Model comparison
Claude 2 vs o3-pro
o3-pro is the stronger model overall, scoring 42.9 to 25.0 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude 2 scores higher in 0 categories and o3-pro in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3-pro leads 29.5 to 16.9.
- The biggest single-benchmark swing is DTBench: 51.9% for Claude 2 and 86.9% for o3-pro.
Side by side
| Claude 2 | o3-pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 25.0 | 42.9 |
| Released | 2023-07-11 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | — | 200K |
| Max output | — | 100K |
| Input $ / M tokens | — | $20 |
| Output $ / M tokens | — | $80 |
| Results tracked | 8 | 12 |
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Category by category
Coding Not comparable
Claude 2: —, o3-pro: 55.5 (#24)
| Benchmark | Claude 2 | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
| HumanEval+ | 61.6% | — |
Reasoning o3-pro leads
Claude 2: 21.7 (#216), o3-pro: 23.8 (#171)
| Benchmark | Claude 2 | o3-pro |
|---|---|---|
| DTBench | 51.9% | 86.9% |
| Epoch Capabilities Index | 120.13 | 147.42 |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| LMCA | — | 38.5% |
Math Not comparable
Claude 2: 9.3 (#320), o3-pro: —
| Benchmark | Claude 2 | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| MATH Level 5 | 11.7% | — |
Knowledge o3-pro leads
Claude 2: 16.9 (#287), o3-pro: 29.5 (#238)
| Benchmark | Claude 2 | o3-pro |
|---|---|---|
| GPQA Diamond | 34.7% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Long Context Not comparable
Claude 2: —, o3-pro: 72.2 (#1)
| Benchmark | Claude 2 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
Writing & Preference Not comparable
Claude 2: —, o3-pro: 57.1 (#133)
| Benchmark | Claude 2 | o3-pro |
|---|---|---|
| Short-Story Creative Writing | — | 84.4% |
Frequently asked questions
Is Claude 2 better than o3-pro?
o3-pro is the stronger model overall, scoring 42.9 to 25.0 on the Noometry Index.
How many benchmarks do Claude 2 and o3-pro share?
2 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and o3-pro has 12.