# GPT-4.5 vs Mercury 2.5

> GPT-4.5 has enough public results to be ranked (#200); Mercury 2.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-mercury-2-5
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where GPT-4.5 leads 31.0 to 22.4.

## Snapshot

| | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 36.9 | 30.2 |
| Rank | 200 | — |
| Context | — | 260K |
| Input $/M | — | $0.04 |
| Output $/M | — | $0.15 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4.5: 41.8 (#102)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| Aider Polyglot | 44.9% | — |
| WeirdML | 39.4% | — |
| LiveBench Coding | 75.2% | — |
| LMArena Coding | 1397 | — |
| ALE-Bench | — | 301.65 |

## Agentic & Tool Use

- GPT-4.5: 27.6 (#92)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| Cybench | 17.5% | — |

## Reasoning

- GPT-4.5: 14.1 (#320)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| ARC-AGI-1 | 10.3% | — |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| LMArena Hard Prompts | 1404 | — |
| LiveBench Data Analysis | 64.3% | — |
| Epoch Capabilities Index | 136.74 | — |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 31.0 (#200)
- Mercury 2.5: 22.4

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | — |
| ProofBench | — | 3% |
| LiveBench Math | 69.3% | — |
| LMArena Math | 1412 | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.4 (#205)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| GPQA Diamond | 68.7% | — |
| Humanity's Last Exam | 5.4% | — |
| Confabulations | 13.6% | — |
| LMArena Expert | 1394 | — |

## Multimodal

- GPT-4.5: 37.0 (#68)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1195 | — |
| VPCT | 45% | — |

## Multilingual

- GPT-4.5: 52.7 (#78)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1413 | — |
| LMArena Chinese | 1421 | — |
| LMArena French | 1417 | — |
| LMArena German | 1457 | — |
| LMArena Japanese | 1416 | — |
| LMArena Korean | 1392 | — |
| LMArena Russian | 1419 | — |

## Instruction Following

- GPT-4.5: 72.8 (#129)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| LiveBench Instruction Following | 72.3% | — |
| LMArena Instruction Following | 1404 | — |

## Long Context

- GPT-4.5: 40.4 (#150)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| Fiction.LiveBench | 63.9% | — |
| LMArena Longer Query | 1406 | — |

## Writing & Preference

- GPT-4.5: 57.1 (#129)
- Mercury 2.5: —

| Benchmark | GPT-4.5 | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1417 | — |
| LMArena Creative Writing | 1394 | — |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench Creative Writing | 1258 | — |
| LMArena Multi-Turn | 1444 | — |
| LiveBench Language | 61.5% | — |

## FAQ

### Is GPT-4.5 better than Mercury 2.5?

GPT-4.5 has enough public results to be ranked (#200); Mercury 2.5 does not yet, so treat this comparison as directional.

### How many benchmarks do GPT-4.5 and Mercury 2.5 share?

0 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Mercury 2.5 has 2.