# Claude Opus 4.1 vs GPT-4.5

> Claude Opus 4.1 is the stronger model overall, scoring 40.8 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-1-vs-gpt-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 28

## Summary

- They share 28 benchmarks with published results for both. Claude Opus 4.1 scores higher in 7 categories and GPT-4.5 in 3 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 4.1 leads 31.6 to 14.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.9% for Claude Opus 4.1 and 37.8% for GPT-4.5.

## Snapshot

| | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 40.8 | 36.9 |
| Rank | 136 | 200 |
| Context | 200K | — |
| Input $/M | $15 | — |
| Output $/M | $75 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4.1: 44.3 (#69)
- GPT-4.5: 41.8 (#102)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| WeirdML | 45.9% | 39.4% |
| LMArena Coding | 1479 | 1397 |
| SWE-bench Verified | 73.3% | — |
| Aider Polyglot | — | 44.9% |
| LMArena WebDev | 1390 | — |
| LiveBench Coding | — | 75.2% |
| ALE-Bench | 674.77 | — |
| AlgoTune | 1.34 | — |

## Agentic & Tool Use

- Claude Opus 4.1: 34.8 (#38)
- GPT-4.5: 27.6 (#92)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| Cybench | 42% | 17.5% |
| Terminal-Bench | 38% | — |
| GDPval | 43.6% | — |
| DeepResearch Bench | 48.3% | — |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |

## Reasoning

- Claude Opus 4.1: 31.6 (#70)
- GPT-4.5: 14.1 (#320)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| SimpleBench | 60% | 34.5% |
| EnigmaEval | 7.2% | 3.2% |
| LMArena Hard Prompts | 1443 | 1404 |
| Epoch Capabilities Index | 144.11 | 136.74 |
| ForecastBench | 62 | 61.7 |
| ARC-AGI-2 | — | 0.8% |
| ARC-AGI-1 | — | 10.3% |
| Chess Puzzles | 7% | — |
| EBR-Bench | 7.9% | — |
| LiveBench Reasoning | — | 71.1% |
| Mystery Game Puzzles | 21% | — |
| DTBench | 80% | — |
| LiveBench Data Analysis | — | 64.3% |
| LMCA | 37.1% | — |
| LiveBench | — | 69% |

## Math

- Claude Opus 4.1: 22.0 (#267)
- GPT-4.5: 31.0 (#200)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.9% | 37.8% |
| LMArena Math | 1430 | 1412 |
| FrontierMath (Tiers 1-3) | 12.6% | — |
| FrontierMath Tier 4 | 2.4% | — |
| LiveBench Math | — | 69.3% |
| MATH Level 5 | — | 78.6% |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4.1: 41.9 (#93)
- GPT-4.5: 32.4 (#205)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| GPQA Diamond | 77.3% | 68.7% |
| Humanity's Last Exam | 11.5% | 5.4% |
| Confabulations | 17.1% | 13.6% |
| LMArena Expert | 1439 | 1394 |
| Vectara Hallucination Rate | 11.8% | — |

## Multimodal

- Claude Opus 4.1: 26.2 (#114)
- GPT-4.5: 37.0 (#68)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| VPCT | 35% | 45% |
| LMArena Vision | — | 1195 |

## Multilingual

- Claude Opus 4.1: 52.1 (#90)
- GPT-4.5: 52.7 (#78)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| LMArena Non-English | 1405 | 1413 |
| LMArena Chinese | 1427 | 1421 |
| LMArena French | 1432 | 1417 |
| LMArena German | 1412 | 1457 |
| LMArena Japanese | 1378 | 1416 |
| LMArena Korean | 1381 | 1392 |
| LMArena Russian | 1421 | 1419 |
| LMArena Spanish | 1448 | — |

## Instruction Following

- Claude Opus 4.1: 75.8 (#53)
- GPT-4.5: 72.8 (#129)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| LMArena Instruction Following | 1436 | 1404 |
| LiveBench Instruction Following | — | 72.3% |

## Long Context

- Claude Opus 4.1: 44.5 (#60)
- GPT-4.5: 40.4 (#150)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| LMArena Longer Query | 1455 | 1406 |
| Fiction.LiveBench | — | 63.9% |

## Writing & Preference

- Claude Opus 4.1: 62.6 (#70)
- GPT-4.5: 57.1 (#129)

| Benchmark | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| LMArena Text | 1419 | 1417 |
| LMArena Creative Writing | 1412 | 1394 |
| Short-Story Creative Writing | 84.7% | 75.6% |
| LMArena Multi-Turn | 1444 | 1444 |
| EQ-Bench Creative Writing | — | 1258 |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Claude Opus 4.1 better than GPT-4.5?

Claude Opus 4.1 is the stronger model overall, scoring 40.8 to 36.9 on the Noometry Index.

### Is Claude Opus 4.1 or GPT-4.5 better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.3 versus 41.8 in the Noometry coding category.

### How many benchmarks do Claude Opus 4.1 and GPT-4.5 share?

28 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and GPT-4.5 has 42.