Claude Opus 4.1 vs Horizon Alpha
Compare Claude Opus 4.1 by Anthropic against Horizon Alpha by OpenRouter, context windows of 200K vs 256K, tested across 33 shared challenges. Updated May 2026.
Which is better, Claude Opus 4.1 or Horizon Alpha?
Claude Opus 4.1 and Horizon Alpha are both competitive models. Claude Opus 4.1 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 4.1 and Horizon Alpha
Claude Opus 4.1 is made by anthropic while Horizon Alpha is from openrouter. Claude Opus 4.1 has a 200K token context window compared to Horizon Alpha's 256K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $0/M for Horizon Alpha.
Per 1M tokens
No community votes yet. On paper, Claude Opus 4.1 has the edge — bigger model tier, major provider backing.
Style Comparison
Claude Opus 4.1 uses 509.5x more bold
