# Grok 4 vs Grok 4.1 Fast

> Grok 4 is the stronger model overall, scoring 47.8 to 40.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-vs-grok-4-1-fast
- Last updated: 2026-10-10
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. Grok 4 scores higher in 7 categories and Grok 4.1 Fast in 3 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4 leads 53.7 to 32.6.
- The biggest single-benchmark swing is Berkeley Function Calling Leaderboard: 63% for Grok 4 and 69.6% for Grok 4.1 Fast.

## Snapshot

| | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 47.8 | 40.9 |
| Rank | 49 | 131 |
| Context | — | 128K |
| Input $/M | — | $0.20 |
| Output $/M | — | $0.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4: 49.9 (#44)
- Grok 4.1 Fast: 33.8 (#236)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1408 | 1411 |
| Aider Polyglot | 79.6% | — |
| LMArena WebDev | — | 1241 |
| WeirdML | 45.7% | — |
| ALE-Bench | — | 394.93 |

## Agentic & Tool Use

- Grok 4: 32.1 (#62)
- Grok 4.1 Fast: 36.1 (#35)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 63% | 69.6% |
| LMArena Search | 1142 | 1171 |
| Terminal-Bench | 27.2% | — |
| GDPval | 21.1% | — |
| τ²-bench Banking | — | 13.1% |
| Cybench | 43% | — |
| DeepResearch Bench | 47.3% | — |
| BALROG | 43.6% | — |
| METR Time Horizons | 66.6% | — |
| Vending-Bench 2 | — | 1,107 |

## Reasoning

- Grok 4: 36.9 (#59)
- Grok 4.1 Fast: 42.3 (#45)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | 60.5% | 56% |
| LMArena Hard Prompts | 1409 | 1407 |
| ForecastBench | 60.9 | 61 |
| ARC-AGI-2 | 16% | — |
| Kagi LLM Benchmark | 73.6% | — |
| NYT Connections (extended) | — | 87.4% |
| ARC-AGI-1 | 66.7% | — |
| Chess Puzzles | 28% | — |
| DTBench | — | 87.7% |
| Epoch Capabilities Index | 146.46 | — |

## Math

- Grok 4: 46.5 (#58)
- Grok 4.1 Fast: 30.9 (#201)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1422 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 84% | — |
| ProofBench | — | 4% |
| Omni-MATH | 60.3% | — |
| FrontierMath (Feb 2025 set) | 19.7% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- Grok 4: 53.7 (#50)
- Grok 4.1 Fast: 32.6 (#203)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1417 | 1398 |
| GPQA Diamond | 87% | — |
| MMLU-Pro | 85.1% | — |
| Confabulations | 12.4% | — |
| Vectara Hallucination Rate | — | 17.8% |
| GPQA (HELM) | 72.7% | — |

## Multimodal

- Grok 4: 33.1 (#89)
- Grok 4.1 Fast: 36.3 (#71)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1211 | 1201 |
| GeoBench | 45% | — |

## Multilingual

- Grok 4: 52.0 (#98)
- Grok 4.1 Fast: 51.1 (#110)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1403 | 1391 |
| LMArena Chinese | 1428 | 1441 |
| LMArena French | 1418 | 1416 |
| LMArena German | 1429 | 1404 |
| LMArena Japanese | 1396 | 1347 |
| LMArena Korean | 1376 | 1361 |
| LMArena Russian | 1409 | 1387 |
| LMArena Spanish | 1419 | 1411 |

## Instruction Following

- Grok 4: 79.4 (#4)
- Grok 4.1 Fast: 72.8 (#127)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1387 | 1376 |
| IFEval | 94.9% | — |

## Long Context

- Grok 4: 63.1 (#4)
- Grok 4.1 Fast: 42.4 (#121)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1409 | 1390 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4: 58.7 (#111)
- Grok 4.1 Fast: 57.4 (#126)

| Benchmark | Grok 4 | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1412 | 1408 |
| LMArena Creative Writing | 1397 | 1394 |
| LMArena Multi-Turn | 1416 | 1389 |
| Short-Story Creative Writing | 76.9% | — |
| EQ-Bench Creative Writing | — | 1327 |
| WildBench | 79.7% | — |

## FAQ

### Is Grok 4 better than Grok 4.1 Fast?

Grok 4 is the stronger model overall, scoring 47.8 to 40.9 on the Noometry Index.

### Is Grok 4 or Grok 4.1 Fast better for coding?

Grok 4 scores higher on coding benchmarks: 49.9 versus 33.8 in the Noometry coding category.

### How many benchmarks do Grok 4 and Grok 4.1 Fast share?

22 benchmarks have published results for both models. Grok 4 has 48 scored results on Noometry and Grok 4.1 Fast has 32.