# GPT-5.5 Pro vs Grok 4

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 48.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-grok-4
- Last updated: 2026-10-10
- Shared benchmarks: 9

## Summary

- They share 9 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Grok 4 in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 36.7.
- The biggest single-benchmark swing is ARC-AGI-2: 84.6% for GPT-5.5 Pro and 16% for Grok 4.

## Snapshot

| | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 64.3 | 48.1 |
| Rank | 8 | 56 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Pro: —
- Grok 4: 50.3 (#46)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| Aider Polyglot | — | 79.6% |
| WeirdML | — | 45.7% |
| LMArena Coding | — | 1408 |

## Agentic & Tool Use

- GPT-5.5 Pro: —
- Grok 4: 32.3 (#68)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| Terminal-Bench | — | 27.2% |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| BALROG | — | 43.6% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |

## Reasoning

- GPT-5.5 Pro: 73.3 (#10)
- Grok 4: 36.7 (#65)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| ARC-AGI-2 | 84.6% | 16% |
| SimpleBench | 76.9% | 60.5% |
| ARC-AGI-1 | 96.5% | 66.7% |
| Chess Puzzles | 64% | 28% |
| Epoch Capabilities Index | 162.07 | 146.44 |
| Kagi LLM Benchmark | — | 73.6% |
| CritPt | 30.6% | — |
| LMArena Hard Prompts | — | 1409 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| ForecastBench | — | 60.9 |

## Math

- GPT-5.5 Pro: 84.0 (#10)
- Grok 4: 48.4 (#64)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 84% |
| FrontierMath (Feb 2025 set) | 52.4% | 19.7% |
| FrontierMath Tier 4 (v1) | 39.6% | 2.1% |
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| Omni-MATH | — | 60.3% |
| LMArena Math | — | 1422 |

## Knowledge

- GPT-5.5 Pro: 64.1 (#19)
- Grok 4: 53.8 (#55)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| GPQA Diamond | 93.9% | 87% |
| MMLU-Pro | — | 85.1% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 72.7% |
| LMArena Expert | — | 1415 |

## Multimodal

- GPT-5.5 Pro: —
- Grok 4: 33.7 (#94)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| LMArena Vision | — | 1210 |
| GeoBench | — | 45% |

## Multilingual

- GPT-5.5 Pro: —
- Grok 4: 51.8 (#103)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| LMArena Non-English | — | 1403 |
| LMArena Chinese | — | 1427 |
| LMArena French | — | 1418 |
| LMArena German | — | 1429 |
| LMArena Japanese | — | 1394 |
| LMArena Korean | — | 1377 |
| LMArena Russian | — | 1410 |
| LMArena Spanish | — | 1420 |

## Instruction Following

- GPT-5.5 Pro: —
- Grok 4: 79.2 (#5)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| IFEval | — | 94.9% |
| LMArena Instruction Following | — | 1387 |

## Long Context

- GPT-5.5 Pro: —
- Grok 4: 63.1 (#4)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1409 |

## Writing & Preference

- GPT-5.5 Pro: —
- Grok 4: 58.5 (#116)

| Benchmark | GPT-5.5 Pro | Grok 4 |
|---|---|---|
| LMArena Text | — | 1411 |
| LMArena Creative Writing | — | 1397 |
| Short-Story Creative Writing | — | 76.9% |
| WildBench | — | 79.7% |
| LMArena Multi-Turn | — | 1416 |

## FAQ

### Is GPT-5.5 Pro better than Grok 4?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 48.1 on the Noometry Index.

### How many benchmarks do GPT-5.5 Pro and Grok 4 share?

9 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Grok 4 has 48.