# GPT-4.5 vs Grok 4.3

> Grok 4.3 is the stronger model overall, scoring 43.6 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-grok-4-3
- Last updated: 2026-10-10
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. GPT-4.5 scores higher in 5 categories and Grok 4.3 in 5 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.3 leads 34.9 to 14.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 37.8% for GPT-4.5 and 93.3% for Grok 4.3.

## Snapshot

| | GPT-4.5 | Grok 4.3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 36.9 | 43.6 |
| Rank | 200 | 80 |
| Context | — | 1M |
| Input $/M | — | $1.25 |
| Output $/M | — | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4.5: 41.8 (#102)
- Grok 4.3: 41.3 (#117)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| WeirdML | 39.4% | 49.9% |
| LMArena Coding | 1397 | 1415 |
| Aider Polyglot | 44.9% | — |
| LMArena WebDev | — | 1357 |
| SciCode | — | 47.3% |
| LiveBench Coding | 75.2% | — |
| ALE-Bench | — | 944.17 |

## Agentic & Tool Use

- GPT-4.5: 27.6 (#92)
- Grok 4.3: 27.6 (#93)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| Cybench | 17.5% | — |
| GDP.pdf | — | 8% |
| LMArena Search | — | 1165 |
| Vending-Bench 2 | — | 35.26 |

## Reasoning

- GPT-4.5: 14.1 (#320)
- Grok 4.3: 34.9 (#60)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| LMArena Hard Prompts | 1404 | 1397 |
| Epoch Capabilities Index | 136.74 | 149.13 |
| ForecastBench | 61.7 | 60.3 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| NYT Connections (extended) | — | 55.2% |
| ARC-AGI-1 | 10.3% | — |
| CritPt | — | 8% |
| Chess Puzzles | — | 25% |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| DTBench | — | 90.7% |
| LiveBench Data Analysis | 64.3% | — |
| LMCA | — | 38.3% |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 31.0 (#200)
- Grok 4.3: 45.8 (#60)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | 93.3% |
| LMArena Math | 1412 | 1388 |
| FrontierMath (Tiers 1-3) | — | 42.8% |
| FrontierMath Tier 4 | — | 14.6% |
| ProofBench | — | 11% |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.4 (#205)
- Grok 4.3: 52.5 (#57)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 68.7% | 88.8% |
| LMArena Expert | 1394 | 1385 |
| Humanity's Last Exam | 5.4% | — |
| SimpleQA Verified | — | 33.2% |
| Confabulations | 13.6% | — |

## Multimodal

- GPT-4.5: 37.0 (#68)
- Grok 4.3: 31.6 (#96)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| LMArena Vision | 1195 | 1231 |
| VPCT | 45% | — |
| Blueprint-Bench 2 | — | 0% |

## Multilingual

- GPT-4.5: 52.7 (#78)
- Grok 4.3: 50.7 (#114)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| LMArena Non-English | 1413 | 1385 |
| LMArena Chinese | 1421 | 1423 |
| LMArena French | 1417 | 1412 |
| LMArena German | 1457 | 1395 |
| LMArena Japanese | 1416 | 1379 |
| LMArena Korean | 1392 | 1357 |
| LMArena Russian | 1419 | 1399 |
| LMArena Spanish | — | 1402 |

## Instruction Following

- GPT-4.5: 72.8 (#129)
- Grok 4.3: 72.3 (#135)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | 1404 | 1366 |
| LiveBench Instruction Following | 72.3% | — |

## Long Context

- GPT-4.5: 40.4 (#150)
- Grok 4.3: 42.5 (#118)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | 1406 | 1393 |
| Fiction.LiveBench | 63.9% | — |

## Writing & Preference

- GPT-4.5: 57.1 (#129)
- Grok 4.3: 58.6 (#112)

| Benchmark | GPT-4.5 | Grok 4.3 |
|---|---|---|
| LMArena Text | 1417 | 1397 |
| LMArena Creative Writing | 1394 | 1380 |
| LMArena Multi-Turn | 1444 | 1406 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench Creative Writing | 1258 | — |
| EQ-Bench 4 | — | 1075 |
| LiveBench Language | 61.5% | — |

## FAQ

### Is GPT-4.5 better than Grok 4.3?

Grok 4.3 is the stronger model overall, scoring 43.6 to 36.9 on the Noometry Index.

### Is GPT-4.5 or Grok 4.3 better for coding?

They score almost the same on coding (41.8 vs 41.3); test both on your own repository before choosing.

### How many benchmarks do GPT-4.5 and Grok 4.3 share?

22 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Grok 4.3 has 40.