Claude 3.5 Sonnet (upgraded)vsDeepSeek-V4-Flash-0731
Claude 3.5 Sonnet (upgraded) | DeepSeek-V4-Flash-0731 | |
|---|---|---|
| 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. | — | 38% |
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% | — |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 82.7% |
Personal tool use Toolathlon-VerifiedTests how well the AI uses everyday personal tools and apps to get things done — a human-checked version of Toolathlon. Higher is better. | — | 70.3% |
Cybersecurity CyberGymTests the AI on cybersecurity challenges — finding and exploiting software weaknesses inside a safe sandbox. Higher is better. | — | 76.7% |
Business workflows AutomationBenchTests whether the AI can run real multi-step business workflows — the kind of end-to-end office processes companies want to automate — from start to finish. Higher is better. | — | 25.1% |
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Oct 22 2024 | Jul 31 2026 |
| Access | Proprietary | Proprietary |
Which is better: Claude 3.5 Sonnet (upgraded) or DeepSeek-V4-Flash-0731?
Claude 3.5 Sonnet (upgraded) and DeepSeek-V4-Flash-0731 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 647 days before DeepSeek-V4-Flash-0731, 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 (upgraded) and DeepSeek-V4-Flash-0731 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-V4-Flash-0731 was released by DeepSeek on Jul 31 2026.
Other comparisons
Claude 3.5 Sonnet (upgraded)vsGPT-5.6 SolDeepSeek-V4-Flash-0731vsGPT-5.6 SolClaude 3.5 Sonnet (upgraded)vsGemini 3.6 FlashDeepSeek-V4-Flash-0731vsGemini 3.6 FlashClaude 3.5 Sonnet (upgraded)vsMuse Spark 1.1DeepSeek-V4-Flash-0731vsMuse Spark 1.1Claude 3.5 Sonnet (upgraded)vsGrok 4.5DeepSeek-V4-Flash-0731vsGrok 4.5Claude 3.5 Sonnet (upgraded)vsMistral Medium 3.5DeepSeek-V4-Flash-0731vsMistral Medium 3.5Claude 3.5 Sonnet (upgraded)vsKimi K3DeepSeek-V4-Flash-0731vsKimi K3