# Grok 4.3 vs o3-mini

> Grok 4.3 is the stronger model overall, scoring 43.8 to 36.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-3-vs-o3-mini
- Last updated: 2026-10-10
- Shared benchmarks: 30

## Summary

- They share 30 benchmarks with published results for both. Grok 4.3 scores higher in 7 categories and o3-mini in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.3 leads 35.9 to 16.3.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 42.8% for Grok 4.3 and 18.6% for o3-mini.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.10 / $4.40 for o3-mini.
- Grok 4.3 accepts more context: 1M tokens versus 200K.

## Snapshot

| | Grok 4.3 | o3-mini |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 43.8 | 36.7 |
| Rank | 86 | 212 |
| Context | 1M | 200K |
| Input $/M | $1.25 | $1.10 |
| Output $/M | $2.50 | $4.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.3: 41.6 (#121)
- o3-mini: 40.8 (#132)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| SciCode | 47.3% | 39.8% |
| WeirdML | 49.9% | 43.7% |
| LMArena Coding | 1415 | 1378 |
| Aider Polyglot | — | 60.4% |
| LMArena WebDev | 1357 | — |
| GSO | — | 1.3% |
| LiveBench Coding | — | 82.7% |
| CadEval | — | 54% |
| ALE-Bench | 944.17 | — |

## Agentic & Tool Use

- Grok 4.3: 27.7 (#99)
- o3-mini: 29.6 (#84)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| Cybench | — | 22.5% |
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |

## Reasoning

- Grok 4.3: 35.9 (#68)
- o3-mini: 16.3 (#305)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| CritPt | 8% | 0.3% |
| Chess Puzzles | 25% | 17% |
| LMArena Hard Prompts | 1396 | 1366 |
| DTBench | 90.7% | 68.8% |
| LMCA | 38.3% | 19% |
| Epoch Capabilities Index | 149.16 | 140.34 |
| ForecastBench | 60.3 | 59.6 |
| ARC-AGI-2 | — | 3% |
| SimpleBench | — | 22.8% |
| NYT Connections (extended) | 55.2% | — |
| ARC-AGI-1 | — | 34.5% |
| LiveBench Reasoning | — | 89.6% |
| Mystery Game Puzzles | — | 7% |
| LiveBench Data Analysis | — | 70.6% |
| LiveBench | — | 75.9% |

## Math

- Grok 4.3: 46.0 (#74)
- o3-mini: 28.1 (#244)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 42.8% | 18.6% |
| FrontierMath Tier 4 | 14.6% | 0% |
| OTIS Mock AIME 2024-2025 | 93.3% | 76.9% |
| LMArena Math | 1388 | 1396 |
| ProofBench | 11% | — |
| LiveBench Math | — | 77.3% |
| MATH Level 5 | — | 96.5% |
| FrontierMath (Feb 2025 set) | — | 12.4% |
| FrontierMath Tier 4 (v1) | — | 4.2% |

## Knowledge

- Grok 4.3: 52.5 (#62)
- o3-mini: 38.3 (#146)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| GPQA Diamond | 88.8% | 77% |
| SimpleQA Verified | 33.2% | 15.3% |
| LMArena Expert | 1385 | 1364 |
| Confabulations | — | 17.9% |

## Multimodal

- Grok 4.3: 31.6 (#104)
- o3-mini: —

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Vision | 1229 | — |
| Blueprint-Bench 2 | 0% | — |

## Multilingual

- Grok 4.3: 50.5 (#120)
- o3-mini: 45.7 (#164)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Non-English | 1385 | 1319 |
| LMArena Chinese | 1422 | 1379 |
| LMArena French | 1412 | 1334 |
| LMArena German | 1395 | 1303 |
| LMArena Japanese | 1379 | 1286 |
| LMArena Korean | 1356 | 1314 |
| LMArena Russian | 1399 | 1304 |
| LMArena Spanish | 1398 | 1321 |

## Instruction Following

- Grok 4.3: 72.1 (#140)
- o3-mini: 75.1 (#72)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Instruction Following | 1366 | 1337 |
| LiveBench Instruction Following | — | 84.4% |

## Long Context

- Grok 4.3: 42.5 (#123)
- o3-mini: 33.8 (#256)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Longer Query | 1393 | 1343 |
| Fiction.LiveBench | — | 50% |

## Writing & Preference

- Grok 4.3: 58.5 (#118)
- o3-mini: 50.3 (#182)

| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Text | 1397 | 1337 |
| LMArena Creative Writing | 1380 | 1286 |
| LMArena Multi-Turn | 1406 | 1320 |
| Short-Story Creative Writing | — | 61.7% |
| EQ-Bench 4 | 1075 | — |
| LiveBench Language | — | 50.7% |

## FAQ

### Is Grok 4.3 better than o3-mini?

Grok 4.3 is the stronger model overall, scoring 43.8 to 36.7 on the Noometry Index.

### Which is cheaper, Grok 4.3 or o3-mini?

Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; o3-mini lists at $1.10 and $4.40.

### Is Grok 4.3 or o3-mini better for coding?

They score almost the same on coding (41.6 vs 40.8); test both on your own repository before choosing.

### Which has the bigger context window?

Grok 4.3 does, with 1M tokens against 200K.

### How many benchmarks do Grok 4.3 and o3-mini share?

30 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and o3-mini has 51.