Claude Opus 4.5 vs o1-preview
Anthropic Claude Opus 4.5 | OpenAI o1-preview | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Nov 24 2025 | Sep 12 2024 |
| 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. | 90% | — |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 80.9% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 87% | — |
| Timeline | ||
| Release gap | o1-preview shipped 438 days before Claude Opus 4.5 | |
Which is better: Claude Opus 4.5 or o1-preview?
Claude Opus 4.5 and o1-preview don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o1-preview shipped 438 days before Claude Opus 4.5, 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 Opus 4.5 and o1-preview don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
o1-preview was released by OpenAI on Sep 12 2024.
Other comparisons
Claude Opus 4.5 vs Gemini Omnio1-preview vs Gemini OmniClaude Opus 4.5 vs Muse Spark 1.1o1-preview vs Muse Spark 1.1Claude Opus 4.5 vs Grok 4.5o1-preview vs Grok 4.5Claude Opus 4.5 vs DeepSeek-V4-Proo1-preview vs DeepSeek-V4-ProClaude Opus 4.5 vs Mistral Medium 3.5o1-preview vs Mistral Medium 3.5Claude Opus 4.5 vs Kimi K2.7 Codeo1-preview vs Kimi K2.7 Code