Mistral Devstral Small 1.1vsOpenAI o3
Mistral Devstral Small 1.1 is cheaper than OpenAI o3 at $0.1/M vs $10/M input tokens.
| Spec | Mistral Devstral Small 1.1 | OpenAI o3 |
|---|---|---|
| Input price | $0.1/M tokens | $10/M tokens |
| Output price | $0.3/M tokens | $40/M tokens |
| Weights | Open | Closed |
| Free API (OpenRouter) | No | No |
| Released | Jul 2025 | Apr 2025 |
| SWE-bench Verified | 46.8% | 69.1% |
Our Verdict
OpenAI o3
Mistral Devstral Small 1.1Runner-up
Not enough votes to call it. On the specs, OpenAI o3 has the edge: bigger model tier, major provider backing.
Mistral Devstral Small 1.1 costs 133x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Mistral Devstral Small 1.1
Input
$0.10
100× cheaper
Output
$0.30
133× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Mistral Devstral Small 1.1 is cheaper on both: 100× input, 133× output.
Where to run it
1 host
Mistral Devstral Small 1.1
No hosts listed on OpenRouter.
OpenAI o31 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
33%
Mistral Devstral Small 1.1 uses 6.4x more bold
Mistral Devstral Small 1.1
OpenAI o3
51%Vocabulary70%
18wSentence Length14w
0.55Hedging0.27
3.8Bold0.6
5.1Lists2.8
0.00Emoji0.00
0.07Headings0.32
0.28Transitions0.10
Based on 27 + 19 text responses
Research
What we learned reading every model
FAQ
Common questions
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