Claude Opus 4vsClaude Sonnet 4
Claude Opus 4 | Claude Sonnet 4 | |
|---|---|---|
| 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. | 34% | 30% |
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. | 72.5% | 72.7% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 79.6% | 75.4% |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | May 22 2025 | May 22 2025 |
| Access | Proprietary | Proprietary |
Frequently asked questions
Claude Opus 4 leads Claude Sonnet 4 on 2 of the 3 benchmarks they both report (BullshitBench v2, SWE-Bench Verified, GPQA Diamond). Both models were released on the same day — May 22 2025.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, Claude Opus 4 leads at 34% vs Claude Sonnet 4 at 30%. On SWE-Bench Verified, Claude Sonnet 4 leads at 72.7% vs Claude Opus 4 at 72.5%. On GPQA Diamond, Claude Opus 4 leads at 79.6% vs Claude Sonnet 4 at 75.4%.
Claude Opus 4 was released by Anthropic on May 22 2025.
Claude Sonnet 4 was released by Anthropic on May 22 2025.
Claude Sonnet 4 leads on SWE-Bench Verified — Claude Opus 4 72.5% vs Claude Sonnet 4 72.7%.
Claude Opus 4 leads on GPQA Diamond — Claude Opus 4 79.6% vs Claude Sonnet 4 75.4%.