# Claude Opus 4 vs GPT-4.5

> Claude Opus 4 is the stronger model overall, scoring 42.9 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-vs-gpt-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 35

## Summary

- They share 35 benchmarks with published results for both. Claude Opus 4 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 leads 27.4 to 14.1.
- The biggest single-benchmark swing is Aider Polyglot: 72% for Claude Opus 4 and 44.9% for GPT-4.5.

## Snapshot

| | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 42.9 | 36.9 |
| Rank | 93 | 200 |
| Context | 200K | — |
| Input $/M | $15 | — |
| Output $/M | $75 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4: 47.8 (#55)
- GPT-4.5: 41.8 (#102)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| Aider Polyglot | 72% | 44.9% |
| WeirdML | 43.7% | 39.4% |
| LMArena Coding | 1442 | 1397 |
| SWE-bench Verified | 70.7% | — |
| SWE-bench Verified (bash only) | 67.6% | — |
| GSO | 6.9% | — |
| LiveBench Coding | — | 75.2% |
| AlgoTune | 1.33 | — |

## Agentic & Tool Use

- Claude Opus 4: 34.5 (#39)
- GPT-4.5: 27.6 (#92)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| Cybench | 38% | 17.5% |
| DeepResearch Bench | 46.8% | — |
| LMArena Search | 1127 | — |
| METR Time Horizons | 63.9% | — |

## Reasoning

- Claude Opus 4: 27.4 (#104)
- GPT-4.5: 14.1 (#320)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| ARC-AGI-2 | 8.6% | 0.8% |
| SimpleBench | 58.8% | 34.5% |
| ARC-AGI-1 | 35.7% | 10.3% |
| EnigmaEval | 5.6% | 3.2% |
| LMArena Hard Prompts | 1399 | 1404 |
| Epoch Capabilities Index | 142.67 | 136.74 |
| ForecastBench | 61.1 | 61.7 |
| Kagi LLM Benchmark | 74.3% | — |
| CritPt | 0.3% | — |
| LiveBench Reasoning | — | 71.1% |
| DTBench | 81.6% | — |
| LiveBench Data Analysis | — | 64.3% |
| LMCA | 37.4% | — |
| LiveBench | — | 69% |

## Math

- Claude Opus 4: 40.2 (#80)
- GPT-4.5: 31.0 (#200)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 64.4% | 37.8% |
| LMArena Math | 1391 | 1412 |
| MATH Level 5 | 85% | 78.6% |
| Omni-MATH | 61.6% | — |
| LiveBench Math | — | 69.3% |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4: 43.9 (#82)
- GPT-4.5: 32.4 (#205)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| GPQA Diamond | 76.3% | 68.7% |
| Humanity's Last Exam | 10.7% | 5.4% |
| Confabulations | 15.9% | 13.6% |
| LMArena Expert | 1384 | 1394 |
| MMLU-Pro | 87.5% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |

## Multimodal

- Claude Opus 4: 30.9 (#101)
- GPT-4.5: 37.0 (#68)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| LMArena Vision | 1192 | 1195 |
| VPCT | 38% | 45% |
| GeoBench | 49% | — |

## Multilingual

- Claude Opus 4: 49.0 (#133)
- GPT-4.5: 52.7 (#78)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| LMArena Non-English | 1362 | 1413 |
| LMArena Chinese | 1386 | 1421 |
| LMArena French | 1370 | 1417 |
| LMArena German | 1391 | 1457 |
| LMArena Japanese | 1332 | 1416 |
| LMArena Korean | 1318 | 1392 |
| LMArena Russian | 1392 | 1419 |
| LMArena Spanish | 1388 | — |

## Instruction Following

- Claude Opus 4: 77.3 (#26)
- GPT-4.5: 72.8 (#129)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1404 |
| LiveBench Instruction Following | — | 72.3% |
| IFEval | 91.8% | — |

## Long Context

- Claude Opus 4: 39.5 (#167)
- GPT-4.5: 40.4 (#150)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| Fiction.LiveBench | 61.1% | 63.9% |
| LMArena Longer Query | 1422 | 1406 |

## Writing & Preference

- Claude Opus 4: 61.4 (#85)
- GPT-4.5: 57.1 (#129)

| Benchmark | Claude Opus 4 | GPT-4.5 |
|---|---|---|
| LMArena Text | 1377 | 1417 |
| LMArena Creative Writing | 1386 | 1394 |
| Short-Story Creative Writing | 83.6% | 75.6% |
| EQ-Bench Creative Writing | 1580 | 1258 |
| LMArena Multi-Turn | 1396 | 1444 |
| WildBench | 85.2% | — |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Claude Opus 4 better than GPT-4.5?

Claude Opus 4 is the stronger model overall, scoring 42.9 to 36.9 on the Noometry Index.

### Is Claude Opus 4 or GPT-4.5 better for coding?

Claude Opus 4 scores higher on coding benchmarks: 47.8 versus 41.8 in the Noometry coding category.

### How many benchmarks do Claude Opus 4 and GPT-4.5 share?

35 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and GPT-4.5 has 42.