Claude Opus 4.1vsClaude Sonnet 4
Claude Opus 4.1 | Claude Sonnet 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. | 43%Best | 30% |
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. | 74.5%Best | 72.7% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 80.9%Best | 75.4% |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Aug 5 2025 | May 22 2025 |
| Access | Proprietary | Proprietary |
Which is better: Claude Opus 4.1 or Claude Sonnet 4?
Claude Opus 4.1 leads Claude Sonnet 4 on 3 of the 3 benchmarks they both report (BullshitBench v2, SWE-Bench Verified, GPQA Diamond). Claude Sonnet 4 shipped 75 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 Sonnet 4 at 30%. On SWE-Bench Verified, Claude Opus 4.1 leads at 74.5% vs Claude Sonnet 4 at 72.7%. On GPQA Diamond, Claude Opus 4.1 leads at 80.9% vs Claude Sonnet 4 at 75.4%.
Frequently asked questions
Claude Opus 4.1 was released by Anthropic on Aug 5 2025.
Claude Sonnet 4 was released by Anthropic on May 22 2025.
Claude Opus 4.1 leads on SWE-Bench Verified — Claude Opus 4.1 74.5% vs Claude Sonnet 4 72.7%.
Claude Opus 4.1 leads on GPQA Diamond — Claude Opus 4.1 80.9% vs Claude Sonnet 4 75.4%.