# GPT-5 Nano vs Grok 3

> Grok 3 is the stronger model overall, scoring 39.6 to 33.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-nano-vs-grok-3
- Last updated: 2026-10-10
- Shared benchmarks: 33

## Summary

- They share 33 benchmarks with published results for both. GPT-5 Nano scores higher in 1 category and Grok 3 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 3 leads 56.0 to 39.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 81.1% for GPT-5 Nano and 55.6% for Grok 3.

## Snapshot

| | GPT-5 Nano | Grok 3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 33.4 | 39.6 |
| Rank | 234 | 150 |
| Context | 400K | — |
| Input $/M | $0.05 | — |
| Output $/M | $0.40 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5 Nano: 33.3 (#248)
- Grok 3: 41.5 (#113)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| WeirdML | 38.1% | 37.2% |
| LMArena Coding | 1351 | 1432 |
| SWE-bench Verified (bash only) | 34.8% | — |
| Aider Polyglot | — | 53.3% |
| ALE-Bench | 718.67 | — |

## Agentic & Tool Use

- GPT-5 Nano: 25.6 (#99)
- Grok 3: 30.2 (#69)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| Terminal-Bench | 21.8% | — |
| Berkeley Function Calling Leaderboard | 51.5% | — |
| BALROG | — | 29.5% |

## Reasoning

- GPT-5 Nano: 16.4 (#291)
- Grok 3: 13.8 (#322)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| ARC-AGI-2 | 2.6% | 0% |
| Kagi LLM Benchmark | 62.2% | 61.3% |
| ARC-AGI-1 | 20.7% | 5.5% |
| LMArena Hard Prompts | 1329 | 1433 |
| Epoch Capabilities Index | 139.39 | 138.34 |
| SimpleBench | — | 36.1% |
| Chess Puzzles | 27% | — |
| Mystery Game Puzzles | 9% | — |
| DTBench | 62.7% | — |
| LMCA | 7.9% | — |
| ForecastBench | 59.1 | — |

## Math

- GPT-5 Nano: 29.1 (#221)
- Grok 3: 36.2 (#122)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 81.1% | 55.6% |
| Omni-MATH | 54.6% | 46.4% |
| LMArena Math | 1318 | 1390 |
| MATH Level 5 | 95.2% | 88.7% |
| FrontierMath (Feb 2025 set) | 8.3% | 3.8% |
| FrontierMath Tier 4 (v1) | 2.1% | 0% |
| FrontierMath (Tiers 1-3) | 20% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | 12% | — |

## Knowledge

- GPT-5 Nano: 35.8 (#166)
- Grok 3: 46.0 (#76)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| GPQA Diamond | 69.4% | 75.8% |
| MMLU-Pro | 77.8% | 78.8% |
| Vectara Hallucination Rate | 10.5% | 5.8% |
| GPQA (HELM) | 67.9% | 65% |
| LMArena Expert | 1321 | 1420 |
| SimpleQA Verified | 11.7% | — |
| Confabulations | — | 14.2% |

## Multimodal

- GPT-5 Nano: 30.7 (#102)
- Grok 3: —

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| LMArena Vision | 1159 | — |
| VPCT | 37.2% | — |

## Multilingual

- GPT-5 Nano: 45.5 (#167)
- Grok 3: 52.5 (#81)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| LMArena Non-English | 1313 | 1411 |
| LMArena Chinese | 1355 | 1448 |
| LMArena German | 1329 | 1431 |
| LMArena Korean | 1269 | 1374 |
| LMArena Russian | 1296 | 1416 |
| LMArena Spanish | 1360 | 1417 |
| LMArena French | — | 1460 |
| LMArena Japanese | — | 1389 |

## Instruction Following

- GPT-5 Nano: 75.2 (#72)
- Grok 3: 75.2 (#69)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| IFEval | 93.2% | 88.4% |
| LMArena Instruction Following | 1306 | 1409 |

## Long Context

- GPT-5 Nano: 31.3 (#275)
- Grok 3: 38.7 (#187)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| Fiction.LiveBench | 44.4% | 58.3% |
| LMArena Longer Query | 1313 | 1439 |

## Writing & Preference

- GPT-5 Nano: 39.4 (#244)
- Grok 3: 56.0 (#136)

| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| LMArena Text | 1320 | 1426 |
| LMArena Creative Writing | 1250 | 1414 |
| EQ-Bench Creative Writing | 705 | 1186 |
| WildBench | 80.6% | 84.9% |
| LMArena Multi-Turn | 1311 | 1424 |
| Short-Story Creative Writing | — | 76.4% |

## FAQ

### Is GPT-5 Nano better than Grok 3?

Grok 3 is the stronger model overall, scoring 39.6 to 33.4 on the Noometry Index.

### Is GPT-5 Nano or Grok 3 better for coding?

Grok 3 scores higher on coding benchmarks: 41.5 versus 33.3 in the Noometry coding category.

### How many benchmarks do GPT-5 Nano and Grok 3 share?

33 benchmarks have published results for both models. GPT-5 Nano has 48 scored results on Noometry and Grok 3 has 40.