GPT-4 vs Horizon Beta

Compare GPT-4 by OpenAI against Horizon Beta by OpenRouter, context windows of 8K vs 256K, tested across 15 shared challenges. Updated April 2026.

Which is better, GPT-4 or Horizon Beta?

GPT-4 and Horizon Beta are both competitive models. GPT-4 costs $30/M input tokens vs $0/M for Horizon Beta. Context windows: 8K vs 256K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4 and Horizon Beta

GPT-4 is made by openai while Horizon Beta is from openrouter. GPT-4 has a 8K token context window compared to Horizon Beta's 256K. On pricing, GPT-4 costs $30/M input tokens vs $0/M for Horizon Beta.

Our Verdict
GPT-4
GPT-4
Horizon Beta
Horizon Beta

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call
Writing DNA

Style Comparison

Similarity
99%

GPT-4 uses 82.3x more bold

GPT-4
Horizon Beta
59%Vocabulary62%
18wSentence Length15w
1.10Hedging0.24
0.8Bold0.0
2.5Lists2.2
0.00Emoji0.00
0.00Headings0.00
0.45Transitions0.18
Based on 15 + 16 text responses
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Ask them anything yourself

GPT-4Horizon Beta

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

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