Claude 3 SonnetvsClaude Opus 4.5
Claude 3 Sonnet | 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. | — | 90% |
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. | 40.4% | 87%Best |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Mar 4 2024 | Nov 24 2025 |
| Access | Proprietary | Proprietary |
Which is better: Claude 3 Sonnet or Claude Opus 4.5?
Claude Opus 4.5 leads Claude 3 Sonnet on 1 of the 1 benchmark they both report (GPQA Diamond). Claude 3 Sonnet 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 GPQA Diamond, Claude Opus 4.5 leads at 87% vs Claude 3 Sonnet at 40.4%.
Frequently asked questions
Claude 3 Sonnet 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 Sonnet 40.4% vs Claude Opus 4.5 87%.
Other comparisons
Claude 3 SonnetvsGPT-5.6 SolClaude Opus 4.5vsGPT-5.6 SolClaude 3 SonnetvsGemini 3.6 FlashClaude Opus 4.5vsGemini 3.6 FlashClaude 3 SonnetvsMuse GlimmerClaude Opus 4.5vsMuse GlimmerClaude 3 SonnetvsGrok 4.5Claude Opus 4.5vsGrok 4.5Claude 3 SonnetvsDeepSeek-V4-Flash-0731Claude Opus 4.5vsDeepSeek-V4-Flash-0731Claude 3 SonnetvsMistral Medium 3.5Claude Opus 4.5vsMistral Medium 3.5