Claude 3 HaikuvsClaude Opus 4.5
Claude 3 Haiku | Claude Opus 4.5 | |
|---|---|---|
| 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% | 90%Best |
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. | 33.3% | 87%Best |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Mar 4 2024 | Nov 24 2025 |
| Access | Proprietary | Proprietary |
Which is better: Claude 3 Haiku or Claude Opus 4.5?
Claude Opus 4.5 leads Claude 3 Haiku on 2 of the 2 benchmarks they both report (BullshitBench v2, GPQA Diamond). Claude 3 Haiku shipped 630 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.
On BullshitBench v2, Claude Opus 4.5 leads at 90% vs Claude 3 Haiku at 10%. On GPQA Diamond, Claude Opus 4.5 leads at 87% vs Claude 3 Haiku at 33.3%.
Frequently asked questions
Claude 3 Haiku was released by Anthropic on Mar 4 2024.
Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
Claude Opus 4.5 leads on GPQA Diamond — Claude 3 Haiku 33.3% vs Claude Opus 4.5 87%.
Other comparisons
Claude 3 HaikuvsGPT-5.6-CyberClaude Opus 4.5vsGPT-5.6-CyberClaude 3 HaikuvsGemini 3.7 FlashClaude Opus 4.5vsGemini 3.7 FlashClaude 3 HaikuvsMuse GlimmerClaude Opus 4.5vsMuse GlimmerClaude 3 HaikuvsGrok 4.6Claude Opus 4.5vsGrok 4.6Claude 3 HaikuvsDeepSeek-V4-Pro-0813Claude Opus 4.5vsDeepSeek-V4-Pro-0813Claude 3 HaikuvsMistral Medium 3.5Claude Opus 4.5vsMistral Medium 3.5