Claude 3 HaikuvsClaude Opus 4.1
Claude 3 Haiku | Claude Opus 4.1 | |
|---|---|---|
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given 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% | 43% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 33.3% | 80.9% |
| BenchmarksPublished by one model only | ||
SWE-Bench VerifiedCoding — Real 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. | — | 74.5% |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Mar 4 2024 | Aug 5 2025 |
| Access | Proprietary | Proprietary |
Frequently asked questions
Claude Opus 4.1 leads Claude 3 Haiku on 2 of the 2 benchmarks they both report (BullshitBench v2, GPQA Diamond). Claude 3 Haiku shipped 519 days before Claude Opus 4.1, 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 4.1 leads at 43% vs Claude 3 Haiku at 10%. On GPQA Diamond, Claude Opus 4.1 leads at 80.9% vs Claude 3 Haiku at 33.3%.
Claude 3 Haiku was released by Anthropic on Mar 4 2024.
Claude Opus 4.1 was released by Anthropic on Aug 5 2025.
Claude Opus 4.1 leads on GPQA Diamond — Claude 3 Haiku 33.3% vs Claude Opus 4.1 80.9%.
Other comparisons
Claude 3 HaikuvsGPT-5.6-CyberClaude Opus 4.1vsGPT-5.6-CyberClaude 3 HaikuvsGemini 3.7 FlashClaude Opus 4.1vsGemini 3.7 FlashClaude 3 HaikuvsMuse GlimmerClaude Opus 4.1vsMuse GlimmerClaude 3 HaikuvsGrok 4.6Claude Opus 4.1vsGrok 4.6Claude 3 HaikuvsDeepSeek-V4-Pro-0813Claude Opus 4.1vsDeepSeek-V4-Pro-0813Claude 3 HaikuvsMistral Medium 3.5Claude Opus 4.1vsMistral Medium 3.5