# Grok 4.20 (Non-Reasoning) vs o3-pro

> Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.6 to 42.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-20-vs-o3-pro
- Last updated: 2026-10-11
- Shared benchmarks: 7

## Summary

- They share 7 benchmarks with published results for both. Grok 4.20 (Non-Reasoning) scores higher in 3 categories and o3-pro in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 (Non-Reasoning) leads 52.3 to 23.8.
- The biggest single-benchmark swing is ARC-AGI-2: 65.1% for Grok 4.20 (Non-Reasoning) and 4.9% for o3-pro.
- Grok 4.20 (Non-Reasoning) is cheaper at $1.25 / $2.50 per million input/output tokens, against $20 / $80 for o3-pro.
- Grok 4.20 (Non-Reasoning) accepts more context: 1M tokens versus 200K.

## Snapshot

| | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 48.6 | 42.9 |
| Rank | 54 | 105 |
| Context | 1M | 200K |
| Input $/M | $1.25 | $20 |
| Output $/M | $2.50 | $80 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 (Non-Reasoning): 42.1 (#112)
- o3-pro: 55.5 (#24)

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| WeirdML | 52.3% | 58.2% |
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1375 | — |
| LMArena Coding | 1459 | — |
| ALE-Bench | 1,150 | — |

## Agentic & Tool Use

- Grok 4.20 (Non-Reasoning): 34.4 (#46)
- o3-pro: —

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| Terminal-Bench | 57.3% | — |
| τ²-bench Banking | 18% | — |
| LMArena Search | 1189 | — |
| Vending-Bench 2 | 4,663 | — |

## Reasoning

- Grok 4.20 (Non-Reasoning): 52.3 (#32)
- o3-pro: 23.8 (#171)

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| ARC-AGI-2 | 65.1% | 4.9% |
| Kagi LLM Benchmark | 75% | 72.1% |
| ARC-AGI-1 | 89.5% | 59.3% |
| DTBench | 90.1% | 86.9% |
| LMCA | 38.7% | 38.5% |
| Epoch Capabilities Index | 151.98 | 147.42 |
| NYT Connections (extended) | 85.4% | — |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 63.8% | — |
| LMArena Hard Prompts | 1451 | — |
| ForecastBench | 61.4 | — |

## Math

- Grok 4.20 (Non-Reasoning): 48.2 (#65)
- o3-pro: —

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 44.9% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| ProofBench | 14% | — |
| LMArena Math | 1455 | — |

## Knowledge

- Grok 4.20 (Non-Reasoning): 52.8 (#60)
- o3-pro: 29.5 (#238)

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| GPQA Diamond | 89.3% | — |
| SimpleQA Verified | 30.2% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1439 | — |

## Multimodal

- Grok 4.20 (Non-Reasoning): 33.3 (#98)
- o3-pro: —

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| LMArena Vision | 1263 | — |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1416 | — |

## Multilingual

- Grok 4.20 (Non-Reasoning): 54.5 (#40)
- o3-pro: —

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| LMArena Non-English | 1441 | — |
| LMArena Chinese | 1481 | — |
| LMArena French | 1476 | — |
| LMArena German | 1465 | — |
| LMArena Japanese | 1449 | — |
| LMArena Korean | 1417 | — |
| LMArena Russian | 1458 | — |
| LMArena Spanish | 1443 | — |

## Instruction Following

- Grok 4.20 (Non-Reasoning): 74.8 (#83)
- o3-pro: —

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1420 | — |

## Long Context

- Grok 4.20 (Non-Reasoning): 45.5 (#34)
- o3-pro: 72.2 (#1)

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| CL-bench | 22.2% | — |
| CL-bench Life | 11.9% | — |
| LMArena Longer Query | 1437 | — |

## Writing & Preference

- Grok 4.20 (Non-Reasoning): 65.7 (#44)
- o3-pro: 57.1 (#133)

| Benchmark | Grok 4.20 (Non-Reasoning) | o3-pro |
|---|---|---|
| LMArena Text | 1451 | — |
| LMArena Creative Writing | 1438 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1574 | — |
| LMArena Multi-Turn | 1456 | — |

## FAQ

### Is Grok 4.20 (Non-Reasoning) better than o3-pro?

Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.6 to 42.9 on the Noometry Index.

### Which is cheaper, Grok 4.20 (Non-Reasoning) or o3-pro?

Grok 4.20 (Non-Reasoning) is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; o3-pro lists at $20 and $80.

### Is Grok 4.20 (Non-Reasoning) or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.5 versus 42.1 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.20 (Non-Reasoning) does, with 1M tokens against 200K.

### How many benchmarks do Grok 4.20 (Non-Reasoning) and o3-pro share?

7 benchmarks have published results for both models. Grok 4.20 (Non-Reasoning) has 46 scored results on Noometry and o3-pro has 12.