# GPT-6 Sol vs Grok 4.1 Fast

> GPT-6 Sol is the stronger model overall, scoring 49.2 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 15× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-6-sol-vs-grok-4-1-fast
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-6 Sol scores higher in 8 categories and Grok 4.1 Fast in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-6 Sol leads 59.6 to 33.8.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 6.5% for GPT-6 Sol and 17.8% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
- GPT-6 Sol accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 49.2 | 40.9 |
| Rank | 46 | 131 |
| Context | 1.05M | 128K |
| Input $/M | $2 | $0.20 |
| Output $/M | $10 | $0.50 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-6 Sol: 59.6 (#11)
- Grok 4.1 Fast: 33.8 (#236)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1692 | 1241 |
| LMArena Coding | 1453 | 1411 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| ALE-Bench | — | 394.93 |

## Agentic & Tool Use

- GPT-6 Sol: 33.5 (#49)
- Grok 4.1 Fast: 36.1 (#35)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| GDP.pdf | 28% | — |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |

## Reasoning

- GPT-6 Sol: 49.3 (#34)
- Grok 4.1 Fast: 42.3 (#45)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| NYT Connections (extended) | 90.1% | 87.4% |
| LMArena Hard Prompts | 1420 | 1407 |
| SimpleBench | — | 56% |
| EBR-Bench | 53.3% | — |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |

## Math

- GPT-6 Sol: 35.8 (#135)
- Grok 4.1 Fast: 30.9 (#201)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1404 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |

## Knowledge

- GPT-6 Sol: 43.0 (#87)
- Grok 4.1 Fast: 32.6 (#203)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 6.5% | 17.8% |
| LMArena Expert | 1449 | 1398 |

## Multimodal

- GPT-6 Sol: 47.6 (#9)
- Grok 4.1 Fast: 36.3 (#71)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |
| Furniture Assembly | 58.3% | — |

## Multilingual

- GPT-6 Sol: 51.0 (#113)
- Grok 4.1 Fast: 51.1 (#110)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1389 | 1391 |
| LMArena Chinese | 1416 | 1441 |
| LMArena Russian | 1407 | 1387 |
| LMArena Spanish | 1377 | 1411 |
| LMArena French | — | 1416 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1347 |
| LMArena Korean | — | 1361 |

## Instruction Following

- GPT-6 Sol: 74.4 (#97)
- Grok 4.1 Fast: 72.8 (#127)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1406 | 1376 |

## Long Context

- GPT-6 Sol: 43.2 (#100)
- Grok 4.1 Fast: 42.4 (#121)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1415 | 1390 |

## Writing & Preference

- GPT-6 Sol: 72.3 (#15)
- Grok 4.1 Fast: 57.4 (#126)

| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1396 | 1408 |
| LMArena Creative Writing | 1392 | 1394 |
| EQ-Bench Creative Writing | 2125 | 1327 |
| LMArena Multi-Turn | 1405 | 1389 |

## FAQ

### Is GPT-6 Sol better than Grok 4.1 Fast?

GPT-6 Sol is the stronger model overall, scoring 49.2 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 15× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.

### Which is cheaper, GPT-6 Sol or Grok 4.1 Fast?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; GPT-6 Sol lists at $2 and $10.

### Is GPT-6 Sol or Grok 4.1 Fast better for coding?

GPT-6 Sol scores higher on coding benchmarks: 59.6 versus 33.8 in the Noometry coding category.

### Which has the bigger context window?

GPT-6 Sol does, with 1.05M tokens against 128K.

### How many benchmarks do GPT-6 Sol and Grok 4.1 Fast share?

17 benchmarks have published results for both models. GPT-6 Sol has 22 scored results on Noometry and Grok 4.1 Fast has 32.