Claude Opus 4.5 vs o1
Anthropic Claude Opus 4.5 | OpenAI o1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Nov 24 2025 | Dec 5 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 shipped 354 days before Claude Opus 4.5 | |
Which is better: Claude Opus 4.5 or o1?
Claude Opus 4.5 and o1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o1 shipped 354 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 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 was released by OpenAI on Dec 5 2024.
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