GPT-5vsHorizon Alpha
Horizon Alpha is cheaper than GPT-5 at $0/M vs $1.25/M input tokens.
| Spec | GPT-5 | Horizon Alpha |
|---|---|---|
| Input price | $1.25/M tokens | Free |
| Output price | $10/M tokens | Free |
| Context window | 400K tokens | 256K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Aug 2025 | Jul 2025 |
Our Verdict
GPT-5
Horizon AlphaRunner-up
Not enough votes to call it. On the specs, GPT-5 has the edge: bigger model tier, bigger context window, major provider backing.
Slight edge
API pricing
Cost per 1M tokens
GPT-5
Input
$1.25
Output
$10.00
Horizon Alpha
Input
$0.000
Output
$0.000
Where to run it
2 hosts
Horizon Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
80%
GPT-5 uses 18.9x more bold
GPT-5
Horizon Alpha
65%Vocabulary65%
13wSentence Length14w
0.20Hedging0.22
0.2Bold0.0
4.6Lists3.5
0.00Emoji0.00
0.16Headings0.00
0.03Transitions0.12
Based on 16 + 14 text responses
Research
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FAQ
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