# GPT-5.1 vs Grok 4

> GPT-5.1 and Grok 4 score almost the same on the Noometry Index (48.8 vs 47.8), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-1-vs-grok-4
- Last updated: 2026-10-10
- Shared benchmarks: 37

## Summary

- They share 37 benchmarks with published results for both. GPT-5.1 scores higher in 7 categories and Grok 4 in 3 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 leads 63.1 to 47.6.
- The biggest single-benchmark swing is GPQA (HELM): 44.2% for GPT-5.1 and 72.7% for Grok 4.

## Snapshot

| | GPT-5.1 | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 48.8 | 47.8 |
| Rank | 47 | 49 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1: 46.9 (#59)
- Grok 4: 49.9 (#44)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| WeirdML | 60.8% | 45.7% |
| LMArena Coding | 1454 | 1408 |
| SWE-bench Verified | 68% | — |
| SWE-bench Verified (bash only) | 66% | — |
| Aider Polyglot | — | 79.6% |
| LMArena WebDev | 1395 | — |
| SciCode | 43.3% | — |
| GSO | 13.7% | — |
| LiveBench Coding | 72.5% | — |
| ALE-Bench | 1,192 | — |

## Agentic & Tool Use

- GPT-5.1: 32.5 (#55)
- Grok 4: 32.1 (#62)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| Terminal-Bench | 47.6% | 27.2% |
| DeepResearch Bench | 42.8% | 47.3% |
| LMArena Search | 1199 | 1142 |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| BALROG | — | 43.6% |
| METR Time Horizons | — | 66.6% |
| Vending-Bench 2 | 1,473 | — |

## Reasoning

- GPT-5.1: 39.9 (#50)
- Grok 4: 36.9 (#59)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| ARC-AGI-2 | 17.6% | 16% |
| SimpleBench | 53.2% | 60.5% |
| ARC-AGI-1 | 72.8% | 66.7% |
| Chess Puzzles | 32% | 28% |
| LMArena Hard Prompts | 1457 | 1409 |
| Epoch Capabilities Index | 149.66 | 146.46 |
| ForecastBench | 58.1 | 60.9 |
| Kagi LLM Benchmark | — | 73.6% |
| CritPt | 4.9% | — |
| EnigmaEval | 11.2% | — |
| LiveBench Reasoning | 95.8% | — |
| Mystery Game Puzzles | 19% | — |
| DTBench | 90.1% | — |
| LiveBench Data Analysis | 72.1% | — |
| LMCA | 43.9% | — |
| LiveBench | 78.8% | — |

## Math

- GPT-5.1: 50.3 (#45)
- Grok 4: 46.5 (#58)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 88.6% | 84% |
| Omni-MATH | 46.4% | 60.3% |
| LMArena Math | 1446 | 1422 |
| FrontierMath (Feb 2025 set) | 31% | 19.7% |
| FrontierMath Tier 4 (v1) | 12.5% | 2.1% |
| LiveBench Math | 94.5% | — |

## Knowledge

- GPT-5.1: 50.5 (#65)
- Grok 4: 53.7 (#50)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| GPQA Diamond | 87.6% | 87% |
| MMLU-Pro | 57.9% | 85.1% |
| GPQA (HELM) | 44.2% | 72.7% |
| LMArena Expert | 1470 | 1417 |
| Humanity's Last Exam | 23.7% | — |
| SimpleQA Verified | 48% | — |
| Confabulations | — | 12.4% |
| Vectara Hallucination Rate | 10.9% | — |

## Multimodal

- GPT-5.1: 44.0 (#17)
- Grok 4: 33.1 (#89)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| LMArena Vision | 1250 | 1211 |
| GeoBench | — | 45% |
| VPCT | 58.7% | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.1: 54.0 (#51)
- Grok 4: 52.0 (#98)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| LMArena Non-English | 1431 | 1403 |
| LMArena Chinese | 1495 | 1428 |
| LMArena French | 1451 | 1418 |
| LMArena German | 1439 | 1429 |
| LMArena Japanese | 1453 | 1396 |
| LMArena Korean | 1401 | 1376 |
| LMArena Russian | 1435 | 1409 |
| LMArena Spanish | 1430 | 1419 |

## Instruction Following

- GPT-5.1: 84.0 (#1)
- Grok 4: 79.4 (#4)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| IFEval | 93.5% | 94.9% |
| LMArena Instruction Following | 1442 | 1387 |
| LiveBench Instruction Following | 93.3% | — |

## Long Context

- GPT-5.1: 47.6 (#14)
- Grok 4: 63.1 (#4)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| LMArena Longer Query | 1448 | 1409 |
| Fiction.LiveBench | — | 94.4% |
| CL-bench | 23.7% | — |
| CL-bench Life | 17.3% | — |

## Writing & Preference

- GPT-5.1: 64.7 (#53)
- Grok 4: 58.7 (#111)

| Benchmark | GPT-5.1 | Grok 4 |
|---|---|---|
| LMArena Text | 1443 | 1412 |
| LMArena Creative Writing | 1427 | 1397 |
| WildBench | 86.3% | 79.7% |
| LMArena Multi-Turn | 1449 | 1416 |
| Short-Story Creative Writing | — | 76.9% |
| LiveBench Language | 80.2% | — |

## FAQ

### Is GPT-5.1 better than Grok 4?

GPT-5.1 and Grok 4 score almost the same on the Noometry Index (48.8 vs 47.8), so choose on price, context window or the category you care about most.

### Is GPT-5.1 or Grok 4 better for coding?

Grok 4 scores higher on coding benchmarks: 49.9 versus 46.9 in the Noometry coding category.

### How many benchmarks do GPT-5.1 and Grok 4 share?

37 benchmarks have published results for both models. GPT-5.1 has 63 scored results on Noometry and Grok 4 has 48.