Model comparison
Claude Opus 4.1 vs Claude Sonnet 4
Claude Opus 4.1 and Claude Sonnet 4 score almost the same on the Noometry Index (41.0 vs 40.8), so choose on price, context window or the category you care about most.
Last verified . 37 shared benchmarks.
Summary
- They share 37 benchmarks with published results for both. Claude Opus 4.1 scores higher in 8 categories and Claude Sonnet 4 in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 4 leads 43.3 to 22.3.
- The biggest single-benchmark swing is SimpleBench: 60% for Claude Opus 4.1 and 45.5% for Claude Sonnet 4.
- Claude Sonnet 4 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 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 41.0 | 40.8 |
| Released | 2025-08-05 | 2025-05-22 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 200K |
| Max output | 32K | 64K |
| Input $ / M tokens | $15 | $3 |
| Output $ / M tokens | $75 | $15 |
| Results tracked | 48 | 58 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Too close to call
Claude Opus 4.1: 44.4 (#73), Claude Sonnet 4: 43.5 (#88)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| WeirdML | 45.9% | 46.1% |
| LMArena Coding | 1479 | 1414 |
| ALE-Bench | 674.77 | 655.35 |
| SWE-bench Verified | 73.3% | — |
| SWE-bench Verified (bash only) | — | 64.9% |
| Aider Polyglot | — | 61.3% |
| LMArena WebDev | 1390 | — |
| SciCode | — | 40% |
| GSO | — | 4.9% |
| AlgoTune | 1.34 | — |
Agentic & Tool Use Claude Sonnet 4 leads
Claude Opus 4.1: 35.0 (#41), Claude Sonnet 4: 38.5 (#31)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| Cybench | 42% | 35% |
| DeepResearch Bench | 48.3% | 46.6% |
| METR Time Horizons | 66.8% | 62% |
| Terminal-Bench | 38% | — |
| GDPval | 43.6% | — |
| TheAgentCompany | — | 33.1% |
| OSWorld | — | 43.9% |
| LMArena Search | 1148 | — |
Reasoning Claude Opus 4.1 leads
Claude Opus 4.1: 32.2 (#76), Claude Sonnet 4: 22.9 (#187)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| SimpleBench | 60% | 45.5% |
| EnigmaEval | 7.2% | 3.1% |
| LMArena Hard Prompts | 1443 | 1372 |
| DTBench | 80% | 77.1% |
| LMCA | 37.1% | 29% |
| Epoch Capabilities Index | 144.12 | 141.69 |
| ForecastBench | 62 | 60.2 |
| ARC-AGI-2 | — | 5.9% |
| Kagi LLM Benchmark | — | 73% |
| ARC-AGI-1 | — | 40% |
| CritPt | — | 0.3% |
| Chess Puzzles | 7% | — |
| EBR-Bench | 7.9% | — |
| Mystery Game Puzzles | 21% | — |
Math Claude Sonnet 4 leads
Claude Opus 4.1: 22.3 (#277), Claude Sonnet 4: 43.3 (#80)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.9% | 71.1% |
| LMArena Math | 1431 | 1375 |
| FrontierMath (Feb 2025 set) | 7.2% | 4.1% |
| FrontierMath Tier 4 (v1) | 4.2% | 0% |
| FrontierMath (Tiers 1-3) | 12.6% | — |
| FrontierMath Tier 4 | 2.4% | — |
| Omni-MATH | — | 60.2% |
| MATH Level 5 | — | 84.4% |
Knowledge Too close to call
Claude Opus 4.1: 42.0 (#101), Claude Sonnet 4: 41.8 (#108)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| GPQA Diamond | 77.3% | 79.2% |
| Humanity's Last Exam | 11.5% | 7.8% |
| Confabulations | 17.1% | 13.2% |
| Vectara Hallucination Rate | 11.8% | 10.3% |
| LMArena Expert | 1439 | 1372 |
| MMLU-Pro | — | 84.3% |
| GPQA (HELM) | — | 70.6% |
Multimodal Too close to call
Claude Opus 4.1: 26.8 (#119), Claude Sonnet 4: 26.2 (#121)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| VPCT | 35% | 34% |
| LMArena Vision | — | 1191 |
| GeoBench | — | 37% |
| MindCube | — | 44.8% |
Multilingual Claude Opus 4.1 leads
Claude Opus 4.1: 52.0 (#95), Claude Sonnet 4: 46.7 (#156)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| LMArena Non-English | 1405 | 1333 |
| LMArena Chinese | 1427 | 1350 |
| LMArena French | 1431 | 1363 |
| LMArena German | 1413 | 1331 |
| LMArena Japanese | 1378 | 1302 |
| LMArena Korean | 1380 | 1291 |
| LMArena Russian | 1422 | 1355 |
| LMArena Spanish | 1448 | 1357 |
Instruction Following Claude Opus 4.1 leads
Claude Opus 4.1: 75.6 (#58), Claude Sonnet 4: 71.7 (#145)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| LMArena Instruction Following | 1435 | 1376 |
| IFEval | — | 84% |
Long Context Claude Opus 4.1 leads
Claude Opus 4.1: 44.5 (#63), Claude Sonnet 4: 33.7 (#259)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| LMArena Longer Query | 1455 | 1398 |
| Fiction.LiveBench | — | 46.9% |
Writing & Preference Claude Opus 4.1 leads
Claude Opus 4.1: 62.4 (#74), Claude Sonnet 4: 57.1 (#132)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 4 |
|---|---|---|
| LMArena Text | 1419 | 1351 |
| LMArena Creative Writing | 1412 | 1345 |
| Short-Story Creative Writing | 84.7% | 81.4% |
| LMArena Multi-Turn | 1444 | 1376 |
| EQ-Bench Creative Writing | — | 1483 |
| WildBench | — | 83.8% |
Frequently asked questions
Is Claude Opus 4.1 better than Claude Sonnet 4?
Claude Opus 4.1 and Claude Sonnet 4 score almost the same on the Noometry Index (41.0 vs 40.8), so choose on price, context window or the category you care about most.
Which is cheaper, Claude Opus 4.1 or Claude Sonnet 4?
Claude Sonnet 4 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 better for coding?
They score almost the same on coding (44.4 vs 43.5); test both on your own repository before choosing.
Which has the bigger context window?
Both accept 200K tokens.
How many benchmarks do Claude Opus 4.1 and Claude Sonnet 4 share?
37 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Claude Sonnet 4 has 58.