Model comparison
Claude Opus 4.1 vs Claude Sonnet 5
Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 40.8 on the Noometry Index.
Last verified . 32 shared benchmarks.
Summary
- They share 32 benchmarks with published results for both. Claude Opus 4.1 scores higher in 0 categories and Claude Sonnet 5 in 10 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5 leads 66.1 to 22.0.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 12.6% for Claude Opus 4.1 and 65.6% for Claude Sonnet 5.
- Claude Sonnet 5 is cheaper at $2 / $10 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
- Claude Sonnet 5 accepts more context: 1M tokens versus 200K.
Side by side
| Claude Opus 4.1 | Claude Sonnet 5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 40.8 | 54.5 |
| Released | 2025-08-05 | 2026-06-29 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 1M |
| Max output | 32K | 128K |
| Input $ / M tokens | $15 | $2 |
| Output $ / M tokens | $75 | $10 |
| Results tracked | 48 | 51 |
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Category by category
Coding Claude Sonnet 5 leads
Claude Opus 4.1: 44.3 (#69), Claude Sonnet 5: 55.5 (#20)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena WebDev | 1390 | 1540 |
| WeirdML | 45.9% | 68.8% |
| LMArena Coding | 1479 | 1483 |
| ALE-Bench | 674.77 | 1,463 |
| SWE-bench Verified | 73.3% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.7% |
| CursorBench | — | 34.1% |
| SciCode | — | 53.6% |
| GSO | — | 37.3% |
| AlgoTune | 1.34 | — |
Agentic & Tool Use Claude Sonnet 5 leads
Claude Opus 4.1: 34.8 (#38), Claude Sonnet 5: 42.7 (#16)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena Search | 1148 | 1194 |
| Terminal-Bench | 38% | — |
| APEX-Agents | — | 54.5% |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| GBAEval | — | 65.3% |
| METR Time Horizons | 66.8% | — |
| Vending-Bench 2 | — | 6,378 |
Reasoning Claude Sonnet 5 leads
Claude Opus 4.1: 31.6 (#70), Claude Sonnet 5: 48.2 (#37)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| SimpleBench | 60% | 60.6% |
| Chess Puzzles | 7% | 35% |
| LMArena Hard Prompts | 1443 | 1461 |
| Mystery Game Puzzles | 21% | 35% |
| DTBench | 80% | 92.5% |
| LMCA | 37.1% | 50% |
| Epoch Capabilities Index | 144.11 | 156.34 |
| ForecastBench | 62 | 61.1 |
| NYT Connections (extended) | — | 75.1% |
| CritPt | — | 16.9% |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| Surface Evolver Bench | — | 60% |
| Bench to the Future 3 | — | 0.14 |
Math Claude Sonnet 5 leads
Claude Opus 4.1: 22.0 (#267), Claude Sonnet 5: 66.1 (#21)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 12.6% | 65.6% |
| FrontierMath Tier 4 | 2.4% | 29.3% |
| OTIS Mock AIME 2024-2025 | 68.9% | 94.7% |
| LMArena Math | 1430 | 1467 |
| ProofBench | — | 77% |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 5 leads
Claude Opus 4.1: 41.9 (#93), Claude Sonnet 5: 55.7 (#42)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| GPQA Diamond | 77.3% | 90.5% |
| LMArena Expert | 1439 | 1491 |
| Humanity's Last Exam | 11.5% | — |
| SimpleQA Verified | — | 33.7% |
| Confabulations | 17.1% | — |
| Vectara Hallucination Rate | 11.8% | — |
Multimodal Claude Sonnet 5 leads
Claude Opus 4.1: 26.2 (#114), Claude Sonnet 5: 42.4 (#26)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena Vision | — | 1275 |
| VPCT | 35% | — |
| Blueprint-Bench 2 | — | 24.9% |
| LMArena Document | — | 1466 |
Multilingual Claude Sonnet 5 leads
Claude Opus 4.1: 52.1 (#90), Claude Sonnet 5: 54.0 (#55)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena Non-English | 1405 | 1431 |
| LMArena Chinese | 1427 | 1475 |
| LMArena French | 1432 | 1457 |
| LMArena German | 1412 | 1448 |
| LMArena Japanese | 1378 | 1422 |
| LMArena Korean | 1381 | 1411 |
| LMArena Russian | 1421 | 1452 |
| LMArena Spanish | 1448 | 1436 |
Instruction Following Too close to call
Claude Opus 4.1: 75.8 (#53), Claude Sonnet 5: 76.6 (#39)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena Instruction Following | 1436 | 1453 |
Long Context Too close to call
Claude Opus 4.1: 44.5 (#60), Claude Sonnet 5: 44.8 (#53)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena Longer Query | 1455 | 1464 |
Writing & Preference Claude Sonnet 5 leads
Claude Opus 4.1: 62.6 (#70), Claude Sonnet 5: 69.4 (#24)
| Benchmark | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|
| LMArena Text | 1419 | 1443 |
| LMArena Creative Writing | 1412 | 1416 |
| LMArena Multi-Turn | 1444 | 1454 |
| Short-Story Creative Writing | 84.7% | — |
| EQ-Bench Creative Writing | — | 1794 |
| EQ-Bench 4 | — | 1236 |
Frequently asked questions
Is Claude Opus 4.1 better than Claude Sonnet 5?
Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 40.8 on the Noometry Index.
Which is cheaper, Claude Opus 4.1 or Claude Sonnet 5?
Claude Sonnet 5 is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; Claude Opus 4.1 lists at $15 and $75.
Is Claude Opus 4.1 or Claude Sonnet 5 better for coding?
Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 44.3 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 5 does, with 1M tokens against 200K.
How many benchmarks do Claude Opus 4.1 and Claude Sonnet 5 share?
32 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Claude Sonnet 5 has 51.