# GPT-6 Sol vs Grok 4.20 (Non-Reasoning)

> GPT-6 Sol and Grok 4.20 (Non-Reasoning) score almost the same on the Noometry Index (49.2 vs 48.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-6-sol-vs-grok-4-20
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. GPT-6 Sol scores higher in 3 categories and Grok 4.20 (Non-Reasoning) in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-6 Sol leads 59.6 to 41.8.
- Grok 4.20 (Non-Reasoning) is cheaper at $1.25 / $2.50 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
- GPT-6 Sol accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 49.2 | 48.5 |
| Rank | 46 | 48 |
| Context | 1.05M | 1M |
| Input $/M | $2 | $1.25 |
| Output $/M | $10 | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-6 Sol: 59.6 (#11)
- Grok 4.20 (Non-Reasoning): 41.8 (#104)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena WebDev | 1692 | 1374 |
| LMArena Coding | 1453 | 1458 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| WeirdML | — | 52.3% |
| ALE-Bench | — | 1,150 |

## Agentic & Tool Use

- GPT-6 Sol: 33.5 (#49)
- Grok 4.20 (Non-Reasoning): 34.3 (#43)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Terminal-Bench | — | 57.3% |
| τ²-bench Banking | — | 18% |
| GDP.pdf | 28% | — |
| LMArena Search | — | 1189 |
| Vending-Bench 2 | — | 4,663 |

## Reasoning

- GPT-6 Sol: 49.3 (#34)
- Grok 4.20 (Non-Reasoning): 52.2 (#30)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| NYT Connections (extended) | 90.1% | 85.4% |
| LMArena Hard Prompts | 1420 | 1451 |
| ARC-AGI-2 | — | 65.1% |
| Kagi LLM Benchmark | — | 75% |
| ARC-AGI-1 | — | 89.5% |
| Chess Puzzles | — | 24% |
| Thematic Generalization | — | 63.8% |
| EBR-Bench | 53.3% | — |
| DTBench | — | 90.1% |
| LMCA | — | 38.7% |
| Epoch Capabilities Index | — | 152.01 |
| ForecastBench | — | 61.4 |

## Math

- GPT-6 Sol: 35.8 (#135)
- Grok 4.20 (Non-Reasoning): 48.0 (#54)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Math | 1404 | 1455 |
| FrontierMath (Tiers 1-3) | — | 44.9% |
| FrontierMath Tier 4 | — | 17.1% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| ProofBench | — | 14% |

## Knowledge

- GPT-6 Sol: 43.0 (#87)
- Grok 4.20 (Non-Reasoning): 52.8 (#54)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Expert | 1449 | 1440 |
| GPQA Diamond | — | 89.3% |
| SimpleQA Verified | — | 30.2% |
| Vectara Hallucination Rate | 6.5% | — |

## Multimodal

- GPT-6 Sol: 47.6 (#9)
- Grok 4.20 (Non-Reasoning): 33.2 (#88)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Vision | — | 1263 |
| Blueprint-Bench 2 | — | 0% |
| Furniture Assembly | 58.3% | — |
| LMArena Document | — | 1416 |

## Multilingual

- GPT-6 Sol: 51.0 (#113)
- Grok 4.20 (Non-Reasoning): 54.7 (#38)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Non-English | 1389 | 1440 |
| LMArena Chinese | 1416 | 1481 |
| LMArena Russian | 1407 | 1457 |
| LMArena Spanish | 1377 | 1442 |
| LMArena French | — | 1477 |
| LMArena German | — | 1463 |
| LMArena Japanese | — | 1450 |
| LMArena Korean | — | 1417 |

## Instruction Following

- GPT-6 Sol: 74.4 (#97)
- Grok 4.20 (Non-Reasoning): 75.0 (#79)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Instruction Following | 1406 | 1420 |

## Long Context

- GPT-6 Sol: 43.2 (#100)
- Grok 4.20 (Non-Reasoning): 45.4 (#33)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Longer Query | 1415 | 1436 |
| CL-bench | — | 22.2% |
| CL-bench Life | — | 11.9% |

## Writing & Preference

- GPT-6 Sol: 72.3 (#15)
- Grok 4.20 (Non-Reasoning): 65.9 (#42)

| Benchmark | GPT-6 Sol | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Text | 1396 | 1451 |
| LMArena Creative Writing | 1392 | 1439 |
| EQ-Bench Creative Writing | 2125 | 1574 |
| LMArena Multi-Turn | 1405 | 1456 |

## FAQ

### Is GPT-6 Sol better than Grok 4.20 (Non-Reasoning)?

GPT-6 Sol and Grok 4.20 (Non-Reasoning) score almost the same on the Noometry Index (49.2 vs 48.5), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-6 Sol or Grok 4.20 (Non-Reasoning)?

Grok 4.20 (Non-Reasoning) is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GPT-6 Sol lists at $2 and $10.

### Is GPT-6 Sol or Grok 4.20 (Non-Reasoning) better for coding?

GPT-6 Sol scores higher on coding benchmarks: 59.6 versus 41.8 in the Noometry coding category.

### Which has the bigger context window?

GPT-6 Sol does, with 1.05M tokens against 1M.

### How many benchmarks do GPT-6 Sol and Grok 4.20 (Non-Reasoning) share?

16 benchmarks have published results for both models. GPT-6 Sol has 22 scored results on Noometry and Grok 4.20 (Non-Reasoning) has 46.