DeepSeek V4 ProvsGPT-5.1
GPT-5.1 is cheaper than DeepSeek V4 Pro at $1.25/M vs $1.74/M input tokens.
| Spec | DeepSeek V4 Pro | GPT-5.1 |
|---|---|---|
| Input price | $1.74/M tokens | $1.25/M tokens |
| Output price | $3.48/M tokens | $10/M tokens |
| Context window | 1.0M tokens | 400K tokens |
| Weights | Open | Closed |
| Free API (OpenRouter) | No | No |
| Released | Apr 2026 | Nov 2025 |
Our Verdict
DeepSeek V4 Pro
GPT-5.1Runner-up
Not enough votes to call it. On the specs, DeepSeek V4 Pro has the edge: newer, bigger context window.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
DeepSeek V4 Pro
Input
$1.74
Output
$3.48
2.9× cheaper
GPT-5.1
Input
$1.25
1.4× cheaper
Output
$10.00
GPT-5.1 wins input (1.4× cheaper)·DeepSeek V4 Pro wins output (2.9× cheaper)
Where to run it
16 hosts, cheapest first
DeepSeek V4 Pro14 hosts
StreamLakefp8$0.65 in$1.29 out1M98.6% upBaidu Qianfanfp8$0.66 in$1.31 out1M100% upDigitalOcean$0.87 in$1.74 out1M100% upGMI Cloudfp8$0.96 in$1.91 out1M99.7% upDeepInfrafp8$1.30 in$2.60 out1M99.5% upAlibaba Cloudfp8$1.42 in$2.83 out1M100% up
8 more hostsFewer hosts
SiliconFlowfp8$1.50 in$3.13 out1M98.4% upNovitafp8$1.60 in$3.20 out1M100% upVenice$1.65 in$3.30 out1M98.4% upAtlasCloudfp4$1.68 in$3.38 out1M99.3% upBasetenfp4$1.74 in$3.48 out1M99.8% upParasailfp8$1.74 in$3.48 out1M99.8% upAzure AI Foundry$1.91 in$3.83 out1M99.3% upNextBitfp8$2.00 in$4.00 out1M99.9% up
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
41%
DeepSeek V4 Pro uses 3.5x more emoji
DeepSeek V4 Pro
GPT-5.1
57%Vocabulary62%
18wSentence Length19w
0.52Hedging0.29
3.3Bold3.5
2.3Lists7.2
0.04Emoji0.00
0.45Headings0.61
0.15Transitions0.03
Based on 27 + 14 text responses
Research
What we learned reading every model
FAQ
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