Mistral Devstral Small 1.1vsGPT-5.1-Codex
Mistral Devstral Small 1.1 is cheaper than GPT-5.1-Codex at $0.1/M vs $1.25/M input tokens.
| Spec | Mistral Devstral Small 1.1 | GPT-5.1-Codex |
|---|---|---|
| Input price | $0.1/M tokens | $1.25/M tokens |
| Output price | $0.3/M tokens | $10/M tokens |
| Context window | — | 400K tokens |
| Released | Jul 2025 | Nov 2025 |
| SWE-bench Verified | 46.8% | 73.7% |
Our Verdict
GPT-5.1-Codex
Mistral Devstral Small 1.1Runner-up
Not enough votes to call it. On the specs, GPT-5.1-Codex has the edge: bigger model tier, newer, bigger context window, major provider backing.
Mistral Devstral Small 1.1 costs 33x less per token.
Slight edge
API pricing
Cost per 1M tokens
Mistral Devstral Small 1.1
Input
$0.10
13× cheaper
Output
$0.30
33× cheaper
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Mistral Devstral Small 1.1 is cheaper on both — 13× input, 33× output
Writing DNA
Style Comparison
Similarity
58%
GPT-5.1-Codex uses 10.4x more headings
Mistral Devstral Small 1.1
GPT-5.1-Codex
50%Vocabulary70%
17wSentence Length17w
0.56Hedging0.39
4.3Bold3.4
5.7Lists3.5
0.00Emoji0.00
0.05Headings0.50
0.34Transitions0.38
Based on 21 + 14 text responses
Research
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FAQ
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