# Chatgpt 4o Latest 20250326 vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 43.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-grok-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 1 category and Grok 4.5 in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.5 leads 62.3 to 39.2.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 83.5% for Grok 4.5.

## Snapshot

| | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 43.8 | 55.0 |
| Rank | 82 | 25 |
| Context | — | 500K |
| Input $/M | — | $2 |
| Output $/M | — | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.6 (#122)
- Grok 4.5: 52.2 (#35)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Coding | 1413 | 1474 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| LMArena WebDev | — | 1553 |
| SciCode | — | 54.1% |
| WeirdML | — | 46.4% |
| ALE-Bench | — | 1,309 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- Grok 4.5: 44.4 (#17)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| LMArena Search | — | 1213 |
| Vending-Bench 2 | — | 3,887 |

## Reasoning

- Chatgpt 4o Latest 20250326: 33.8 (#71)
- Grok 4.5: 56.1 (#25)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| Kagi LLM Benchmark | 75% | 83.5% |
| LMArena Hard Prompts | 1424 | 1462 |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| NYT Connections (extended) | — | 79.9% |
| ARC-AGI-1 | — | 87.2% |
| CritPt | — | 15.4% |
| Chess Puzzles | — | 36% |
| DTBench | — | 96.5% |
| LMCA | — | 45.2% |
| Surface Evolver Bench | — | 74.4% |
| Epoch Capabilities Index | — | 153.92 |

## Math

- Chatgpt 4o Latest 20250326: 38.6 (#134)
- Grok 4.5: 60.9 (#35)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Math | 1407 | 1459 |
| FrontierMath (Tiers 1-3) | — | 57.2% |
| FrontierMath Tier 4 | — | 24.4% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |
| ProofBench | — | 31% |

## Knowledge

- Chatgpt 4o Latest 20250326: 39.2 (#137)
- Grok 4.5: 62.3 (#24)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Expert | 1401 | 1466 |
| GPQA Diamond | — | 93.4% |
| SimpleQA Verified | — | 48.3% |
| Confabulations | 16.6% | — |

## Multimodal

- Chatgpt 4o Latest 20250326: 39.6 (#58)
- Grok 4.5: 37.6 (#72)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1243 | 1288 |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |

## Multilingual

- Chatgpt 4o Latest 20250326: 52.9 (#76)
- Grok 4.5: 54.4 (#42)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1419 | 1440 |
| LMArena Chinese | 1457 | 1496 |
| LMArena French | 1446 | 1456 |
| LMArena German | 1423 | 1446 |
| LMArena Japanese | 1405 | 1428 |
| LMArena Korean | 1396 | 1404 |
| LMArena Russian | 1429 | 1448 |
| LMArena Spanish | 1434 | 1450 |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.0 (#107)
- Grok 4.5: 76.0 (#48)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1446 |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#107)
- Grok 4.5: 44.8 (#56)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1413 | 1463 |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.6 (#72)
- Grok 4.5: 65.8 (#42)

| Benchmark | Chatgpt 4o Latest 20250326 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1429 | 1448 |
| LMArena Creative Writing | 1405 | 1442 |
| EQ-Bench Creative Writing | 1501 | 1579 |
| LMArena Multi-Turn | 1454 | 1456 |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 43.8 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 41.6 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and Grok 4.5 share?

20 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Grok 4.5 has 52.