Model comparison
Claude Opus 4.5 vs o1-mini
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 33.7 on the Noometry Index.
Last verified . 26 shared benchmarks.
Summary
- They share 26 benchmarks with published results for both. Claude Opus 4.5 scores higher in 9 categories and o1-mini in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 4.5 leads 42.5 to 8.9.
- The biggest single-benchmark swing is Cybench: 82% for Claude Opus 4.5 and 10% for o1-mini.
Side by side
| Claude Opus 4.5 | o1-mini | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 50.5 | 33.7 |
| Released | 2025-11-01 | 2024-09-12 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | — |
| Max output | 64K | — |
| Input $ / M tokens | $5 | — |
| Output $ / M tokens | $25 | — |
| Results tracked | 69 | 39 |
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Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.5: 55.4 (#21), o1-mini: 35.1 (#218)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| WeirdML | 63.7% | 36.3% |
| LMArena Coding | 1504 | 1362 |
| SWE-bench Verified | 76.7% | — |
| SWE-bench Verified (bash only) | 76.8% | — |
| Aider Polyglot | — | 32.9% |
| LMArena WebDev | 1493 | — |
| SWE-bench Multilingual | 70.7% | — |
| GSO | 26.5% | — |
| LiveBench Coding | — | 48% |
| ALE-Bench | 1,025 | — |
| AlgoTune | 1.77 | — |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |
Agentic & Tool Use Claude Opus 4.5 leads
Claude Opus 4.5: 47.2 (#11), o1-mini: 24.3 (#112)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| Cybench | 82% | 10% |
| Terminal-Bench | 63.1% | — |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Banking | 24.7% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |
Reasoning Claude Opus 4.5 leads
Claude Opus 4.5: 42.5 (#43), o1-mini: 8.9 (#340)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| ARC-AGI-2 | 37.6% | 0.8% |
| SimpleBench | 62% | 18.1% |
| ARC-AGI-1 | 80% | 14% |
| LMArena Hard Prompts | 1476 | 1333 |
| Epoch Capabilities Index | 150.1 | 135.82 |
| Kagi LLM Benchmark | 80.2% | — |
| NYT Connections (extended) | 52.5% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| LiveBench Reasoning | — | 72.3% |
| Mystery Game Puzzles | 22% | — |
| DTBench | 89.9% | — |
| LiveBench Data Analysis | — | 57.9% |
| LMCA | 44.5% | — |
| ForecastBench | 60.7 | — |
| LiveBench | — | 57.8% |
Math Claude Opus 4.5 leads
Claude Opus 4.5: 38.5 (#85), o1-mini: 33.7 (#168)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.1% | 46.9% |
| LMArena Math | 1463 | 1358 |
| FrontierMath (Feb 2025 set) | 20.7% | 1.7% |
| FrontierMath (Tiers 1-3) | 34.4% | — |
| FrontierMath Tier 4 | 4.9% | — |
| ProofBench | 36% | — |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Opus 4.5 leads
Claude Opus 4.5: 56.4 (#38), o1-mini: 34.8 (#180)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| GPQA Diamond | 86% | 62.4% |
| LMArena Expert | 1488 | 1316 |
| Humanity's Last Exam | 25.2% | — |
| SimpleQA Verified | 45.7% | — |
| Confabulations | — | 18.6% |
| Vectara Hallucination Rate | 10.9% | — |
Multimodal Not comparable
Claude Opus 4.5: 31.1 (#99), o1-mini: —
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |
Multilingual Claude Opus 4.5 leads
Claude Opus 4.5: 54.5 (#45), o1-mini: 43.8 (#177)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| LMArena Non-English | 1438 | 1289 |
| LMArena Chinese | 1470 | 1314 |
| LMArena French | 1471 | 1292 |
| LMArena German | 1449 | 1278 |
| LMArena Japanese | 1415 | 1245 |
| LMArena Korean | 1424 | 1223 |
| LMArena Russian | 1448 | 1283 |
| LMArena Spanish | 1455 | 1302 |
Instruction Following Claude Opus 4.5 leads
Claude Opus 4.5: 77.7 (#20), o1-mini: 67.0 (#200)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1478 | 1304 |
| LiveBench Instruction Following | — | 65.4% |
Long Context Claude Opus 4.5 leads
Claude Opus 4.5: 46.4 (#21), o1-mini: 40.1 (#156)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| LMArena Longer Query | 1480 | 1321 |
| CL-bench | 21.1% | — |
Writing & Preference Claude Opus 4.5 leads
Claude Opus 4.5: 68.2 (#28), o1-mini: 48.6 (#196)
| Benchmark | Claude Opus 4.5 | o1-mini |
|---|---|---|
| LMArena Text | 1451 | 1317 |
| LMArena Creative Writing | 1445 | 1244 |
| LMArena Multi-Turn | 1466 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| EQ-Bench Creative Writing | 1687 | — |
| LiveBench Language | — | 40.9% |
Frequently asked questions
Is Claude Opus 4.5 better than o1-mini?
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 33.7 on the Noometry Index.
Is Claude Opus 4.5 or o1-mini better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 35.1 in the Noometry coding category.
How many benchmarks do Claude Opus 4.5 and o1-mini share?
26 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and o1-mini has 39.