# Claude Opus 4 vs GPT-5.1

> GPT-5.1 is the stronger model overall, scoring 48.8 to 42.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-vs-gpt-5-1
- Last updated: 2026-10-10
- Shared benchmarks: 45

## Summary

- They share 45 benchmarks with published results for both. Claude Opus 4 scores higher in 2 categories and GPT-5.1 in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in multimodal, where GPT-5.1 leads 44.0 to 30.9.
- The biggest single-benchmark swing is ARC-AGI-1: 35.7% for Claude Opus 4 and 72.8% for GPT-5.1.
- GPT-5.1 is cheaper at $1.25 / $10 per million input/output tokens, against $15 / $75 for Claude Opus 4.
- GPT-5.1 accepts more context: 400K tokens versus 200K.

## Snapshot

| | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 42.9 | 48.8 |
| Rank | 93 | 47 |
| Context | 200K | 400K |
| Input $/M | $15 | $1.25 |
| Output $/M | $75 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4: 47.8 (#55)
- GPT-5.1: 46.9 (#59)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| SWE-bench Verified | 70.7% | 68% |
| SWE-bench Verified (bash only) | 67.6% | 66% |
| GSO | 6.9% | 13.7% |
| WeirdML | 43.7% | 60.8% |
| LMArena Coding | 1442 | 1454 |
| Aider Polyglot | 72% | — |
| LMArena WebDev | — | 1395 |
| SciCode | — | 43.3% |
| LiveBench Coding | — | 72.5% |
| ALE-Bench | — | 1,192 |
| AlgoTune | 1.33 | — |

## Agentic & Tool Use

- Claude Opus 4: 34.5 (#39)
- GPT-5.1: 32.5 (#55)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| DeepResearch Bench | 46.8% | 42.8% |
| LMArena Search | 1127 | 1199 |
| Terminal-Bench | — | 47.6% |
| Cybench | 38% | — |
| METR Time Horizons | 63.9% | — |
| Vending-Bench 2 | — | 1,473 |

## Reasoning

- Claude Opus 4: 27.4 (#104)
- GPT-5.1: 39.9 (#50)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| ARC-AGI-2 | 8.6% | 17.6% |
| SimpleBench | 58.8% | 53.2% |
| ARC-AGI-1 | 35.7% | 72.8% |
| CritPt | 0.3% | 4.9% |
| EnigmaEval | 5.6% | 11.2% |
| LMArena Hard Prompts | 1399 | 1457 |
| DTBench | 81.6% | 90.1% |
| LMCA | 37.4% | 43.9% |
| Epoch Capabilities Index | 142.67 | 149.66 |
| ForecastBench | 61.1 | 58.1 |
| Kagi LLM Benchmark | 74.3% | — |
| Chess Puzzles | — | 32% |
| LiveBench Reasoning | — | 95.8% |
| Mystery Game Puzzles | — | 19% |
| LiveBench Data Analysis | — | 72.1% |
| LiveBench | — | 78.8% |

## Math

- Claude Opus 4: 40.2 (#80)
- GPT-5.1: 50.3 (#45)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 64.4% | 88.6% |
| Omni-MATH | 61.6% | 46.4% |
| LMArena Math | 1391 | 1446 |
| FrontierMath (Feb 2025 set) | 4.5% | 31% |
| FrontierMath Tier 4 (v1) | 4.2% | 12.5% |
| LiveBench Math | — | 94.5% |
| MATH Level 5 | 85% | — |

## Knowledge

- Claude Opus 4: 43.9 (#82)
- GPT-5.1: 50.5 (#65)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| GPQA Diamond | 76.3% | 87.6% |
| Humanity's Last Exam | 10.7% | 23.7% |
| MMLU-Pro | 87.5% | 57.9% |
| Vectara Hallucination Rate | 12% | 10.9% |
| GPQA (HELM) | 70.8% | 44.2% |
| LMArena Expert | 1384 | 1470 |
| SimpleQA Verified | — | 48% |
| Confabulations | 15.9% | — |

## Multimodal

- Claude Opus 4: 30.9 (#101)
- GPT-5.1: 44.0 (#17)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| LMArena Vision | 1192 | 1250 |
| VPCT | 38% | 58.7% |
| GeoBench | 49% | — |
| LMArena Document | — | 1403 |

## Multilingual

- Claude Opus 4: 49.0 (#133)
- GPT-5.1: 54.0 (#51)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| LMArena Non-English | 1362 | 1431 |
| LMArena Chinese | 1386 | 1495 |
| LMArena French | 1370 | 1451 |
| LMArena German | 1391 | 1439 |
| LMArena Japanese | 1332 | 1453 |
| LMArena Korean | 1318 | 1401 |
| LMArena Russian | 1392 | 1435 |
| LMArena Spanish | 1388 | 1430 |

## Instruction Following

- Claude Opus 4: 77.3 (#26)
- GPT-5.1: 84.0 (#1)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| IFEval | 91.8% | 93.5% |
| LMArena Instruction Following | 1406 | 1442 |
| LiveBench Instruction Following | — | 93.3% |

## Long Context

- Claude Opus 4: 39.5 (#167)
- GPT-5.1: 47.6 (#14)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| LMArena Longer Query | 1422 | 1448 |
| Fiction.LiveBench | 61.1% | — |
| CL-bench | — | 23.7% |
| CL-bench Life | — | 17.3% |

## Writing & Preference

- Claude Opus 4: 61.4 (#85)
- GPT-5.1: 64.7 (#53)

| Benchmark | Claude Opus 4 | GPT-5.1 |
|---|---|---|
| LMArena Text | 1377 | 1443 |
| LMArena Creative Writing | 1386 | 1427 |
| WildBench | 85.2% | 86.3% |
| LMArena Multi-Turn | 1396 | 1449 |
| Short-Story Creative Writing | 83.6% | — |
| EQ-Bench Creative Writing | 1580 | — |
| LiveBench Language | — | 80.2% |

## FAQ

### Is Claude Opus 4 better than GPT-5.1?

GPT-5.1 is the stronger model overall, scoring 48.8 to 42.9 on the Noometry Index.

### Which is cheaper, Claude Opus 4 or GPT-5.1?

GPT-5.1 is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; Claude Opus 4 lists at $15 and $75.

### Is Claude Opus 4 or GPT-5.1 better for coding?

They score almost the same on coding (47.8 vs 46.9); test both on your own repository before choosing.

### Which has the bigger context window?

GPT-5.1 does, with 400K tokens against 200K.

### How many benchmarks do Claude Opus 4 and GPT-5.1 share?

45 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and GPT-5.1 has 63.