Claude 3.5 SonnetvsDeepSeek-V4-Flash
Claude 3.5 Sonnet | DeepSeek-V4-Flash | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | — | $0.0679DigitalOcean |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | — | $0.1621StreamLake |
| Benchmarks | ||
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% | 18% |
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% | 88.1% |
| BenchmarksPublished by one model only | ||
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% | — |
LiveCodeBenchCompetitive coding — Coding problems published so recently the AI can't have seen them in training — a contamination-free test of raw programming skill. Higher is better. | — | 91.6% |
| Overview | ||
| Company | Anthropic | DeepSeek |
| Release date | Jun 20 2024 | Apr 24 2026 |
| Access | Proprietary | Open Weight |
Other comparisons
Claude 3.5 SonnetvsGPT-6 AstraDeepSeek-V4-FlashvsGPT-6 AstraClaude 3.5 SonnetvsGemini 3.8 FlashDeepSeek-V4-FlashvsGemini 3.8 FlashClaude 3.5 SonnetvsMuse Spark 1.3DeepSeek-V4-FlashvsMuse Spark 1.3Claude 3.5 SonnetvsGrok 4.6DeepSeek-V4-FlashvsGrok 4.6Claude 3.5 SonnetvsMistral Medium 3.5DeepSeek-V4-FlashvsMistral Medium 3.5Claude 3.5 SonnetvsKimi K3DeepSeek-V4-FlashvsKimi K3
Frequently asked questions
Claude 3.5 Sonnet and DeepSeek-V4-Flash are evenly matched across the 2 benchmarks they both report (BullshitBench v2, GPQA Diamond). Claude 3.5 Sonnet shipped 673 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet is proprietary, while DeepSeek-V4-Flash is open weight.
On BullshitBench v2, Claude 3.5 Sonnet leads at 45% vs DeepSeek-V4-Flash at 18%. On GPQA Diamond, DeepSeek-V4-Flash leads at 88.1% vs Claude 3.5 Sonnet at 59.4%.