Model comparison
Claude 2 vs Claude Opus 4.1
Claude Opus 4.1 is the stronger model overall, scoring 41.0 to 25.0 on the Noometry Index.
Last verified . 4 shared benchmarks.
Summary
- They share 4 benchmarks with published results for both. Claude 2 scores higher in 0 categories and Claude Opus 4.1 in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Opus 4.1 leads 42.0 to 16.9.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 2 and 68.9% for Claude Opus 4.1.
Side by side
| Claude 2 | Claude Opus 4.1 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 25.0 | 41.0 |
| Released | 2023-07-11 | 2025-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 32K |
| Input $ / M tokens | — | $15 |
| Output $ / M tokens | — | $75 |
| Results tracked | 8 | 48 |
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Category by category
Coding Not comparable
Claude 2: —, Claude Opus 4.1: 44.4 (#73)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| SWE-bench Verified | — | 73.3% |
| LMArena WebDev | — | 1390 |
| WeirdML | — | 45.9% |
| LMArena Coding | — | 1479 |
| ALE-Bench | — | 674.77 |
| AlgoTune | — | 1.34 |
| HumanEval+ | 61.6% | — |
Agentic & Tool Use Not comparable
Claude 2: —, Claude Opus 4.1: 35.0 (#41)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| Terminal-Bench | — | 38% |
| GDPval | — | 43.6% |
| Cybench | — | 42% |
| DeepResearch Bench | — | 48.3% |
| LMArena Search | — | 1148 |
| METR Time Horizons | — | 66.8% |
Reasoning Claude Opus 4.1 leads
Claude 2: 21.7 (#216), Claude Opus 4.1: 32.2 (#76)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| DTBench | 51.9% | 80% |
| Epoch Capabilities Index | 120.13 | 144.12 |
| SimpleBench | — | 60% |
| Chess Puzzles | — | 7% |
| EnigmaEval | — | 7.2% |
| EBR-Bench | — | 7.9% |
| LMArena Hard Prompts | — | 1443 |
| Mystery Game Puzzles | — | 21% |
| LMCA | — | 37.1% |
| ForecastBench | — | 62 |
Math Claude Opus 4.1 leads
Claude 2: 9.3 (#320), Claude Opus 4.1: 22.3 (#277)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 68.9% |
| FrontierMath (Tiers 1-3) | — | 12.6% |
| FrontierMath Tier 4 | — | 2.4% |
| LMArena Math | — | 1431 |
| MATH Level 5 | 11.7% | — |
| FrontierMath (Feb 2025 set) | — | 7.2% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Claude Opus 4.1 leads
Claude 2: 16.9 (#287), Claude Opus 4.1: 42.0 (#101)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| GPQA Diamond | 34.7% | 77.3% |
| Humanity's Last Exam | — | 11.5% |
| Confabulations | — | 17.1% |
| Vectara Hallucination Rate | — | 11.8% |
| LMArena Expert | — | 1439 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Multimodal Not comparable
Claude 2: —, Claude Opus 4.1: 26.8 (#119)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| VPCT | — | 35% |
Multilingual Not comparable
Claude 2: —, Claude Opus 4.1: 52.0 (#95)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| LMArena Non-English | — | 1405 |
| LMArena Chinese | — | 1427 |
| LMArena French | — | 1431 |
| LMArena German | — | 1413 |
| LMArena Japanese | — | 1378 |
| LMArena Korean | — | 1380 |
| LMArena Russian | — | 1422 |
| LMArena Spanish | — | 1448 |
Instruction Following Not comparable
Claude 2: —, Claude Opus 4.1: 75.6 (#58)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| LMArena Instruction Following | — | 1435 |
Long Context Not comparable
Claude 2: —, Claude Opus 4.1: 44.5 (#63)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| LMArena Longer Query | — | 1455 |
Writing & Preference Not comparable
Claude 2: —, Claude Opus 4.1: 62.4 (#74)
| Benchmark | Claude 2 | Claude Opus 4.1 |
|---|---|---|
| LMArena Text | — | 1419 |
| LMArena Creative Writing | — | 1412 |
| Short-Story Creative Writing | — | 84.7% |
| LMArena Multi-Turn | — | 1444 |
Frequently asked questions
Is Claude 2 better than Claude Opus 4.1?
Claude Opus 4.1 is the stronger model overall, scoring 41.0 to 25.0 on the Noometry Index.
How many benchmarks do Claude 2 and Claude Opus 4.1 share?
4 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and Claude Opus 4.1 has 48.