Claude 3.5 Sonnet vs GPT-5.1-Codex-Max
Anthropic Claude 3.5 Sonnet | OpenAI GPT-5.1-Codex-Max | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Jun 20 2024 | Nov 19 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. | 45% | — |
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. | 33.4% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 59.4% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet shipped 517 days before GPT-5.1-Codex-Max | |
Which is better: Claude 3.5 Sonnet or GPT-5.1-Codex-Max?
Claude 3.5 Sonnet and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3.5 Sonnet shipped 517 days before GPT-5.1-Codex-Max, 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.
Direct benchmark comparisons are unavailable — Claude 3.5 Sonnet and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3.5 Sonnet was released by Anthropic on Jun 20 2024.
GPT-5.1-Codex-Max was released by OpenAI on Nov 19 2025.
Other comparisons
Claude 3.5 Sonnet vs Gemini OmniGPT-5.1-Codex-Max vs Gemini OmniClaude 3.5 Sonnet vs Muse Spark 1.1GPT-5.1-Codex-Max vs Muse Spark 1.1Claude 3.5 Sonnet vs Grok 4.5GPT-5.1-Codex-Max vs Grok 4.5Claude 3.5 Sonnet vs DeepSeek-V4-ProGPT-5.1-Codex-Max vs DeepSeek-V4-ProClaude 3.5 Sonnet vs Mistral Medium 3.5GPT-5.1-Codex-Max vs Mistral Medium 3.5Claude 3.5 Sonnet vs Kimi K2.7 CodeGPT-5.1-Codex-Max vs Kimi K2.7 Code