Claude Sonnet 4.5 vs o1
Anthropic Claude Sonnet 4.5 | OpenAI o1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Sep 29 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. | 79% | — |
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. | 77.2% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 50% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 83.4% | — |
Multimodal MMMUTests the AI on understanding images and text together across many college subjects. Higher is better. | 68% | — |
| Timeline | ||
| Release gap | o1 shipped 298 days before Claude Sonnet 4.5 | |
Which is better: Claude Sonnet 4.5 or o1?
Claude Sonnet 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 298 days before Claude Sonnet 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 Sonnet 4.5 and o1 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Sonnet 4.5 was released by Anthropic on Sep 29 2025.
o1 was released by OpenAI on Dec 5 2024.
Other comparisons
Claude Sonnet 4.5 vs Gemini Omnio1 vs Gemini OmniClaude Sonnet 4.5 vs Muse Spark 1.1o1 vs Muse Spark 1.1Claude Sonnet 4.5 vs Grok 4.5o1 vs Grok 4.5Claude Sonnet 4.5 vs DeepSeek-V4-Proo1 vs DeepSeek-V4-ProClaude Sonnet 4.5 vs Mistral Medium 3.5o1 vs Mistral Medium 3.5Claude Sonnet 4.5 vs Kimi K2.7 Codeo1 vs Kimi K2.7 Code