Claude Opus 4.1 vs DeepSeek V3.1 Terminus
Anthropic Claude Opus 4.1 | DeepSeek DeepSeek V3.1 Terminus | |
|---|---|---|
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Aug 5 2025 | Sep 22 2025 |
| Access | Proprietary | Open Weight |
| 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% | — |
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% | — |
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% | — |
| Timeline | ||
| Release gap | Claude Opus 4.1 shipped 48 days before DeepSeek V3.1 Terminus | |
Which is better: Claude Opus 4.1 or DeepSeek V3.1 Terminus?
Claude Opus 4.1 and DeepSeek V3.1 Terminus don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Opus 4.1 shipped 48 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.
Claude Opus 4.1 is proprietary, while DeepSeek V3.1 Terminus is open weight.
Direct benchmark comparisons are unavailable — Claude Opus 4.1 and DeepSeek V3.1 Terminus don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4.1 was released by Anthropic on Aug 5 2025.
DeepSeek V3.1 Terminus was released by DeepSeek on Sep 22 2025.
Claude Opus 4.1 is a proprietary model released by Anthropic. DeepSeek V3.1 Terminus is an open weight model released by DeepSeek.
Other comparisons
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