# Gemini 2.5 Pro vs Grok 4.1 Fast

> Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 12× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-2-5-pro-vs-grok-4-1-fast
- Last updated: 2026-10-12
- Shared benchmarks: 28

## Summary

- They share 28 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 8 categories and Grok 4.1 Fast in 2 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 2.5 Pro leads 56.0 to 33.1.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 7% for Gemini 2.5 Pro and 17.8% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $1.25 / $10 for Gemini 2.5 Pro.
- Gemini 2.5 Pro accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 45.0 | 41.4 |
| Rank | 75 | 136 |
| Context | 1.05M | 128K |
| Input $/M | $1.25 | $0.20 |
| Output $/M | $10 | $0.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.5 Pro: 42.4 (#101)
- Grok 4.1 Fast: 34.1 (#245)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1227 | 1242 |
| LMArena Coding | 1452 | 1411 |
| ALE-Bench | 785.52 | 394.93 |
| SWE-bench Verified | 57.6% | — |
| SWE-bench Verified (bash only) | 53.6% | — |
| Aider Polyglot | 83.1% | — |
| SciCode | 42.8% | — |
| GSO | 3.9% | — |
| WeirdML | 54% | — |
| LiveBench Coding | 85.9% | — |
| CadEval | 64% | — |
| AlgoTune | 1.51 | — |

## Agentic & Tool Use

- Gemini 2.5 Pro: 29.2 (#88)
- Grok 4.1 Fast: 36.3 (#39)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| τ²-bench Banking | 13.7% | 13.1% |
| LMArena Search | 1142 | 1171 |
| Vending-Bench 2 | 573.64 | 1,107 |
| Terminal-Bench | 32.6% | — |
| Berkeley Function Calling Leaderboard | — | 69.6% |
| GDPval | 23.3% | — |
| Remote Labor Index | 0.8% | — |
| TheAgentCompany | 30.3% | — |
| DeepResearch Bench | 42.8% | — |
| BALROG | 43.3% | — |
| METR Time Horizons | 55.4% | — |

## Reasoning

- Gemini 2.5 Pro: 28.8 (#99)
- Grok 4.1 Fast: 43.4 (#49)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | 62.4% | 56% |
| LMArena Hard Prompts | 1455 | 1407 |
| DTBench | 82.4% | 87.7% |
| ForecastBench | 61.3 | 61 |
| ARC-AGI-2 | 4.9% | — |
| Kagi LLM Benchmark | 70.3% | — |
| NYT Connections (extended) | — | 87.4% |
| ARC-AGI-1 | 41% | — |
| CritPt | 2% | — |
| Chess Puzzles | 20% | — |
| EnigmaEval | 5.6% | — |
| LiveBench Reasoning | 89.8% | — |
| LiveBench Data Analysis | 79.9% | — |
| LMCA | 34.8% | — |
| Epoch Capabilities Index | 145.32 | — |
| LiveBench | 82.3% | — |

## Math

- Gemini 2.5 Pro: 32.5 (#213)
- Grok 4.1 Fast: 31.9 (#221)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1450 | 1408 |
| FrontierMath (Tiers 1-3) | 24.6% | — |
| FrontierMath Tier 4 | 0% | — |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 84.7% | — |
| ProofBench | — | 4% |
| Omni-MATH | 41.6% | — |
| LiveBench Math | 90.2% | — |
| MATH Level 5 | 95.9% | — |
| FrontierMath (Feb 2025 set) | 14.1% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Gemini 2.5 Pro: 56.0 (#46)
- Grok 4.1 Fast: 33.1 (#207)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 7% | 17.8% |
| LMArena Expert | 1452 | 1399 |
| GPQA Diamond | 85.3% | — |
| Humanity's Last Exam | 21.6% | — |
| MMLU-Pro | 86.3% | — |
| Confabulations | 10.6% | — |
| GPQA (HELM) | 74.9% | — |

## Multimodal

- Gemini 2.5 Pro: 45.2 (#18)
- Grok 4.1 Fast: 37.0 (#76)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1263 | 1201 |
| GeoBench | 86% | — |
| VPCT | 48% | — |
| LMArena Document | 1421 | — |
| SpatialViz-Bench | 44.7% | — |

## Multilingual

- Gemini 2.5 Pro: 55.3 (#31)
- Grok 4.1 Fast: 51.0 (#114)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1451 | 1391 |
| LMArena Chinese | 1507 | 1441 |
| LMArena French | 1472 | 1415 |
| LMArena German | 1487 | 1404 |
| LMArena Japanese | 1461 | 1349 |
| LMArena Korean | 1434 | 1361 |
| LMArena Russian | 1461 | 1387 |
| LMArena Spanish | 1473 | 1413 |

## Instruction Following

- Gemini 2.5 Pro: 75.0 (#75)
- Grok 4.1 Fast: 72.7 (#133)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1437 | 1376 |
| LiveBench Instruction Following | 80.6% | — |
| IFEval | 84% | — |

## Long Context

- Gemini 2.5 Pro: 59.8 (#5)
- Grok 4.1 Fast: 42.4 (#126)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1449 | 1390 |
| Fiction.LiveBench | 91.7% | — |

## Writing & Preference

- Gemini 2.5 Pro: 63.7 (#62)
- Grok 4.1 Fast: 57.2 (#131)

| Benchmark | Gemini 2.5 Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1458 | 1408 |
| LMArena Creative Writing | 1454 | 1394 |
| EQ-Bench Creative Writing | 1421 | 1327 |
| LMArena Multi-Turn | 1453 | 1389 |
| Short-Story Creative Writing | 83.8% | — |
| WildBench | 85.7% | — |
| LiveBench Language | 67.8% | — |

## FAQ

### Is Gemini 2.5 Pro better than Grok 4.1 Fast?

Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 12× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, Gemini 2.5 Pro 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 2.5 Pro lists at $1.25 and $10.

### Is Gemini 2.5 Pro or Grok 4.1 Fast better for coding?

Gemini 2.5 Pro scores higher on coding benchmarks: 42.4 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

Gemini 2.5 Pro does, with 1.05M tokens against 128K.

### How many benchmarks do Gemini 2.5 Pro and Grok 4.1 Fast share?

28 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and Grok 4.1 Fast has 32.