GPT-5.1-CodexvsPony Alpha
Pony Alpha is cheaper than GPT-5.1-Codex at $0/M vs $1.25/M input tokens.
| Spec | GPT-5.1-Codex | Pony Alpha |
|---|---|---|
| Input price | $1.25/M tokens | Free |
| Output price | $10/M tokens | Free |
| Context window | 400K tokens | 200K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Feb 2026 |
Our Verdict
GPT-5.1-Codex
Pony AlphaRunner-up
Not enough votes to call it. On the specs, GPT-5.1-Codex has the edge: bigger model tier, bigger context window, 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
Input
$1.25
Output
$10.00
Pony Alpha
Input
$0.000
Output
$0.000
Where to run it
1 host
GPT-5.1-Codex1 host
Pony Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
46%
Pony Alpha uses 1.7x more bold
GPT-5.1-Codex
Pony Alpha
70%Vocabulary52%
17wSentence Length15w
0.39Hedging0.40
3.4Bold5.9
3.5Lists4.4
0.00Emoji0.00
0.50Headings0.71
0.38Transitions0.23
Based on 14 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
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