Claude 3.5 HaikuvsClaude Opus 4
Claude 3.5 Haiku | Claude Opus 4 | |
|---|---|---|
| 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. | 50%Best | 34% |
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. | 40.6% | 72.5%Best |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 41.6% | 79.6%Best |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Oct 22 2024 | May 22 2025 |
| Access | Proprietary | Proprietary |
Which is better: Claude 3.5 Haiku or Claude Opus 4?
Claude Opus 4 leads Claude 3.5 Haiku on 2 of the 3 benchmarks they both report (BullshitBench v2, SWE-Bench Verified, GPQA Diamond). Claude 3.5 Haiku shipped 212 days before Claude Opus 4, 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 Haiku leads at 50% vs Claude Opus 4 at 34%. On SWE-Bench Verified, Claude Opus 4 leads at 72.5% vs Claude 3.5 Haiku at 40.6%. On GPQA Diamond, Claude Opus 4 leads at 79.6% vs Claude 3.5 Haiku at 41.6%.
Frequently asked questions
Claude 3.5 Haiku was released by Anthropic on Oct 22 2024.
Claude Opus 4 was released by Anthropic on May 22 2025.
Claude Opus 4 leads on SWE-Bench Verified — Claude 3.5 Haiku 40.6% vs Claude Opus 4 72.5%.
Claude Opus 4 leads on GPQA Diamond — Claude 3.5 Haiku 41.6% vs Claude Opus 4 79.6%.