Claude Sonnet 4 vs Horizon Alpha
Compare Claude Sonnet 4 by Anthropic against Horizon Alpha by OpenRouter, in 26 community votes, horizon alpha wins 56% of head-to-head duels, context windows of 200K vs 256K, tested across 34 shared challenges. Updated May 2026.
Which is better, Claude Sonnet 4 or Horizon Alpha?
Horizon Alpha is the better choice overall, winning 56% of 26 blind community votes on Rival. Claude Sonnet 4 costs $3/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 Sonnet 4 and Horizon Alpha
Claude Sonnet 4 is made by anthropic while Horizon Alpha is from openrouter. Claude Sonnet 4 has a 200K token context window compared to Horizon Alpha's 256K. On pricing, Claude Sonnet 4 costs $3/M input tokens vs $0/M for Horizon Alpha. In community voting, In 26 community votes, Horizon Alpha wins 56% of head-to-head duels.
In 26 community votes, Horizon Alpha wins 56% of head-to-head duels. Claude Sonnet 4 leads in Reasoning, while Horizon Alpha leads in Web Design, Image Generation, Analysis. Based on blind community voting from the Rival open dataset of 26+ human preference judgments for this pair.
Per 1M tokens
Horizon Alpha has the edge overall. In 26 blind votes, Horizon Alpha wins 56% of the time.
Pick Claude Sonnet 4 for Reasoning. Pick Horizon Alpha for Analysis, Web Design, Image Generation.
Style Comparison
Claude Sonnet 4 uses 503.7x more bold
