GPT-5.1 Codex MaxvsOwl Alpha
Owl Alpha is the newer model, released after GPT-5.1 Codex Max.
| Spec | GPT-5.1 Codex Max | Owl Alpha |
|---|---|---|
| Input price | — | Free |
| Output price | — | Free |
| Context window | — | 1.0M tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Dec 2025 | Apr 2026 |
Our Verdict
GPT-5.1 Codex Max
Owl AlphaRunner-up
Not enough votes to call it. On the specs, GPT-5.1 Codex Max has the edge: bigger model tier, major provider backing.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GPT-5.1 Codex Max
Input
—
Output
—
Owl Alpha
Input
$0.000
Output
$0.000
Where to run it
1 host
GPT-5.1 Codex Max1 host
Owl Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
36%
Owl Alpha uses 58.2x more emoji
GPT-5.1 Codex Max
Owl Alpha
60%Vocabulary59%
16wSentence Length21w
0.36Hedging0.56
2.3Bold4.5
4.2Lists3.1
0.00Emoji0.58
0.12Headings0.88
0.03Transitions0.10
Based on 13 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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