Claude 3.5 Sonnet (upgraded) vs GPT-5.1
Anthropic Claude 3.5 Sonnet (upgraded) | OpenAI GPT-5.1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Oct 22 2024 | Nov 12 2025 |
| Access | Proprietary | Proprietary |
| 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. | — | 25% |
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. | 49% | 76.3%Best |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 88.1% |
Multimodal MMMUTests the AI on understanding images and text together across many college subjects. Higher is better. | — | 76% |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 386 days before GPT-5.1 | |
Which is better: Claude 3.5 Sonnet (upgraded) or GPT-5.1?
GPT-5.1 leads Claude 3.5 Sonnet (upgraded) on 1 of the 1 benchmark they both report (SWE-Bench Verified). Claude 3.5 Sonnet (upgraded) shipped 386 days before GPT-5.1, 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 SWE-Bench Verified, GPT-5.1 leads at 76.3% vs Claude 3.5 Sonnet (upgraded) at 49%.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
GPT-5.1 was released by OpenAI on Nov 12 2025.
GPT-5.1 leads on SWE-Bench Verified — Claude 3.5 Sonnet (upgraded) 49% vs GPT-5.1 76.3%.
Other comparisons
Claude 3.5 Sonnet (upgraded) vs Gemini OmniGPT-5.1 vs Gemini OmniClaude 3.5 Sonnet (upgraded) vs Muse Spark 1.1GPT-5.1 vs Muse Spark 1.1Claude 3.5 Sonnet (upgraded) vs Grok 4.5GPT-5.1 vs Grok 4.5Claude 3.5 Sonnet (upgraded) vs DeepSeek-V4-ProGPT-5.1 vs DeepSeek-V4-ProClaude 3.5 Sonnet (upgraded) vs Mistral Medium 3.5GPT-5.1 vs Mistral Medium 3.5Claude 3.5 Sonnet (upgraded) vs Kimi K2.7 CodeGPT-5.1 vs Kimi K2.7 Code