Claude Opus 4.1vsDeepSeek-V4-Flash
Claude Opus 4.1 | 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. | $15.00Amazon 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. | $75.00Amazon 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. | 43% | 18% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 80.9% | 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. | 74.5% | — |
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 | Aug 5 2025 | Apr 24 2026 |
| Access | Proprietary | Open Weight |
Other comparisons
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Frequently asked questions
Claude Opus 4.1 and DeepSeek-V4-Flash are evenly matched across the 2 benchmarks they both report (BullshitBench v2, GPQA Diamond). Claude Opus 4.1 shipped 262 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
Claude Opus 4.1 is proprietary, while DeepSeek-V4-Flash is open weight.
On BullshitBench v2, Claude Opus 4.1 leads at 43% vs DeepSeek-V4-Flash at 18%. On GPQA Diamond, DeepSeek-V4-Flash leads at 88.1% vs Claude Opus 4.1 at 80.9%.