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Claude Opus 4 vs Horizon Beta

Compare Claude Opus 4 by Anthropic against Horizon Beta by OpenRouter, in 55 community votes, claude opus 4 and horizon beta are closely matched, context windows of 200K vs 256K, tested across 27 shared challenges. Updated April 2026.

Which is better, Claude Opus 4 or Horizon Beta?

Claude Opus 4 and Horizon Beta are closely matched based on 55 community votes. Claude Opus 4 costs $15/M input tokens vs $0/M for Horizon Beta. Context windows: 200K vs 256K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4 and Horizon Beta

Claude Opus 4 is made by anthropic while Horizon Beta is from openrouter. Claude Opus 4 has a 200K token context window compared to Horizon Beta's 256K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0/M for Horizon Beta. In community voting, In 55 community votes, Claude Opus 4 and Horizon Beta are closely matched.

In 55 community votes, Claude Opus 4 and Horizon Beta are closely matched. Claude Opus 4 leads in Web Design, Reasoning, while Horizon Beta leads in Image Generation, Conversation, Analysis. Based on blind community voting from the Rival open dataset of 55+ human preference judgments for this pair.

Web Design: Claude Opus 4 wins 70% of votes
Image Generation: Horizon Beta wins 86% of votes
Reasoning: Claude Opus 4 wins 75% of votes
Conversation: Horizon Beta wins 67% of votes
Analysis: Horizon Beta wins 100% of votes
Our Verdict
Claude Opus 4
Claude Opus 4
Horizon Beta
Horizon Beta

Too close to call. Pick based on your use case.

Pick Claude Opus 4 for Reasoning, Web Design. Pick Horizon Beta for Analysis, Image Generation, Conversation.

Too close to call
Writing DNA

Style Comparison

Similarity
92%

Claude Opus 4 uses 444.0x more bold

Claude Opus 4
Horizon Beta
64%Vocabulary62%
62wSentence Length15w
0.52Hedging0.24
4.4Bold0.0
9.1Lists2.2
0.11Emoji0.00
1.87Headings0.00
0.27Transitions0.18
Based on 16 + 16 text responses
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Claude Opus 4Horizon Beta

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

AI Hallucination Index 2026
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