Model comparison
Claude 3.5 Sonnet vs Claude Opus 4.1
Claude Opus 4.1 is the stronger model overall, scoring 40.8 to 34.4 on the Noometry Index.
Last verified . 33 shared benchmarks.
Summary
- They share 33 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 0 categories and Claude Opus 4.1 in 10 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Opus 4.1 leads 41.9 to 28.5.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 8.5% for Claude 3.5 Sonnet and 68.9% for Claude Opus 4.1.
Side by side
| Claude 3.5 Sonnet | Claude Opus 4.1 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 34.4 | 40.8 |
| Released | 2024-06-20 | 2025-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 32K |
| Input $ / M tokens | — | $15 |
| Output $ / M tokens | — | $75 |
| Results tracked | 60 | 48 |
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Category by category
Coding Claude Opus 4.1 leads
Claude 3.5 Sonnet: 39.5 (#145), Claude Opus 4.1: 44.3 (#69)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| WeirdML | 40% | 45.9% |
| LMArena Coding | 1343 | 1479 |
| SWE-bench Verified | — | 73.3% |
| Aider Polyglot | 51.6% | — |
| LMArena WebDev | — | 1390 |
| GSO | 4.6% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 674.77 |
| AlgoTune | — | 1.34 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Claude Opus 4.1 leads
Claude 3.5 Sonnet: 32.1 (#61), Claude Opus 4.1: 34.8 (#38)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| Cybench | 17.5% | 42% |
| METR Time Horizons | 45.2% | 66.8% |
| Terminal-Bench | — | 38% |
| GDPval | — | 43.6% |
| TheAgentCompany | 24% | — |
| DeepResearch Bench | — | 48.3% |
| BALROG | 32.6% | — |
| LMArena Search | — | 1148 |
Reasoning Claude Opus 4.1 leads
Claude 3.5 Sonnet: 22.5 (#176), Claude Opus 4.1: 31.6 (#70)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| SimpleBench | 41.4% | 60% |
| EnigmaEval | 0.9% | 7.2% |
| LMArena Hard Prompts | 1305 | 1443 |
| DTBench | 67.8% | 80% |
| Epoch Capabilities Index | 133.55 | 144.11 |
| ForecastBench | 60.7 | 62 |
| Chess Puzzles | — | 7% |
| EBR-Bench | — | 7.9% |
| LiveBench Reasoning | 56.7% | — |
| Mystery Game Puzzles | — | 21% |
| LiveBench Data Analysis | 55% | — |
| LMCA | — | 37.1% |
| LiveBench | 59% | — |
Math Claude Opus 4.1 leads
Claude 3.5 Sonnet: 18.0 (#282), Claude Opus 4.1: 22.0 (#267)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 68.9% |
| LMArena Math | 1306 | 1430 |
| FrontierMath (Feb 2025 set) | 2.1% | 7.2% |
| FrontierMath Tier 4 (v1) | 0% | 4.2% |
| FrontierMath (Tiers 1-3) | — | 12.6% |
| FrontierMath Tier 4 | — | 2.4% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
Knowledge Claude Opus 4.1 leads
Claude 3.5 Sonnet: 28.5 (#236), Claude Opus 4.1: 41.9 (#93)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| GPQA Diamond | 55.3% | 77.3% |
| Humanity's Last Exam | 4.1% | 11.5% |
| Confabulations | 19.9% | 17.1% |
| LMArena Expert | 1264 | 1439 |
| MMLU-Pro | 77.7% | — |
| Vectara Hallucination Rate | — | 11.8% |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |
Multimodal Too close to call
Claude 3.5 Sonnet: 26.0 (#115), Claude Opus 4.1: 26.2 (#114)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| VPCT | 33% | 35% |
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
Multilingual Claude Opus 4.1 leads
Claude 3.5 Sonnet: 43.4 (#180), Claude Opus 4.1: 52.1 (#90)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| LMArena Non-English | 1283 | 1405 |
| LMArena Chinese | 1271 | 1427 |
| LMArena French | 1304 | 1432 |
| LMArena German | 1297 | 1412 |
| LMArena Japanese | 1234 | 1378 |
| LMArena Korean | 1200 | 1381 |
| LMArena Russian | 1305 | 1421 |
| LMArena Spanish | 1289 | 1448 |
Instruction Following Claude Opus 4.1 leads
Claude 3.5 Sonnet: 69.0 (#177), Claude Opus 4.1: 75.8 (#53)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| LMArena Instruction Following | 1297 | 1436 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
Long Context Claude Opus 4.1 leads
Claude 3.5 Sonnet: 39.9 (#162), Claude Opus 4.1: 44.5 (#60)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| LMArena Longer Query | 1311 | 1455 |
Writing & Preference Claude Opus 4.1 leads
Claude 3.5 Sonnet: 53.0 (#159), Claude Opus 4.1: 62.6 (#70)
| Benchmark | Claude 3.5 Sonnet | Claude Opus 4.1 |
|---|---|---|
| LMArena Text | 1298 | 1419 |
| LMArena Creative Writing | 1292 | 1412 |
| Short-Story Creative Writing | 80.3% | 84.7% |
| LMArena Multi-Turn | 1326 | 1444 |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than Claude Opus 4.1?
Claude Opus 4.1 is the stronger model overall, scoring 40.8 to 34.4 on the Noometry Index.
Is Claude 3.5 Sonnet or Claude Opus 4.1 better for coding?
Claude Opus 4.1 scores higher on coding benchmarks: 44.3 versus 39.5 in the Noometry coding category.
How many benchmarks do Claude 3.5 Sonnet and Claude Opus 4.1 share?
33 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Claude Opus 4.1 has 48.