Claude 2.1 vs o3
Anthropic Claude 2.1 | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Nov 21 2023 | Apr 16 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 26% |
| Timeline | ||
| Release gap | Claude 2.1 shipped 512 days before o3 | |
Which is better: Claude 2.1 or o3?
Claude 2.1 and o3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 2.1 shipped 512 days before o3, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Claude 2.1 and o3 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 2.1 was released by Anthropic on Nov 21 2023.
o3 was released by OpenAI on Apr 16 2025.