DeepSeek V4 ProvsGPT-5.1 Chat
GPT-5.1 Chat is cheaper than DeepSeek V4 Pro at $1.25/M vs $1.74/M input tokens.
| Spec | DeepSeek V4 Pro | GPT-5.1 Chat |
|---|---|---|
| Input price | $1.74/M tokens | $1.25/M tokens |
| Output price | $3.48/M tokens | $10/M tokens |
| Context window | 1.0M tokens | 128K tokens |
| Weights | Open | — |
| Free API (OpenRouter) | No | No |
| Released | Apr 2026 | Nov 2025 |
Our Verdict
DeepSeek V4 Pro
GPT-5.1 ChatRunner-up
Not enough votes to call it. On the specs, DeepSeek V4 Pro has the edge: bigger model tier, newer, bigger context window.
Slight edge
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 Chat
Input
$1.25
1.4× cheaper
Output
$10.00
GPT-5.1 Chat wins input (1.4× cheaper)·DeepSeek V4 Pro wins output (2.9× cheaper)
Where to run it
15 hosts, cheapest first
DeepSeek V4 Pro15 hosts
DigitalOcean$0.87 in$1.74 out1M97% upBaidu Qianfanfp8$0.96 in$1.91 out1M99.7% upGMI Cloudfp8$0.96 in$1.91 out1M99.6% upDeepInfrafp8$1.30 in$2.60 out1M99.2% upAlibaba Cloudfp8$1.42 in$2.83 out1M100% upSiliconFlowfp8$1.50 in$3.13 out1M97.9% up
9 more hostsFewer hosts
Novitafp8$1.60 in$3.20 out1M100% upAtlasCloudfp4$1.68 in$3.38 out1M99.1% upBasetenfp4$1.74 in$3.48 out1M98.1% upParasailfp8$1.74 in$3.48 out1M99% upAzure AI Foundry$1.91 in$3.83 out1M98.3% upNextBitfp8$2.00 in$4.00 out1M99.8% upStreamLakefp8degraded$0.95 in$1.90 out1M96.7% upFireworksdegraded$1.20 in$1.20 out1M0% upVenicedegraded$1.65 in$3.30 out1M96.2% up
GPT-5.1 Chat
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
68%
DeepSeek V4 Pro uses 3.5x more emoji
DeepSeek V4 Pro
GPT-5.1 Chat
57%Vocabulary73%
18wSentence Length18w
0.52Hedging0.45
3.3Bold1.1
2.3Lists2.4
0.04Emoji0.00
0.45Headings0.00
0.15Transitions0.06
Based on 27 + 15 text responses
Research
What we learned reading every model
FAQ
Common questions
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