Claude 3.5 Sonnet (upgraded) vs DeepSeek V3.1 Terminus
Anthropic Claude 3.5 Sonnet (upgraded) | DeepSeek DeepSeek V3.1 Terminus | |
|---|---|---|
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Oct 22 2024 | Sep 22 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
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% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 335 days before DeepSeek V3.1 Terminus | |
Which is better: Claude 3.5 Sonnet (upgraded) or DeepSeek V3.1 Terminus?
Claude 3.5 Sonnet (upgraded) 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 3.5 Sonnet (upgraded) shipped 335 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet (upgraded) is proprietary, while DeepSeek V3.1 Terminus is open weight.
Direct benchmark comparisons are unavailable — Claude 3.5 Sonnet (upgraded) and DeepSeek V3.1 Terminus don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
DeepSeek V3.1 Terminus was released by DeepSeek on Sep 22 2025.
Claude 3.5 Sonnet (upgraded) is a proprietary model released by Anthropic. DeepSeek V3.1 Terminus is an open weight model released by DeepSeek.