Claude Sonnet 4vsDeepSeek-V4-Flash
Claude Sonnet 4 | 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. | $3.00Amazon Bedrock | $0.0679DigitalOcean |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $15.00Amazon Bedrock | $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. | 30% | 18% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.4% | 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. | 72.7% | — |
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 | May 22 2025 | Apr 24 2026 |
| Access | Proprietary | Open Weight |
Other comparisons
Claude Sonnet 4vsGPT-6 AstraDeepSeek-V4-FlashvsGPT-6 AstraClaude Sonnet 4vsGemini 3.8 FlashDeepSeek-V4-FlashvsGemini 3.8 FlashClaude Sonnet 4vsMuse Spark 1.3DeepSeek-V4-FlashvsMuse Spark 1.3Claude Sonnet 4vsGrok 4.6DeepSeek-V4-FlashvsGrok 4.6Claude Sonnet 4vsMistral Medium 3.5DeepSeek-V4-FlashvsMistral Medium 3.5Claude Sonnet 4vsKimi K3DeepSeek-V4-FlashvsKimi K3
Frequently asked questions
Claude Sonnet 4 and DeepSeek-V4-Flash are evenly matched across the 2 benchmarks they both report (BullshitBench v2, GPQA Diamond). Claude Sonnet 4 shipped 337 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
Claude Sonnet 4 is proprietary, while DeepSeek-V4-Flash is open weight.
On BullshitBench v2, Claude Sonnet 4 leads at 30% vs DeepSeek-V4-Flash at 18%. On GPQA Diamond, DeepSeek-V4-Flash leads at 88.1% vs Claude Sonnet 4 at 75.4%.