# GPT-4.5 vs o3-pro

> o3-pro is the stronger model overall, scoring 42.9 to 37.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-o3-pro
- Last updated: 2026-10-11
- Shared benchmarks: 8

## Summary

- They share 8 benchmarks with published results for both. GPT-4.5 scores higher in 1 category and o3-pro in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.2 to 40.4.
- The biggest single-benchmark swing is ARC-AGI-1: 10.3% for GPT-4.5 and 59.3% for o3-pro.

## Snapshot

| | GPT-4.5 | o3-pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 37.2 | 42.9 |
| Rank | 208 | 105 |
| Context | — | 200K |
| Input $/M | — | $20 |
| Output $/M | — | $80 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4.5: 42.2 (#109)
- o3-pro: 55.5 (#24)

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| Aider Polyglot | 44.9% | 84.9% |
| WeirdML | 39.4% | 58.2% |
| LiveBench Coding | 75.2% | — |
| LMArena Coding | 1396 | — |

## Agentic & Tool Use

- GPT-4.5: 27.9 (#97)
- o3-pro: —

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| Cybench | 17.5% | — |

## Reasoning

- GPT-4.5: 13.9 (#330)
- o3-pro: 23.8 (#171)

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| ARC-AGI-2 | 0.8% | 4.9% |
| ARC-AGI-1 | 10.3% | 59.3% |
| Epoch Capabilities Index | 136.74 | 147.42 |
| SimpleBench | 34.5% | — |
| Kagi LLM Benchmark | — | 72.1% |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| LMArena Hard Prompts | 1403 | — |
| DTBench | — | 86.9% |
| LiveBench Data Analysis | 64.3% | — |
| LMCA | — | 38.5% |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 32.6 (#211)
- o3-pro: —

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | — |
| LiveBench Math | 69.3% | — |
| LMArena Math | 1412 | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.5 (#211)
- o3-pro: 29.5 (#238)

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| Confabulations | 13.6% | 14.2% |
| GPQA Diamond | 68.7% | — |
| Humanity's Last Exam | 5.4% | — |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1394 | — |

## Multimodal

- GPT-4.5: 37.6 (#71)
- o3-pro: —

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| LMArena Vision | 1195 | — |
| VPCT | 45% | — |

## Multilingual

- GPT-4.5: 52.5 (#83)
- o3-pro: —

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| LMArena Non-English | 1413 | — |
| LMArena Chinese | 1421 | — |
| LMArena French | 1418 | — |
| LMArena German | 1457 | — |
| LMArena Japanese | 1416 | — |
| LMArena Korean | 1392 | — |
| LMArena Russian | 1419 | — |

## Instruction Following

- GPT-4.5: 72.6 (#134)
- o3-pro: —

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| LiveBench Instruction Following | 72.3% | — |
| LMArena Instruction Following | 1404 | — |

## Long Context

- GPT-4.5: 40.4 (#155)
- o3-pro: 72.2 (#1)

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| Fiction.LiveBench | 63.9% | 97.2% |
| LMArena Longer Query | 1406 | — |

## Writing & Preference

- GPT-4.5: 56.9 (#134)
- o3-pro: 57.1 (#133)

| Benchmark | GPT-4.5 | o3-pro |
|---|---|---|
| Short-Story Creative Writing | 75.6% | 84.4% |
| LMArena Text | 1417 | — |
| LMArena Creative Writing | 1394 | — |
| EQ-Bench Creative Writing | 1258 | — |
| LMArena Multi-Turn | 1444 | — |
| LiveBench Language | 61.5% | — |

## FAQ

### Is GPT-4.5 better than o3-pro?

o3-pro is the stronger model overall, scoring 42.9 to 37.2 on the Noometry Index.

### Is GPT-4.5 or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.5 versus 42.2 in the Noometry coding category.

### How many benchmarks do GPT-4.5 and o3-pro share?

8 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and o3-pro has 12.