Model comparison
Claude Opus 5 vs GPT-4.5
Claude Opus 5 is the stronger model overall, scoring 67.8 to 37.2 on the Noometry Index.
Last verified . 25 shared benchmarks.
Summary
- They share 25 benchmarks with published results for both. Claude Opus 5 scores higher in 10 categories and GPT-4.5 in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 5 leads 77.2 to 13.9.
- The biggest single-benchmark swing is ARC-AGI-2: 90.4% for Claude Opus 5 and 0.8% for GPT-4.5.
Side by side
| Claude Opus 5 | GPT-4.5 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 67.8 | 37.2 |
| Released | 2026-07-24 | 2025-02-27 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $5 | — |
| Output $ / M tokens | $25 | — |
| Results tracked | 57 | 42 |
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Category by category
Coding Claude Opus 5 leads
Claude Opus 5: 67.5 (#5), GPT-4.5: 42.2 (#109)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| WeirdML | 91.8% | 39.4% |
| LMArena Coding | 1534 | 1396 |
| DeepSWE | 73.6% | — |
| FrontierCode | 53.4% | — |
| Aider Polyglot | — | 44.9% |
| CursorBench | 46.6% | — |
| LMArena WebDev | 1691 | — |
| FrontierSWE | 52% | — |
| SciCode | 56.4% | — |
| LiveBench Coding | — | 75.2% |
| ALE-Bench | 2,165 | — |
Agentic & Tool Use Claude Opus 5 leads
Claude Opus 5: 55.6 (#1), GPT-4.5: 27.9 (#97)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| APEX-Agents | 65.8% | — |
| OSWorld 2.0 | 31.4% | — |
| τ²-bench Banking | 48.7% | — |
| Cybench | — | 17.5% |
| PostTrainBench | 35% | — |
| BALROG | 63.4% | — |
| GBAEval | 79.6% | — |
| GDP.pdf | 24% | — |
| Vending-Bench 2 | 11,182 | — |
Reasoning Claude Opus 5 leads
Claude Opus 5: 77.2 (#4), GPT-4.5: 13.9 (#330)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| ARC-AGI-2 | 90.4% | 0.8% |
| SimpleBench | 80.6% | 34.5% |
| ARC-AGI-1 | 97.5% | 10.3% |
| LMArena Hard Prompts | 1526 | 1403 |
| Epoch Capabilities Index | 162.78 | 136.74 |
| NYT Connections (extended) | 94.3% | — |
| CritPt | 29.1% | — |
| Chess Puzzles | 42% | — |
| EnigmaEval | — | 3.2% |
| EBR-Bench | 45.7% | — |
| LiveBench Reasoning | — | 71.1% |
| Mystery Game Puzzles | 59% | — |
| DTBench | 97.9% | — |
| LiveBench Data Analysis | — | 64.3% |
| LMCA | 64.5% | — |
| Bench to the Future 3 | 0.12 | — |
| ForecastBench | — | 61.7 |
| LiveBench | — | 69% |
Math Claude Opus 5 leads
Claude Opus 5: 86.2 (#8), GPT-4.5: 32.6 (#211)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 37.8% |
| LMArena Math | 1531 | 1412 |
| FrontierMath (Tiers 1-3) | 85.6% | — |
| FrontierMath Tier 4 | 73.2% | — |
| ProofBench | 99% | — |
| LiveBench Math | — | 69.3% |
| MATH Level 5 | — | 78.6% |
Knowledge Claude Opus 5 leads
Claude Opus 5: 66.8 (#9), GPT-4.5: 32.5 (#211)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| GPQA Diamond | 93.9% | 68.7% |
| LMArena Expert | 1557 | 1394 |
| Humanity's Last Exam | — | 5.4% |
| SimpleQA Verified | 59.9% | — |
| Confabulations | — | 13.6% |
Multimodal Claude Opus 5 leads
Claude Opus 5: 50.8 (#8), GPT-4.5: 37.6 (#71)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| LMArena Vision | 1319 | 1195 |
| VPCT | — | 45% |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
| LMArena Document | 1516 | — |
Multilingual Claude Opus 5 leads
Claude Opus 5: 58.8 (#4), GPT-4.5: 52.5 (#83)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| LMArena Non-English | 1501 | 1413 |
| LMArena Chinese | 1574 | 1421 |
| LMArena French | 1519 | 1418 |
| LMArena German | 1524 | 1457 |
| LMArena Japanese | 1516 | 1416 |
| LMArena Korean | 1521 | 1392 |
| LMArena Russian | 1507 | 1419 |
| LMArena Spanish | 1519 | — |
Instruction Following Claude Opus 5 leads
Claude Opus 5: 79.2 (#7), GPT-4.5: 72.6 (#134)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| LMArena Instruction Following | 1517 | 1404 |
| LiveBench Instruction Following | — | 72.3% |
Long Context Claude Opus 5 leads
Claude Opus 5: 46.5 (#21), GPT-4.5: 40.4 (#155)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| LMArena Longer Query | 1515 | 1406 |
| Fiction.LiveBench | — | 63.9% |
Writing & Preference Claude Opus 5 leads
Claude Opus 5: 79.2 (#1), GPT-4.5: 56.9 (#134)
| Benchmark | Claude Opus 5 | GPT-4.5 |
|---|---|---|
| LMArena Text | 1507 | 1417 |
| LMArena Creative Writing | 1491 | 1394 |
| EQ-Bench Creative Writing | 2133 | 1258 |
| LMArena Multi-Turn | 1499 | 1444 |
| Short-Story Creative Writing | — | 75.6% |
| EQ-Bench 4 | 1385 | — |
| LiveBench Language | — | 61.5% |
Frequently asked questions
Is Claude Opus 5 better than GPT-4.5?
Claude Opus 5 is the stronger model overall, scoring 67.8 to 37.2 on the Noometry Index.
Is Claude Opus 5 or GPT-4.5 better for coding?
Claude Opus 5 scores higher on coding benchmarks: 67.5 versus 42.2 in the Noometry coding category.
How many benchmarks do Claude Opus 5 and GPT-4.5 share?
25 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and GPT-4.5 has 42.