena French | 1388 | 1433 |
| LMArena German | 1390 | 1383 |
| LMArena Japanese | 1359 | 1358 |
| LMArena Korean | 1358 | 1359 |
| LMArena Russian | 1373 | 1387 |
| LMArena Spanish | 1396 | 1414 |

## Instruction Following

- Gemini 2.5 Flash-Lite: 70.2 (#163)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1366 | 1388 |
| IFEval | 81% | — |

## Long Context

- Gemini 2.5 Flash-Lite: 33.3 (#257)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | 47.2% | 94.4% |
| LMArena Longer Query | 1373 | 1415 |

## Writing & Preference

- Gemini 2.5 Flash-Lite: 57.0 (#130)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | Gemini 2.5 Flash-Lite | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1379 | 1407 |
| LMArena Creative Writing | 1366 | 1388 |
| LMArena Multi-Turn | 1367 | 1414 |
| WildBench | 81.8% | — |

## FAQ

### Is Gemini 2.5 Flash-Lite better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 36.4 on the Noometry Index.

### Is Gemini 2.5 Flash-Lite or Grok 4 Fast better for coding?

Gemini 2.5 Flash-Lite scores higher on coding benchmarks: 38.0 versus 32.3 in the Noometry coding category.

### How many benchmarks do Gemini 2.5 Flash-Lite and Grok 4 Fast share?

23 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and Grok 4 Fast has 30.