# Chatgpt 4o Latest 20250326 vs Mercury 2

> Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 39.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-mercury-2
- Last updated: 2026-10-11
- Shared benchmarks: 11

## Summary

- They share 11 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 7 categories and Mercury 2 in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Chatgpt 4o Latest 20250326 leads 33.8 to 23.8.

## Snapshot

| | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 43.8 | 39.1 |
| Rank | 82 | 175 |
| Context | — | 128K |
| Input $/M | — | $0.25 |
| Output $/M | — | $0.75 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.6 (#122)
- Mercury 2: 33.5 (#255)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Coding | 1413 | 1391 |
| LMArena WebDev | — | 1171 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |

## Reasoning

- Chatgpt 4o Latest 20250326: 33.8 (#71)
- Mercury 2: 23.8 (#170)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1424 | 1362 |
| Kagi LLM Benchmark | 75% | — |
| CritPt | — | 0.8% |

## Math

- Chatgpt 4o Latest 20250326: 38.6 (#134)
- Mercury 2: —

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Math | 1407 | — |

## Knowledge

- Chatgpt 4o Latest 20250326: 39.2 (#137)
- Mercury 2: 36.2 (#172)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Expert | 1401 | 1358 |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 12.3% |

## Multimodal

- Chatgpt 4o Latest 20250326: 39.6 (#58)
- Mercury 2: —

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Vision | 1243 | — |

## Multilingual

- Chatgpt 4o Latest 20250326: 52.9 (#76)
- Mercury 2: 46.6 (#157)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1419 | 1331 |
| LMArena Chinese | 1457 | 1417 |
| LMArena Russian | 1429 | 1304 |
| LMArena French | 1446 | — |
| LMArena German | 1423 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1396 | — |
| LMArena Spanish | 1434 | — |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.0 (#107)
- Mercury 2: 70.2 (#165)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1329 |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#107)
- Mercury 2: 40.5 (#154)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1413 | 1330 |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.6 (#72)
- Mercury 2: 53.8 (#155)

| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Text | 1429 | 1355 |
| LMArena Creative Writing | 1405 | 1289 |
| LMArena Multi-Turn | 1454 | 1358 |
| EQ-Bench Creative Writing | 1501 | — |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than Mercury 2?

Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 39.1 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or Mercury 2 better for coding?

Chatgpt 4o Latest 20250326 scores higher on coding benchmarks: 41.6 versus 33.5 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and Mercury 2 share?

11 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Mercury 2 has 17.