Claude 3.5 Sonnet vs o3
Anthropic Claude 3.5 Sonnet | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Jun 20 2024 | 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. | 45%Best | 26% |
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. | 33.4% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 59.4% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet shipped 300 days before o3 | |
Which is better: Claude 3.5 Sonnet or o3?
Claude 3.5 Sonnet leads o3 on 1 of the 1 benchmark they both report (BullshitBench v2). Claude 3.5 Sonnet shipped 300 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.
On BullshitBench v2, Claude 3.5 Sonnet leads at 45% vs o3 at 26%.
Frequently asked questions
Claude 3.5 Sonnet was released by Anthropic on Jun 20 2024.
o3 was released by OpenAI on Apr 16 2025.
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