Claude 3 Sonnet vs DeepSeek V3.1 Terminus
Anthropic Claude 3 Sonnet | DeepSeek DeepSeek V3.1 Terminus | |
|---|---|---|
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Mar 4 2024 | Sep 22 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
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% | — |
| Timeline | ||
| Release gap | Claude 3 Sonnet shipped 567 days before DeepSeek V3.1 Terminus | |
Which is better: Claude 3 Sonnet or DeepSeek V3.1 Terminus?
Claude 3 Sonnet 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 3 Sonnet shipped 567 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.
Claude 3 Sonnet is proprietary, while DeepSeek V3.1 Terminus is open weight.
Direct benchmark comparisons are unavailable — Claude 3 Sonnet and DeepSeek V3.1 Terminus don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3 Sonnet was released by Anthropic on Mar 4 2024.
DeepSeek V3.1 Terminus was released by DeepSeek on Sep 22 2025.
Claude 3 Sonnet 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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