# GPT-5 Nano vs Grok 4

> Grok 4 is the stronger model overall, scoring 48.1 to 33.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-nano-vs-grok-4
- Last updated: 2026-10-10
- Shared benchmarks: 36

## Summary

- They share 36 benchmarks with published results for both. GPT-5 Nano scores higher in 0 categories and Grok 4 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 leads 63.1 to 31.3.
- The biggest single-benchmark swing is Fiction.LiveBench: 44.4% for GPT-5 Nano and 94.4% for Grok 4.

## Snapshot

| | GPT-5 Nano | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 33.5 | 48.1 |
| Rank | 241 | 56 |
| Context | 400K | — |
| Input $/M | $0.05 | — |
| Output $/M | $0.40 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5 Nano: 33.6 (#254)
- Grok 4: 50.3 (#46)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| WeirdML | 38.1% | 45.7% |
| LMArena Coding | 1351 | 1408 |
| SWE-bench Verified (bash only) | 34.8% | — |
| Aider Polyglot | — | 79.6% |
| ALE-Bench | 718.67 | — |

## Agentic & Tool Use

- GPT-5 Nano: 25.8 (#106)
- Grok 4: 32.3 (#68)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| Terminal-Bench | 21.8% | 27.2% |
| Berkeley Function Calling Leaderboard | 51.5% | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| BALROG | — | 43.6% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |

## Reasoning

- GPT-5 Nano: 16.3 (#306)
- Grok 4: 36.7 (#65)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| ARC-AGI-2 | 2.6% | 16% |
| Kagi LLM Benchmark | 62.2% | 73.6% |
| ARC-AGI-1 | 20.7% | 66.7% |
| Chess Puzzles | 27% | 28% |
| LMArena Hard Prompts | 1328 | 1409 |
| Epoch Capabilities Index | 139.38 | 146.44 |
| ForecastBench | 59.1 | 60.9 |
| SimpleBench | — | 60.5% |
| Mystery Game Puzzles | 9% | — |
| DTBench | 62.7% | — |
| LMCA | 7.9% | — |

## Math

- GPT-5 Nano: 29.4 (#241)
- Grok 4: 48.4 (#64)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 81.1% | 84% |
| Omni-MATH | 54.6% | 60.3% |
| LMArena Math | 1317 | 1422 |
| FrontierMath (Feb 2025 set) | 8.3% | 19.7% |
| FrontierMath Tier 4 (v1) | 2.1% | 2.1% |
| FrontierMath (Tiers 1-3) | 20% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | 12% | — |
| MATH Level 5 | 95.2% | — |

## Knowledge

- GPT-5 Nano: 35.9 (#178)
- Grok 4: 53.8 (#55)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| GPQA Diamond | 69.4% | 87% |
| MMLU-Pro | 77.8% | 85.1% |
| GPQA (HELM) | 67.9% | 72.7% |
| LMArena Expert | 1321 | 1415 |
| SimpleQA Verified | 11.7% | — |
| Confabulations | — | 12.4% |
| Vectara Hallucination Rate | 10.5% | — |

## Multimodal

- GPT-5 Nano: 31.3 (#108)
- Grok 4: 33.7 (#94)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| LMArena Vision | 1159 | 1210 |
| GeoBench | — | 45% |
| VPCT | 37.2% | — |

## Multilingual

- GPT-5 Nano: 45.3 (#172)
- Grok 4: 51.8 (#103)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| LMArena Non-English | 1313 | 1403 |
| LMArena Chinese | 1356 | 1427 |
| LMArena German | 1327 | 1429 |
| LMArena Japanese | 1226 | 1394 |
| LMArena Korean | 1269 | 1377 |
| LMArena Russian | 1296 | 1410 |
| LMArena Spanish | 1360 | 1420 |
| LMArena French | — | 1418 |

## Instruction Following

- GPT-5 Nano: 75.0 (#79)
- Grok 4: 79.2 (#5)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| IFEval | 93.2% | 94.9% |
| LMArena Instruction Following | 1306 | 1387 |

## Long Context

- GPT-5 Nano: 31.3 (#281)
- Grok 4: 63.1 (#4)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| Fiction.LiveBench | 44.4% | 94.4% |
| LMArena Longer Query | 1312 | 1409 |

## Writing & Preference

- GPT-5 Nano: 39.1 (#249)
- Grok 4: 58.5 (#116)

| Benchmark | GPT-5 Nano | Grok 4 |
|---|---|---|
| LMArena Text | 1320 | 1411 |
| LMArena Creative Writing | 1249 | 1397 |
| WildBench | 80.6% | 79.7% |
| LMArena Multi-Turn | 1311 | 1416 |
| Short-Story Creative Writing | — | 76.9% |
| EQ-Bench Creative Writing | 705 | — |

## FAQ

### Is GPT-5 Nano better than Grok 4?

Grok 4 is the stronger model overall, scoring 48.1 to 33.5 on the Noometry Index.

### Is GPT-5 Nano or Grok 4 better for coding?

Grok 4 scores higher on coding benchmarks: 50.3 versus 33.6 in the Noometry coding category.

### How many benchmarks do GPT-5 Nano and Grok 4 share?

36 benchmarks have published results for both models. GPT-5 Nano has 49 scored results on Noometry and Grok 4 has 48.