Model comparison
Claude Opus 4.1 vs Claude Sonnet 4.5
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 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 2 categories and Claude Sonnet 4.5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 4.5 leads 32.3 to 22.3.
- The biggest single-benchmark swing is Cybench: 42% for Claude Opus 4.1 and 60% for Claude Sonnet 4.5.
- Claude Sonnet 4.5 is cheaper at $3 / $15 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
Side by side
| Claude Opus 4.1 | Claude Sonnet 4.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 41.0 | 44.1 |
| Released | 2025-08-05 | 2025-09-29 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 200K |
| Max output | 32K | 64K |
| Input $ / M tokens | $15 | $3 |
| Output $ / M tokens | $75 | $15 |
| Results tracked | 48 | 73 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Opus 4.1: 44.4 (#73), Claude Sonnet 4.5: 47.3 (#61)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| SWE-bench Verified | 73.3% | 71.3% |
| LMArena WebDev | 1390 | 1393 |
| WeirdML | 45.9% | 47.7% |
| LMArena Coding | 1479 | 1489 |
| ALE-Bench | 674.77 | 796.15 |
| AlgoTune | 1.34 | 1.52 |
| SWE-bench Verified (bash only) | — | 71.4% |
| SWE-bench Multilingual | — | 67% |
| SciCode | — | 44.7% |
| GSO | — | 14.7% |
Agentic & Tool Use Claude Sonnet 4.5 leads
Claude Opus 4.1: 35.0 (#41), Claude Sonnet 4.5: 38.3 (#32)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| Terminal-Bench | 38% | 46.5% |
| GDPval | 43.6% | 42.5% |
| Cybench | 42% | 60% |
| DeepResearch Bench | 48.3% | 52.6% |
| LMArena Search | 1148 | 1159 |
| METR Time Horizons | 66.8% | 67.4% |
| Berkeley Function Calling Leaderboard | — | 73.2% |
| Remote Labor Index | — | 2.1% |
| τ²-bench Airline | — | 72% |
| τ²-bench Banking | — | 25.3% |
| τ²-bench Retail | — | 72.4% |
| τ²-bench Telecom | — | 84.9% |
| OSWorld | — | 62.9% |
| Vending-Bench 2 | — | 3,839 |
Reasoning Claude Opus 4.1 leads
Claude Opus 4.1: 32.2 (#76), Claude Sonnet 4.5: 26.9 (#125)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| SimpleBench | 60% | 54.3% |
| Chess Puzzles | 7% | 12% |
| EnigmaEval | 7.2% | 6% |
| EBR-Bench | 7.9% | 2.4% |
| LMArena Hard Prompts | 1443 | 1462 |
| Mystery Game Puzzles | 21% | 17% |
| DTBench | 80% | 83.2% |
| LMCA | 37.1% | 38.8% |
| Epoch Capabilities Index | 144.12 | 146.84 |
| ForecastBench | 62 | 61.9 |
| ARC-AGI-2 | — | 13.6% |
| Kagi LLM Benchmark | — | 57.9% |
| NYT Connections (extended) | — | 37.3% |
| ARC-AGI-1 | — | 63.7% |
| CritPt | — | 1.1% |
Math Claude Sonnet 4.5 leads
Claude Opus 4.1: 22.3 (#277), Claude Sonnet 4.5: 32.3 (#216)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 12.6% | 23.9% |
| FrontierMath Tier 4 | 2.4% | 2.4% |
| OTIS Mock AIME 2024-2025 | 68.9% | 77.8% |
| LMArena Math | 1431 | 1449 |
| FrontierMath (Feb 2025 set) | 7.2% | 15.2% |
| FrontierMath Tier 4 (v1) | 4.2% | 4.2% |
| ProofBench | — | 19% |
| Omni-MATH | — | 55.3% |
| MATH Level 5 | — | 97.7% |
Knowledge Claude Sonnet 4.5 leads
Claude Opus 4.1: 42.0 (#101), Claude Sonnet 4.5: 48.4 (#76)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| GPQA Diamond | 77.3% | 82.3% |
| Humanity's Last Exam | 11.5% | 13.7% |
| Vectara Hallucination Rate | 11.8% | 12% |
| LMArena Expert | 1439 | 1482 |
| SimpleQA Verified | — | 30.7% |
| MMLU-Pro | — | 86.9% |
| Confabulations | 17.1% | — |
| GPQA (HELM) | — | 68.6% |
Multimodal Claude Sonnet 4.5 leads
Claude Opus 4.1: 26.8 (#119), Claude Sonnet 4.5: 34.8 (#89)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| VPCT | 35% | 39.8% |
| LMArena Document | — | 1450 |
Multilingual Claude Sonnet 4.5 leads
Claude Opus 4.1: 52.0 (#95), Claude Sonnet 4.5: 53.4 (#69)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Non-English | 1405 | 1425 |
| LMArena Chinese | 1427 | 1459 |
| LMArena French | 1431 | 1458 |
| LMArena German | 1413 | 1427 |
| LMArena Japanese | 1378 | 1390 |
| LMArena Korean | 1380 | 1403 |
| LMArena Russian | 1422 | 1437 |
| LMArena Spanish | 1448 | 1457 |
Instruction Following Too close to call
Claude Opus 4.1: 75.6 (#58), Claude Sonnet 4.5: 75.0 (#78)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Instruction Following | 1435 | 1459 |
| IFEval | — | 85% |
Long Context Too close to call
Claude Opus 4.1: 44.5 (#63), Claude Sonnet 4.5: 45.2 (#46)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Longer Query | 1455 | 1476 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Opus 4.1: 62.4 (#74), Claude Sonnet 4.5: 66.5 (#34)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Text | 1419 | 1439 |
| LMArena Creative Writing | 1412 | 1442 |
| LMArena Multi-Turn | 1444 | 1465 |
| Short-Story Creative Writing | 84.7% | — |
| EQ-Bench Creative Writing | — | 1678 |
| WildBench | — | 85.4% |
Frequently asked questions
Is Claude Opus 4.1 better than Claude Sonnet 4.5?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.1 to 41.0 on the Noometry Index.
Which is cheaper, Claude Opus 4.1 or Claude Sonnet 4.5?
Claude Sonnet 4.5 is cheaper. It lists at $3 per million input tokens and $15 per million output tokens; Claude Opus 4.1 lists at $15 and $75.
Is Claude Opus 4.1 or Claude Sonnet 4.5 better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 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 Sonnet 4.5 share?
46 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Claude Sonnet 4.5 has 73.