# Chatgpt 4o Latest 20250326 vs Grok 4 Fast

> Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 39.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-grok-4-fast
- Last updated: 2026-10-11
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 6 categories and Grok 4 Fast in 2 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 43.1.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 66.1% for Grok 4 Fast.

## Snapshot

| | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 43.8 | 39.4 |
| Rank | 82 | 167 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.6 (#122)
- Grok 4 Fast: 32.5 (#271)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1413 | 1429 |
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- Grok 4 Fast: 29.5 (#86)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- Chatgpt 4o Latest 20250326: 33.8 (#71)
- Grok 4 Fast: 22.2 (#201)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| Kagi LLM Benchmark | 75% | 66.1% |
| LMArena Hard Prompts | 1424 | 1412 |
| ARC-AGI-2 | — | 5.3% |
| ARC-AGI-1 | — | 48.5% |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.2 |
| ForecastBench | — | 60.5 |

## Math

- Chatgpt 4o Latest 20250326: 38.6 (#134)
- Grok 4 Fast: 38.9 (#123)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1407 | 1419 |

## Knowledge

- Chatgpt 4o Latest 20250326: 39.2 (#137)
- Grok 4 Fast: 32.0 (#214)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1401 | 1411 |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 19.7% |

## Multimodal

- Chatgpt 4o Latest 20250326: 39.6 (#58)
- Grok 4 Fast: —

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1243 | — |

## Multilingual

- Chatgpt 4o Latest 20250326: 52.9 (#76)
- Grok 4 Fast: 51.3 (#111)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1419 | 1396 |
| LMArena Chinese | 1457 | 1457 |
| LMArena French | 1446 | 1431 |
| LMArena German | 1423 | 1383 |
| LMArena Japanese | 1405 | 1352 |
| LMArena Korean | 1396 | 1357 |
| LMArena Russian | 1429 | 1389 |
| LMArena Spanish | 1434 | 1415 |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.0 (#107)
- Grok 4 Fast: 73.2 (#121)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1403 | 1387 |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#107)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1413 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.6 (#72)
- Grok 4 Fast: 60.0 (#102)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1429 | 1407 |
| LMArena Creative Writing | 1405 | 1387 |
| LMArena Multi-Turn | 1454 | 1414 |
| EQ-Bench Creative Writing | 1501 | — |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than Grok 4 Fast?

Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 39.4 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or Grok 4 Fast better for coding?

Chatgpt 4o Latest 20250326 scores higher on coding benchmarks: 41.6 versus 32.5 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and Grok 4 Fast share?

18 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Grok 4 Fast has 30.