Model comparison
Claude Opus 4 vs Claude Opus 4.1
Claude Opus 4 is the stronger model overall, scoring 43.1 to 41.0 on the Noometry Index.
Last verified . 39 shared benchmarks.
Summary
- They share 39 benchmarks with published results for both. Claude Opus 4 scores higher in 5 categories and Claude Opus 4.1 in 5 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4 leads 42.0 to 22.3.
- Both cost about the same: $15 input and $75 output per million tokens.
Side by side
| Claude Opus 4 | Claude Opus 4.1 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 43.1 | 41.0 |
| Released | 2025-05-22 | 2025-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 200K |
| Max output | 32K | 32K |
| Input $ / M tokens | $15 | $15 |
| Output $ / M tokens | $75 | $75 |
| Results tracked | 56 | 48 |
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Category by category
Coding Claude Opus 4 leads
Claude Opus 4: 47.2 (#62), Claude Opus 4.1: 44.4 (#73)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| SWE-bench Verified | 70.7% | 73.3% |
| WeirdML | 43.7% | 45.9% |
| LMArena Coding | 1442 | 1479 |
| AlgoTune | 1.33 | 1.34 |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| LMArena WebDev | — | 1390 |
| GSO | 6.9% | — |
| ALE-Bench | — | 674.77 |
Agentic & Tool Use Too close to call
Claude Opus 4: 34.8 (#42), Claude Opus 4.1: 35.0 (#41)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| Cybench | 38% | 42% |
| DeepResearch Bench | 46.8% | 48.3% |
| LMArena Search | 1127 | 1148 |
| METR Time Horizons | 63.9% | 66.8% |
| Terminal-Bench | — | 38% |
| GDPval | — | 43.6% |
Reasoning Claude Opus 4.1 leads
Claude Opus 4: 27.3 (#121), Claude Opus 4.1: 32.2 (#76)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| SimpleBench | 58.8% | 60% |
| EnigmaEval | 5.6% | 7.2% |
| LMArena Hard Prompts | 1399 | 1443 |
| DTBench | 81.6% | 80% |
| LMCA | 37.4% | 37.1% |
| Epoch Capabilities Index | 142.67 | 144.12 |
| ForecastBench | 61.1 | 62 |
| ARC-AGI-2 | 8.6% | — |
| Kagi LLM Benchmark | 74.3% | — |
| ARC-AGI-1 | 35.7% | — |
| CritPt | 0.3% | — |
| Chess Puzzles | — | 7% |
| EBR-Bench | — | 7.9% |
| Mystery Game Puzzles | — | 21% |
Math Claude Opus 4 leads
Claude Opus 4: 42.0 (#86), Claude Opus 4.1: 22.3 (#277)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 64.4% | 68.9% |
| LMArena Math | 1390 | 1431 |
| FrontierMath (Feb 2025 set) | 4.5% | 7.2% |
| FrontierMath Tier 4 (v1) | 4.2% | 4.2% |
| FrontierMath (Tiers 1-3) | — | 12.6% |
| FrontierMath Tier 4 | — | 2.4% |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
Knowledge Claude Opus 4 leads
Claude Opus 4: 44.0 (#88), Claude Opus 4.1: 42.0 (#101)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| GPQA Diamond | 76.3% | 77.3% |
| Humanity's Last Exam | 10.7% | 11.5% |
| Confabulations | 15.9% | 17.1% |
| Vectara Hallucination Rate | 12% | 11.8% |
| LMArena Expert | 1386 | 1439 |
| MMLU-Pro | 87.5% | — |
| GPQA (HELM) | 70.8% | — |
Multimodal Claude Opus 4 leads
Claude Opus 4: 31.5 (#106), Claude Opus 4.1: 26.8 (#119)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| VPCT | 38% | 35% |
| LMArena Vision | 1192 | — |
| GeoBench | 49% | — |
Multilingual Claude Opus 4.1 leads
Claude Opus 4: 48.8 (#138), Claude Opus 4.1: 52.0 (#95)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| LMArena Non-English | 1362 | 1405 |
| LMArena Chinese | 1386 | 1427 |
| LMArena French | 1372 | 1431 |
| LMArena German | 1391 | 1413 |
| LMArena Japanese | 1331 | 1378 |
| LMArena Korean | 1321 | 1380 |
| LMArena Russian | 1392 | 1422 |
| LMArena Spanish | 1389 | 1448 |
Instruction Following Claude Opus 4 leads
Claude Opus 4: 77.1 (#28), Claude Opus 4.1: 75.6 (#58)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1435 |
| IFEval | 91.8% | — |
Long Context Claude Opus 4.1 leads
Claude Opus 4: 39.6 (#172), Claude Opus 4.1: 44.5 (#63)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| LMArena Longer Query | 1422 | 1455 |
| Fiction.LiveBench | 61.1% | — |
Writing & Preference Claude Opus 4.1 leads
Claude Opus 4: 61.2 (#89), Claude Opus 4.1: 62.4 (#74)
| Benchmark | Claude Opus 4 | Claude Opus 4.1 |
|---|---|---|
| LMArena Text | 1377 | 1419 |
| LMArena Creative Writing | 1387 | 1412 |
| Short-Story Creative Writing | 83.6% | 84.7% |
| LMArena Multi-Turn | 1396 | 1444 |
| EQ-Bench Creative Writing | 1580 | — |
| WildBench | 85.2% | — |
Frequently asked questions
Is Claude Opus 4 better than Claude Opus 4.1?
Claude Opus 4 is the stronger model overall, scoring 43.1 to 41.0 on the Noometry Index.
Which is cheaper, Claude Opus 4 or Claude Opus 4.1?
Claude Opus 4.1 is cheaper. It lists at $15 per million input tokens and $75 per million output tokens; Claude Opus 4 lists at $15 and $75.
Is Claude Opus 4 or Claude Opus 4.1 better for coding?
Claude Opus 4 scores higher on coding benchmarks: 47.2 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 and Claude Opus 4.1 share?
39 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Claude Opus 4.1 has 48.