Model comparison
Claude 2 vs o3
o3 is the stronger model overall, scoring 47.4 to 24.7 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. Claude 2 scores higher in 0 categories and o3 in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where o3 leads 48.9 to 8.7.
- The biggest single-benchmark swing is MATH Level 5: 11.7% for Claude 2 and 97.8% for o3.
Side by side
| Claude 2 | o3 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 24.7 | 47.4 |
| Released | 2023-07-11 | 2025-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 100K |
| Input $ / M tokens | — | $2 |
| Output $ / M tokens | — | $8 |
| Results tracked | 8 | 63 |
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Category by category
Coding Not comparable
Claude 2: —, o3: 47.3 (#57)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| SWE-bench Verified | — | 62.3% |
| SWE-bench Verified (bash only) | — | 58.4% |
| Aider Polyglot | — | 81.3% |
| GSO | — | 8.8% |
| WeirdML | — | 52.4% |
| LMArena Coding | — | 1408 |
| CadEval | — | 74% |
| ALE-Bench | — | 933.55 |
| HumanEval+ | 61.6% | — |
Agentic & Tool Use Not comparable
Claude 2: —, o3: 34.3 (#42)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 30.8% |
| DeepResearch Bench | — | 45.2% |
| OSWorld | — | 23% |
| LMArena Search | — | 1144 |
| METR Time Horizons | — | 65.4% |
Reasoning o3 leads
Claude 2: 20.8 (#213), o3: 32.1 (#66)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| DTBench | 51.9% | 84.8% |
| Epoch Capabilities Index | 120.08 | 146.88 |
| ARC-AGI-2 | — | 6.5% |
| SimpleBench | — | 53.1% |
| Kagi LLM Benchmark | — | 67.6% |
| ARC-AGI-1 | — | 60.8% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 38% |
| EnigmaEval | — | 13.1% |
| LMArena Hard Prompts | — | 1402 |
| Mystery Game Puzzles | — | 29% |
| LMCA | — | 39.7% |
| ForecastBench | — | 62.5 |
Math o3 leads
Claude 2: 8.7 (#314), o3: 48.9 (#49)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 84.4% |
| MATH Level 5 | 11.7% | 97.8% |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| Omni-MATH | — | 71.4% |
| LMArena Math | — | 1426 |
| FrontierMath (Feb 2025 set) | — | 18.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge o3 leads
Claude 2: 17.0 (#282), o3: 54.5 (#47)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| GPQA Diamond | 34.7% | 81.8% |
| Humanity's Last Exam | — | 20.3% |
| SimpleQA Verified | — | 49.4% |
| MMLU-Pro | — | 85.9% |
| Confabulations | — | 14.4% |
| GPQA (HELM) | — | 75.3% |
| LMArena Expert | — | 1403 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Multimodal Not comparable
Claude 2: —, o3: 40.7 (#35)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| LMArena Vision | — | 1214 |
| GeoBench | — | 74% |
| VPCT | — | 52% |
Multilingual Not comparable
Claude 2: —, o3: 51.9 (#99)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| LMArena Non-English | — | 1402 |
| LMArena Chinese | — | 1438 |
| LMArena French | — | 1430 |
| LMArena German | — | 1420 |
| LMArena Japanese | — | 1404 |
| LMArena Korean | — | 1371 |
| LMArena Russian | — | 1407 |
| LMArena Spanish | — | 1395 |
Instruction Following Not comparable
Claude 2: —, o3: 73.0 (#122)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| IFEval | — | 86.9% |
| LMArena Instruction Following | — | 1368 |
Long Context Not comparable
Claude 2: —, o3: 53.2 (#6)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| Fiction.LiveBench | — | 88.9% |
| CL-bench | — | 17.8% |
| LMArena Longer Query | — | 1372 |
Writing & Preference Not comparable
Claude 2: —, o3: 63.7 (#62)
| Benchmark | Claude 2 | o3 |
|---|---|---|
| LMArena Text | — | 1410 |
| LMArena Creative Writing | — | 1359 |
| Short-Story Creative Writing | — | 83.9% |
| EQ-Bench Creative Writing | — | 1676 |
| WildBench | — | 86.1% |
| LMArena Multi-Turn | — | 1405 |
Frequently asked questions
Is Claude 2 better than o3?
o3 is the stronger model overall, scoring 47.4 to 24.7 on the Noometry Index.
How many benchmarks do Claude 2 and o3 share?
5 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and o3 has 63.