Model comparison
Claude Opus 4.1 vs Claude Opus 4.5
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.0 on the Noometry Index.
Last verified . 46 shared benchmarks.
Summary
- They share 46 benchmarks with published results for both. Claude Opus 4.1 scores higher in 0 categories and Claude Opus 4.5 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.5 leads 38.6 to 22.3.
- The biggest single-benchmark swing is Cybench: 42% for Claude Opus 4.1 and 82% for Claude Opus 4.5.
- Claude Opus 4.5 is cheaper at $5 / $25 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
Side by side
| Claude Opus 4.1 | Claude Opus 4.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 41.0 | 50.5 |
| Released | 2025-08-05 | 2025-11-01 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 200K |
| Max output | 32K | 64K |
| Input $ / M tokens | $15 | $5 |
| Output $ / M tokens | $75 | $25 |
| Results tracked | 48 | 69 |
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Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.1: 44.4 (#73), Claude Opus 4.5: 54.8 (#27)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| SWE-bench Verified | 73.3% | 76.7% |
| LMArena WebDev | 1390 | 1494 |
| WeirdML | 45.9% | 63.7% |
| LMArena Coding | 1479 | 1504 |
| ALE-Bench | 674.77 | 1,025 |
| AlgoTune | 1.34 | 1.77 |
| SWE-bench Verified (bash only) | — | 76.8% |
| SWE-bench Multilingual | — | 70.7% |
| GSO | — | 26.5% |
Agentic & Tool Use Claude Opus 4.5 leads
Claude Opus 4.1: 35.0 (#41), Claude Opus 4.5: 47.3 (#12)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| Terminal-Bench | 38% | 63.1% |
| GDPval | 43.6% | 45.5% |
| Cybench | 42% | 82% |
| DeepResearch Bench | 48.3% | 54.8% |
| LMArena Search | 1148 | 1180 |
| METR Time Horizons | 66.8% | 75% |
| Berkeley Function Calling Leaderboard | — | 77.5% |
| Remote Labor Index | — | 3.8% |
| τ²-bench Airline | — | 84% |
| τ²-bench Banking | — | 24.7% |
| τ²-bench Retail | — | 79.6% |
| τ²-bench Telecom | — | 92.3% |
| OSWorld | — | 66.3% |
| BALROG | — | 43.5% |
| Vending-Bench 2 | — | 4,967 |
Reasoning Claude Opus 4.5 leads
Claude Opus 4.1: 32.2 (#76), Claude Opus 4.5: 42.6 (#51)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| SimpleBench | 60% | 62% |
| Chess Puzzles | 7% | 12% |
| EnigmaEval | 7.2% | 11.9% |
| EBR-Bench | 7.9% | 14.3% |
| LMArena Hard Prompts | 1443 | 1476 |
| Mystery Game Puzzles | 21% | 22% |
| DTBench | 80% | 89.9% |
| LMCA | 37.1% | 44.5% |
| Epoch Capabilities Index | 144.12 | 150.09 |
| ForecastBench | 62 | 60.7 |
| ARC-AGI-2 | — | 37.6% |
| Kagi LLM Benchmark | — | 80.2% |
| NYT Connections (extended) | — | 52.5% |
| ARC-AGI-1 | — | 80% |
Math Claude Opus 4.5 leads
Claude Opus 4.1: 22.3 (#277), Claude Opus 4.5: 38.6 (#132)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 12.6% | 34.4% |
| FrontierMath Tier 4 | 2.4% | 4.9% |
| OTIS Mock AIME 2024-2025 | 68.9% | 86.1% |
| LMArena Math | 1431 | 1463 |
| FrontierMath (Feb 2025 set) | 7.2% | 20.7% |
| FrontierMath Tier 4 (v1) | 4.2% | 4.2% |
| ProofBench | — | 36% |
Knowledge Claude Opus 4.5 leads
Claude Opus 4.1: 42.0 (#101), Claude Opus 4.5: 56.5 (#44)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| GPQA Diamond | 77.3% | 86% |
| Humanity's Last Exam | 11.5% | 25.2% |
| Vectara Hallucination Rate | 11.8% | 10.9% |
| LMArena Expert | 1439 | 1487 |
| SimpleQA Verified | — | 45.7% |
| Confabulations | 17.1% | — |
Multimodal Claude Opus 4.5 leads
Claude Opus 4.1: 26.8 (#119), Claude Opus 4.5: 31.4 (#107)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| VPCT | 35% | 40% |
| GeoBench | — | 75% |
| Furniture Assembly | — | 28.3% |
| LMArena Document | — | 1462 |
Multilingual Claude Opus 4.5 leads
Claude Opus 4.1: 52.0 (#95), Claude Opus 4.5: 54.3 (#47)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| LMArena Non-English | 1405 | 1438 |
| LMArena Chinese | 1427 | 1470 |
| LMArena French | 1431 | 1471 |
| LMArena German | 1413 | 1449 |
| LMArena Japanese | 1378 | 1416 |
| LMArena Korean | 1380 | 1424 |
| LMArena Russian | 1422 | 1447 |
| LMArena Spanish | 1448 | 1458 |
Instruction Following Claude Opus 4.5 leads
Claude Opus 4.1: 75.6 (#58), Claude Opus 4.5: 77.5 (#19)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| LMArena Instruction Following | 1435 | 1478 |
Long Context Claude Opus 4.5 leads
Claude Opus 4.1: 44.5 (#63), Claude Opus 4.5: 46.5 (#22)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| LMArena Longer Query | 1455 | 1480 |
| CL-bench | — | 21.1% |
Writing & Preference Claude Opus 4.5 leads
Claude Opus 4.1: 62.4 (#74), Claude Opus 4.5: 68.1 (#28)
| Benchmark | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| LMArena Text | 1419 | 1451 |
| LMArena Creative Writing | 1412 | 1445 |
| LMArena Multi-Turn | 1444 | 1466 |
| Short-Story Creative Writing | 84.7% | — |
| EQ-Bench Creative Writing | — | 1687 |
Frequently asked questions
Is Claude Opus 4.1 better than Claude Opus 4.5?
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.0 on the Noometry Index.
Which is cheaper, Claude Opus 4.1 or Claude Opus 4.5?
Claude Opus 4.5 is cheaper. It lists at $5 per million input tokens and $25 per million output tokens; Claude Opus 4.1 lists at $15 and $75.
Is Claude Opus 4.1 or Claude Opus 4.5 better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 44.4 in the Noometry coding category.
Which has the bigger context window?
Both accept 200K tokens.
How many benchmarks do Claude Opus 4.1 and Claude Opus 4.5 share?
46 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Claude Opus 4.5 has 69.