Claude 3.5 Sonnet (upgraded) vs DeepSeek V3.1
Anthropic Claude 3.5 Sonnet (upgraded) | DeepSeek DeepSeek V3.1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Oct 22 2024 | Aug 21 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 303 days before DeepSeek V3.1 | |
Which is better: Claude 3.5 Sonnet (upgraded) or DeepSeek V3.1?
Claude 3.5 Sonnet (upgraded) and DeepSeek V3.1 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 303 days before DeepSeek V3.1, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet (upgraded) is proprietary, while DeepSeek V3.1 is open weight.
Direct benchmark comparisons are unavailable — Claude 3.5 Sonnet (upgraded) and DeepSeek V3.1 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 was released by DeepSeek on Aug 21 2025.
Claude 3.5 Sonnet (upgraded) is a proprietary model released by Anthropic. DeepSeek V3.1 is an open weight model released by DeepSeek.