Model comparison
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.
Last verified . 11 shared benchmarks.
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.
Side by side
| Chatgpt 4o Latest 20250326 | Mercury 2 | |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 43.8 | 39.1 |
| Released | — | 2026-02-20 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 50K |
| Input $ / M tokens | — | $0.25 |
| Output $ / M tokens | — | $0.75 |
| Results tracked | 21 | 17 |
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Category by category
Coding Chatgpt 4o Latest 20250326 leads
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 leads
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 Not comparable
Chatgpt 4o Latest 20250326: 38.6 (#134), Mercury 2: —
| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Math | 1407 | — |
Knowledge Chatgpt 4o Latest 20250326 leads
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 Not comparable
Chatgpt 4o Latest 20250326: 39.6 (#58), Mercury 2: —
| Benchmark | Chatgpt 4o Latest 20250326 | Mercury 2 |
|---|---|---|
| LMArena Vision | 1243 | — |
Multilingual Chatgpt 4o Latest 20250326 leads
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 leads
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 leads
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 leads
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 | — |
Frequently asked questions
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.