GPT-5.1-CodexvsHy4 Preview
Hy4 Preview is cheaper than GPT-5.1-Codex at $0.834/M vs $1.25/M input tokens.
| Spec | GPT-5.1-Codex | Hy4 Preview |
|---|---|---|
| Input price | $1.25/M tokens | $0.834/M tokens |
| Output price | $10/M tokens | $2.501/M tokens |
| Context window | 400K tokens | 1.0M tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Aug 2026 |
Our Verdict
GPT-5.1-Codex
Hy4 Preview
Not enough votes to call it. On the specs, nothing separates them.
Hy4 Preview costs 4.0x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Hy4 Preview
Input
$0.83
1.5× cheaper
Output
$2.50
4.0× cheaper
Hy4 Preview is cheaper on both: 1.5× input, 4.0× output.
Where to run it
2 hosts
GPT-5.1-Codex1 host
Hy4 Preview1 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
31%
Hy4 Preview uses 40.1x more emoji
GPT-5.1-Codex
Hy4 Preview
70%Vocabulary53%
17wSentence Length16w
0.39Hedging0.43
3.4Bold5.9
3.5Lists3.8
0.00Emoji0.40
0.50Headings0.67
0.38Transitions0.13
Based on 14 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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