Claude 3 Haiku vs GPT-5 nano
Anthropic Claude 3 Haiku | OpenAI GPT-5 nano | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Mar 4 2024 | Aug 7 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. | 10% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 33.3% | — |
| Timeline | ||
| Release gap | Claude 3 Haiku shipped 521 days before GPT-5 nano | |
Which is better: Claude 3 Haiku or GPT-5 nano?
Claude 3 Haiku and GPT-5 nano don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3 Haiku shipped 521 days before GPT-5 nano, 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 3 Haiku and GPT-5 nano don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3 Haiku was released by Anthropic on Mar 4 2024.
GPT-5 nano was released by OpenAI on Aug 7 2025.
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