GPT-5 vs Horizon Beta
Compare GPT-5 by OpenAI against Horizon Beta by OpenRouter, context windows of 400K vs 256K, tested across 39 shared challenges.
Our Verdict
GPT-5
Horizon BetaRunner-up
No community votes yet. On paper, 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 Beta
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
86%
GPT-5 uses 18.9x more bold
GPT-5
Horizon Beta
65%Vocabulary62%
13wSentence Length15w
0.20Hedging0.24
0.2Bold0.0
4.6Lists2.2
0.00Emoji0.00
0.16Headings0.00
0.03Transitions0.18
Based on 16 + 16 text responses
Research
What we learned reading every model
FAQ
