Claude Haiku 4.5 vs o1
Anthropic Claude Haiku 4.5 | OpenAI o1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Oct 15 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. | 77% | — |
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. | 73.3% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 73% | — |
| Timeline | ||
| Release gap | o1 shipped 314 days before Claude Haiku 4.5 | |
Which is better: Claude Haiku 4.5 or o1?
Claude Haiku 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 314 days before Claude Haiku 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 Haiku 4.5 and o1 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.
o1 was released by OpenAI on Dec 5 2024.
Other comparisons
Claude Haiku 4.5 vs Gemini Omnio1 vs Gemini OmniClaude Haiku 4.5 vs Muse Spark 1.1o1 vs Muse Spark 1.1Claude Haiku 4.5 vs Grok 4.5o1 vs Grok 4.5Claude Haiku 4.5 vs DeepSeek-V4-Proo1 vs DeepSeek-V4-ProClaude Haiku 4.5 vs Mistral Medium 3.5o1 vs Mistral Medium 3.5Claude Haiku 4.5 vs Kimi K2.7 Codeo1 vs Kimi K2.7 Code