Claude 3.5 SonnetvsDeepSeek-V4.1-Flash
Claude 3.5 Sonnet | DeepSeek-V4.1-Flash | |
|---|---|---|
| Benchmarks | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 59.4% | 90.9% |
| BenchmarksPublished by one model only | ||
BullshitBench v2Nonsense detection — Given 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. | 45% | — |
SWE-Bench VerifiedCoding — Real 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. | 33.4% | — |
DeepSWE 1.1Agentic coding — Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | — | 74.2% |
NL2Repo-BenchRepo-level code generation — Tests whether the AI can turn a natural-language requirement into working code across an entire repository, not just produce a single function or patch. Higher is better. | — | 65.4% |
Terminal-Bench 4.0Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Version 4.0 recalibrated how much time, CPU and memory each task gets, removed eight tasks and fixed nineteen, so fewer runs fail for reasons that have nothing to do with the model. Scores are not comparable with earlier versions. Higher is better. | — | 31.2% |
Terminal-Bench 3.0Agentic terminal coding — command-line task completion (v3.0, much harder task set) | — | 30% |
Terminal-Bench 2.1Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 90.6% |
CyberGymCybersecurity — Tests the AI on cybersecurity challenges — finding and exploiting software weaknesses inside a safe sandbox. Higher is better. | — | 88.1% |
Humanity's Last Exam · no toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects, written so you can't just look up the answer. “No tools” means the AI answers on its own. Higher is better. | — | 36.8% |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | — | 63.9% |
Agent's Last Exam · pass@1Agentic computer use — A hard set of desktop and operating-system tasks an AI agent has to finish by looking at the screen and working the machine itself. The score is the share it passes outright — partial credit does not count. Higher is better. | — | 31.8% |
AutomationBenchBusiness workflows — Tests 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. | — | 54.8% |
Chartography · with toolsChart tasks — A chart-centred test run with tools available to the AI, reported separately from the chart-reading benchmarks above it. Higher is better. | — | 78.9% |
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Jun 20 2024 | Sep 10 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Claude 3.5 SonnetvsGPT-6 AstraDeepSeek-V4.1-FlashvsGPT-6 AstraClaude 3.5 SonnetvsGemini 3.8 FlashDeepSeek-V4.1-FlashvsGemini 3.8 FlashClaude 3.5 SonnetvsMuse Spark 1.3DeepSeek-V4.1-FlashvsMuse Spark 1.3Claude 3.5 SonnetvsGrok 4.6DeepSeek-V4.1-FlashvsGrok 4.6Claude 3.5 SonnetvsMistral Medium 3.5DeepSeek-V4.1-FlashvsMistral Medium 3.5Claude 3.5 SonnetvsKimi K3DeepSeek-V4.1-FlashvsKimi K3
Frequently asked questions
DeepSeek-V4.1-Flash leads Claude 3.5 Sonnet on 1 of the 1 benchmark they both report (GPQA Diamond). Claude 3.5 Sonnet shipped 812 days before DeepSeek-V4.1-Flash, 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.
On GPQA Diamond, DeepSeek-V4.1-Flash leads at 90.9% vs Claude 3.5 Sonnet at 59.4%.