Claude Opus 4 vs Horizon Alpha
Compare Claude Opus 4 by Anthropic against Horizon Alpha by OpenRouter, in 22 community votes, horizon alpha wins 56% of head-to-head duels, context windows of 200K vs 256K, tested across 33 shared challenges. Updated May 2026.
Which is better, Claude Opus 4 or Horizon Alpha?
Horizon Alpha is the better choice overall, winning 56% of 22 blind community votes on Rival. Claude Opus 4 costs $15/M input tokens vs $0/M for Horizon Alpha. Context windows: 200K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and Horizon Alpha
Claude Opus 4 is made by anthropic while Horizon Alpha is from openrouter. Claude Opus 4 has a 200K token context window compared to Horizon Alpha's 256K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0/M for Horizon Alpha. In community voting, In 22 community votes, Horizon Alpha wins 56% of head-to-head duels.
In 22 community votes, Horizon Alpha wins 56% of head-to-head duels. Horizon Alpha leads in Web Design. Based on blind community voting from the Rival open dataset of 22+ human preference judgments for this pair.
Per 1M tokens
Horizon Alpha has the edge overall. In 22 blind votes, Horizon Alpha wins 56% of the time.
Horizon Alpha particularly excels in Web Design.
Style Comparison
Claude Opus 4 uses 444.0x more bold
