Claude 3.7 SonnetvsDeepSeek V4 Flash
DeepSeek V4 Flash is cheaper than Claude 3.7 Sonnet at $0.14/M vs $3/M input tokens.
| Spec | Claude 3.7 Sonnet | DeepSeek V4 Flash |
|---|---|---|
| Input price | $3/M tokens | $0.14/M tokens |
| Output price | $15/M tokens | $0.28/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Feb 2025 | Apr 2026 |
Our Verdict
DeepSeek V4 Flash
Claude 3.7 SonnetRunner-up
Not enough votes to call it. On the specs, DeepSeek V4 Flash has the edge: newer, bigger context window.
DeepSeek V4 Flash costs 54x less per token.
Too close to call
API pricing
Cost per 1M tokens
Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
DeepSeek V4 Flash
Input
$0.14
21× cheaper
Output
$0.28
54× cheaper
DeepSeek V4 Flash is cheaper on both: 21× input, 54× output.
Where to run it
15 hosts, cheapest first
Claude 3.7 Sonnet
No hosts listed on OpenRouter.
DeepSeek V4 Flash15 hosts
Baidu Qianfanfp8$0.07 in$0.14 out1M98.7% upDigitalOcean$0.07 in$0.17 out1M99.7% upStreamLakefp8$0.07 in$0.14 out1M96.8% upDeepInfrafp8$0.09 in$0.18 out1M99.2% upGMI Cloudfp8$0.09 in$0.18 out1M99.1% upSiliconFlowfp8$0.13 in$0.28 out1M99.5% up
9 more hostsFewer hosts
Alibaba Cloudfp8$0.13 in$0.27 out1M92.7% upVenice$0.14 in$0.28 out1M96.8% upAtlasCloudfp4$0.14 in$0.28 out1M99.6% upNovitafp8$0.14 in$0.28 out1M99.9% upParasailfp8$0.14 in$0.28 out1M99.7% upNextBitfp8$0.15 in$0.35 out1M99.9% upMancerfp8$0.19 in$0.50 out1M98% upPhala$0.20 in$0.40 out1M99.8% upAzure AI Foundry$0.21 in$0.56 out1M93.5% up
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
39%
Claude 3.7 Sonnet uses 4.4x more headings
Claude 3.7 Sonnet
DeepSeek V4 Flash
61%Vocabulary54%
33wSentence Length17w
0.83Hedging0.52
2.2Bold3.6
4.9Lists2.6
0.00Emoji0.00
1.78Headings0.41
0.16Transitions0.19
Based on 26 + 27 text responses
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