GPT-5.1 ChatvsHy4 Preview
Hy4 Preview is cheaper than GPT-5.1 Chat at $0.834/M vs $1.25/M input tokens.
| Spec | GPT-5.1 Chat | Hy4 Preview |
|---|---|---|
| Input price | $1.25/M tokens | $0.834/M tokens |
| Output price | $10/M tokens | $2.501/M tokens |
| Context window | 128K tokens | 1.0M tokens |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Aug 2026 |
Our Verdict
Hy4 Preview
GPT-5.1 ChatRunner-up
Not enough votes to call it. On the specs, Hy4 Preview has the edge: bigger model tier, newer, bigger context window.
Hy4 Preview costs 4.0x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1 Chat
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
1 host
GPT-5.1 Chat
No hosts listed on OpenRouter.
Hy4 Preview1 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
35%
Hy4 Preview uses 40.1x more emoji
GPT-5.1 Chat
Hy4 Preview
73%Vocabulary53%
18wSentence Length16w
0.45Hedging0.43
1.1Bold5.9
2.4Lists3.8
0.00Emoji0.40
0.00Headings0.67
0.06Transitions0.13
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
More comparisons
GPT-5.1 Chat vs Ox AlphaNew provider
GPT-5.1 Chat vs MiniMax M3New provider
GPT-5.1 Chat vs Claude Opus 4.1New provider
GPT-5.1 Chat vs MiniMax M2.7New provider
GPT-5.1 Chat vs Nemotron 3.5 LightningNew provider
GPT-5.1 Chat vs NVIDIA Nemotron Nano 9B V2New provider
GPT-5.1 Chat vs North Mini CodeNew provider
Hy4 Preview vs Amazon Nova 2 LiteNew provider