DeepSeek V3.1vsGPT-5.1-Codex
DeepSeek V3.1 is cheaper than GPT-5.1-Codex at $0.2/M vs $1.25/M input tokens.
| Spec | DeepSeek V3.1 | GPT-5.1-Codex |
|---|---|---|
| Input price | $0.2/M tokens | $1.25/M tokens |
| Output price | $0.8/M tokens | $10/M tokens |
| Context window | 164K tokens | 400K tokens |
| Released | Aug 2025 | Nov 2025 |
| SWE-bench Verified | 66.0% | 73.7% |
Our Verdict
GPT-5.1-Codex
DeepSeek V3.1Runner-up
Not enough votes to call it. On the specs, GPT-5.1-Codex has the edge: newer, bigger context window.
DeepSeek V3.1 costs 13x less per token.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V3.1
Input
$0.20
6.3× cheaper
Output
$0.80
13× cheaper
GPT-5.1-Codex
Input
$1.25
Output
$10.00
DeepSeek V3.1 is cheaper on both — 6.3× input, 13× output
Writing DNA
Style Comparison
Similarity
57%
DeepSeek V3.1 uses 2.4x more emoji
DeepSeek V3.1
GPT-5.1-Codex
53%Vocabulary70%
14wSentence Length17w
0.42Hedging0.39
4.0Bold3.4
3.6Lists3.5
0.02Emoji0.00
0.40Headings0.50
0.22Transitions0.38
Based on 23 + 14 text responses
Research
What we learned reading every model
FAQ
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