Horizon Beta
Nothing here. The model returned empty. We stared at it for a while.
Horizon Beta vs GPT-5 Codex
Compare Horizon Beta by OpenRouter against GPT-5 Codex by OpenAI, in 4 community votes, gpt-5 codex wins 100% of head-to-head duels, tested across 39 shared challenges. Updated April 2026.
Which is better, Horizon Beta or GPT-5 Codex?
GPT-5 Codex is the better choice overall, winning 100% of 4 blind community votes on Rival. Compare their real outputs side by side below.
Key Differences Between Horizon Beta and GPT-5 Codex
Horizon Beta is made by openrouter while GPT-5 Codex is from openai. In community voting, In 4 community votes, GPT-5 Codex wins 100% of head-to-head duels.
In 4 community votes, GPT-5 Codex wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 4+ human preference judgments for this pair.
Our Verdict
GPT-5 CodexWinner
Horizon BetaRunner-up
Pick GPT-5 Codex. In 4 blind votes, GPT-5 Codex wins 100% of the time. That's not luck.
Clear winner
Writing DNA
Style Comparison
Similarity
100%
GPT-5 Codex uses 229.7x more bold
Horizon Beta
GPT-5 Codex
62%Vocabulary64%
15wSentence Length17w
0.24Hedging0.38
0.0Bold2.3
2.2Lists3.5
0.00Emoji0.15
0.00Headings0.49
0.18Transitions0.05
Based on 16 + 13 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ